diff --git a/packages/api-contract/src/Abi/index.ts b/packages/api-contract/src/Abi/index.ts
index 5629d9af1e10..4d033b6d112d 100644
--- a/packages/api-contract/src/Abi/index.ts
+++ b/packages/api-contract/src/Abi/index.ts
@@ -3,7 +3,7 @@
 
 import type { Bytes } from '@polkadot/types';
 import type { ChainProperties, ContractConstructorSpecLatest, ContractEventSpecLatest, ContractMessageParamSpecLatest, ContractMessageSpecLatest, ContractMetadata, ContractMetadataLatest, ContractProjectInfo } from '@polkadot/types/interfaces';
-import type { Codec, Registry } from '@polkadot/types/types';
+import type { Codec, Registry, TypeDef } from '@polkadot/types/types';
 import type { AbiConstructor, AbiEvent, AbiMessage, AbiParam, DecodedEvent, DecodedMessage } from '../types.js';
 
 import { TypeRegistry } from '@polkadot/types';
@@ -82,6 +82,7 @@ export class Abi {
   readonly messages: AbiMessage[];
   readonly metadata: ContractMetadataLatest;
   readonly registry: Registry;
+  readonly environment: Map<string, TypeDef | number> = new Map();
 
   constructor (abiJson: Record<string, unknown> | string, chainProperties?: ChainProperties) {
     [this.json, this.registry, this.metadata, this.info] = parseJson(
@@ -90,11 +91,18 @@ export class Abi {
         : abiJson,
       chainProperties
     );
-    this.constructors = this.metadata.spec.constructors.map((spec: ContractConstructorSpecLatest, index) =>
-      this.#createMessage(spec, index, {
+    this.constructors = this.metadata.spec.constructors.map((spec: ContractConstructorSpecLatest, index) => {
+      const typeSpec = spec.returnType.unwrapOr(null);
+
+      return this.#createMessage(spec, index, {
         isConstructor: true,
-        isPayable: spec.payable.isTrue
-      })
+        isDefault: spec.default.isTrue,
+        isPayable: spec.payable.isTrue,
+        returnType: typeSpec
+          ? this.registry.lookup.getTypeDef(typeSpec.type)
+          : null
+      });
+    }
     );
     this.events = this.metadata.spec.events.map((spec: ContractEventSpecLatest, index) =>
       this.#createEvent(spec, index)
@@ -103,6 +111,7 @@ export class Abi {
       const typeSpec = spec.returnType.unwrapOr(null);
 
       return this.#createMessage(spec, index, {
+        isDefault: spec.default.isTrue,
         isMutating: spec.mutates.isTrue,
         isPayable: spec.payable.isTrue,
         returnType: typeSpec
@@ -110,6 +119,19 @@ export class Abi {
           : null
       });
     });
+    const rawEnv = this.metadata.spec.environment.unwrapOr(null);
+
+    if (rawEnv) {
+      for (const [key, value] of rawEnv.entries()) {
+        const typeSpec = value.toPrimitive();
+
+        if (typeof typeSpec === 'object' && typeSpec !== null && 'type' in typeSpec) {
+          this.environment.set(key, this.registry.lookup.getTypeDef(typeSpec.type as number));
+        } else {
+          this.environment.set(key, typeSpec as number);
+        }
+      }
+    }
   }
 
   /**
@@ -215,6 +237,7 @@ export class Abi {
       }),
       identifier,
       index,
+      isDefault: spec.default.isTrue,
       method: stringCamelCase(identifier),
       path: identifier.split('::').map((s) => stringCamelCase(s)),
       selector: spec.selector,
diff --git a/packages/api-contract/src/Abi/toV4.ts b/packages/api-contract/src/Abi/toV4.ts
index fd6d04ca8668..61bd6a653035 100644
--- a/packages/api-contract/src/Abi/toV4.ts
+++ b/packages/api-contract/src/Abi/toV4.ts
@@ -4,6 +4,17 @@
 import type { ContractMetadataV3, ContractMetadataV4 } from '@polkadot/types/interfaces';
 import type { Registry } from '@polkadot/types/types';
 
-export function v3ToV4 (_registry: Registry, v3: ContractMetadataV3): ContractMetadataV4 {
-  return v3;
+import { objectSpread } from '@polkadot/util';
+
+export function v3ToV4 (registry: Registry, v3: ContractMetadataV3): ContractMetadataV4 {
+  return registry.createType('ContractMetadataV4', objectSpread({}, v3, {
+    spec: objectSpread({}, v3.spec, {
+      constructors: v3.spec.constructors.map((c) =>
+        registry.createType('ContractConstructorSpecV4', objectSpread({}, c))
+      ),
+      messages: v3.spec.messages.map((m) =>
+        registry.createType('ContractMessageSpecV3', objectSpread({}, m))
+      )
+    })
+  }));
 }
diff --git a/packages/api-contract/src/test/compare/ink_v4_flipperContract.test.json b/packages/api-contract/src/test/compare/ink_v4_flipperContract.test.json
index e7e9211fa21f..09a25452177a 100644
--- a/packages/api-contract/src/test/compare/ink_v4_flipperContract.test.json
+++ b/packages/api-contract/src/test/compare/ink_v4_flipperContract.test.json
@@ -5,5 +5,151 @@
     "type": "bool",
     "docs": [],
     "namespace": ""
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 1,
+    "type": "Result<Null, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Null",
+    "lookupIndex": 2,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 4,
+    "type": "Result<bool, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 6,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 7,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 8,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 9,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 10,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 11,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
   }
 ]
\ No newline at end of file
diff --git a/packages/api-contract/src/test/compare/ink_v4_flipperMetadata.test.json b/packages/api-contract/src/test/compare/ink_v4_flipperMetadata.test.json
index e7e9211fa21f..09a25452177a 100644
--- a/packages/api-contract/src/test/compare/ink_v4_flipperMetadata.test.json
+++ b/packages/api-contract/src/test/compare/ink_v4_flipperMetadata.test.json
@@ -5,5 +5,151 @@
     "type": "bool",
     "docs": [],
     "namespace": ""
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 1,
+    "type": "Result<Null, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Null",
+        "lookupIndex": 2,
+        "type": "Null",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Null",
+    "lookupIndex": 2,
+    "type": "Null",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Enum",
+    "lookupIndex": 3,
+    "lookupName": "InkPrimitivesLangError",
+    "type": "{\"_enum\":[\"__Unused0\",\"CouldNotReadInput\"]}",
+    "docs": [],
+    "namespace": "ink_primitives::LangError",
+    "sub": [
+      {
+        "index": 0,
+        "info": "Null",
+        "name": "__Unused0",
+        "type": "Null"
+      },
+      {
+        "info": "Null",
+        "type": "Null",
+        "index": 1,
+        "name": "CouldNotReadInput"
+      }
+    ]
+  },
+  {
+    "info": "Result",
+    "lookupIndex": 4,
+    "type": "Result<bool, InkPrimitivesLangError>",
+    "docs": [],
+    "namespace": "Result",
+    "sub": [
+      {
+        "name": "Ok",
+        "info": "Plain",
+        "lookupIndex": 0,
+        "type": "bool",
+        "docs": [],
+        "namespace": ""
+      },
+      {
+        "name": "Error",
+        "docs": [],
+        "info": "Si",
+        "lookupIndex": 3,
+        "lookupName": "InkPrimitivesLangError",
+        "type": "Lookup3"
+      }
+    ]
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 5,
+    "type": "AccountId",
+    "docs": [],
+    "namespace": "ink_primitives::types::AccountId",
+    "lookupNameRoot": "InkPrimitivesAccountId"
+  },
+  {
+    "info": "VecFixed",
+    "lookupIndex": 6,
+    "type": "[u8;32]",
+    "docs": [],
+    "namespace": "",
+    "length": 32,
+    "sub": {
+      "info": "Plain",
+      "lookupIndex": 7,
+      "type": "u8",
+      "docs": [],
+      "namespace": ""
+    }
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 7,
+    "type": "u8",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 8,
+    "type": "u128",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 9,
+    "type": "Hash",
+    "docs": [],
+    "namespace": "ink_primitives::types::Hash",
+    "lookupNameRoot": "InkPrimitivesHash"
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 10,
+    "type": "u64",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 11,
+    "type": "u32",
+    "docs": [],
+    "namespace": ""
+  },
+  {
+    "info": "Plain",
+    "lookupIndex": 12,
+    "type": "NoChainExtension",
+    "docs": [],
+    "namespace": "ink_env::types::NoChainExtension",
+    "lookupNameRoot": "InkEnvNoChainExtension"
   }
 ]
\ No newline at end of file
diff --git a/packages/api-contract/src/test/contracts/ink/v4/flipper.contract.json b/packages/api-contract/src/test/contracts/ink/v4/flipper.contract.json
index a00fe3ac47a8..d796e45694da 100644
--- a/packages/api-contract/src/test/contracts/ink/v4/flipper.contract.json
+++ b/packages/api-contract/src/test/contracts/ink/v4/flipper.contract.json
@@ -1,104 +1 @@
-{
-  "source": {
-    "hash": "0xf051c631190ac47f82e280ba763df932210f6e2447978e24cbe0dcc6d6903c7a",
-    "language": "ink! 4.0.0-alpha.1",
-    "compiler": "rustc 1.63.0",
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-  },
-  "contract": {
-    "name": "flipper",
-    "version": "4.0.0-alpha.1",
-    "authors": [
-      "Parity Technologies <admin@parity.io>"
-    ]
-  },
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-      {
-        "args": [
-          {
-            "label": "init_value",
-            "type": {
-              "displayName": [
-                "bool"
-              ],
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-            }
-          }
-        ],
-        "docs": [
-          "Creates a new flipper smart contract initialized with the given value."
-        ],
-        "label": "new",
-        "payable": false,
-        "selector": "0x9bae9d5e"
-      },
-      {
-        "args": [],
-        "docs": [
-          "Creates a new flipper smart contract initialized to `false`."
-        ],
-        "label": "default",
-        "payable": false,
-        "selector": "0xed4b9d1b"
-      }
-    ],
-    "docs": [],
-    "events": [],
-    "messages": [
-      {
-        "args": [],
-        "docs": [
-          " Flips the current value of the Flipper's boolean."
-        ],
-        "label": "flip",
-        "mutates": true,
-        "payable": false,
-        "returnType": null,
-        "selector": "0x633aa551"
-      },
-      {
-        "args": [],
-        "docs": [
-          " Returns the current value of the Flipper's boolean."
-        ],
-        "label": "get",
-        "mutates": false,
-        "payable": false,
-        "returnType": {
-          "displayName": [
-            "bool"
-          ],
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-        "selector": "0x2f865bd9"
-      }
-    ]
-  },
-  "storage": {
-    "struct": {
-      "fields": [
-        {
-          "layout": {
-            "cell": {
-              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
-              "ty": 0
-            }
-          },
-          "name": "value"
-        }
-      ]
-    }
-  },
-  "types": [
-    {
-      "id": 0,
-      "type": {
-        "def": {
-          "primitive": "bool"
-        }
-      }
-    }
-  ],
-  "version": "4"
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Technologies <admin@parity.io>"]},"spec":{"constructors":[{"args":[{"label":"init_value","type":{"displayName":["bool"],"type":0}}],"default":false,"docs":["Creates a new flipper smart contract initialized with the given value."],"label":"new","payable":false,"returnType":{"displayName":["ink_primitives","ConstructorResult"],"type":1},"selector":"0x9bae9d5e"},{"args":[],"default":false,"docs":["Creates a new flipper smart contract initialized to `false`."],"label":"new_default","payable":false,"returnType":{"displayName":["ink_primitives","ConstructorResult"],"type":1},"selector":"0x61ef7e3e"}],"docs":[],"environment":{"accountId":{"displayName":["AccountId"],"type":5},"balance":{"displayName":["Balance"],"type":8},"blockNumber":{"displayName":["BlockNumber"],"type":11},"chainExtension":{"displayName":["ChainExtension"],"type":12},"hash":{"displayName":["Hash"],"type":9},"maxEventTopics":4,"timestamp":{"displayName":["Timestamp"],"type":10}},"events":[],"lang_error":{"displayName":["ink","LangError"],"type":3},"messages":[{"args":[],"default":false,"docs":[" Flips the current value of the Flipper's boolean."],"label":"flip","mutates":true,"payable":false,"returnType":{"displayName":["ink","MessageResult"],"type":1},"selector":"0x633aa551"},{"args":[],"default":false,"docs":[" Returns the current value of the Flipper's boolean."],"label":"get","mutates":false,"payable":false,"returnType":{"displayName":["ink","MessageResult"],"type":4},"selector":"0x2f865bd9"}]},"storage":{"root":{"layout":{"struct":{"fields":[{"layout":{"leaf":{"key":"0x00000000","ty":0}},"name":"value"}],"name":"Flipper"}},"root_key":"0x00000000"}},"types":[{"id":0,"type":{"def":{"primitive":"bool"}}},{"id":1,"type":{"def":{"variant":{"variants":[{"fields":[{"type":2}],"index":0,"name":"Ok"},{"fields":[{"type":3}],"index":1,"name":"Err"}]}},"params":[{"name":"T","type":2},{"name":"E","type":3}],"path":["Result"]}},{"id":2,"type":{"def":{"tuple":[]}}},{"id":3,"type":{"def":{"variant":{"variants":[{"index":1,"name":"CouldNotReadInput"}]}},"path":["ink_primitives","LangError"]}},{"id":4,"type":{"def":{"variant":{"variants":[{"fields":[{"type":0}],"index":0,"name":"Ok"},{"fields":[{"type":3}],"index":1,"name":"Err"}]}},"params":[{"name":"T","type":0},{"name":"E","type":3}],"path":["Result"]}},{"id":5,"type":{"def":{"composite":{"fields":[{"type":6,"typeName":"[u8; 32]"}]}},"path":["ink_primitives","types","AccountId"]}},{"id":6,"type":{"def":{"array":{"len":32,"type":7}}}},{"id":7,"type":{"def":{"primitive":"u8"}}},{"id":8,"type":{"def":{"primitive":"u128"}}},{"id":9,"type":{"def":{"composite":{"fields":[{"type":6,"typeName":"[u8; 32]"}]}},"path":["ink_primitives","types","Hash"]}},{"id":10,"type":{"def":{"primitive":"u64"}}},{"id":11,"type":{"def":{"primitive":"u32"}}},{"id":12,"type":{"def":{"variant":{}},"path":["ink_env","types","NoChainExtension"]}}],"version":"4"}
\ No newline at end of file
diff --git a/packages/api-contract/src/test/contracts/ink/v4/flipper.json b/packages/api-contract/src/test/contracts/ink/v4/flipper.json
index e3cbe9bf7d76..d2232d656eda 100644
--- a/packages/api-contract/src/test/contracts/ink/v4/flipper.json
+++ b/packages/api-contract/src/test/contracts/ink/v4/flipper.json
@@ -1,12 +1,21 @@
 {
   "source": {
-    "hash": "0xf051c631190ac47f82e280ba763df932210f6e2447978e24cbe0dcc6d6903c7a",
-    "language": "ink! 4.0.0-alpha.1",
-    "compiler": "rustc 1.63.0"
+    "hash": "0xa5b19cb655755feba8e34ab5b413ac6593ecc7e24e19af485a4d30036be9d577",
+    "language": "ink! 4.2.0",
+    "compiler": "rustc 1.69.0",
+    "build_info": {
+      "build_mode": "Debug",
+      "cargo_contract_version": "2.2.1",
+      "rust_toolchain": "stable-x86_64-apple-darwin",
+      "wasm_opt_settings": {
+        "keep_debug_symbols": false,
+        "optimization_passes": "Z"
+      }
+    }
   },
   "contract": {
     "name": "flipper",
-    "version": "4.0.0-alpha.1",
+    "version": "4.2.0",
     "authors": [
       "Parity Technologies <admin@parity.io>"
     ]
@@ -25,39 +34,109 @@
             }
           }
         ],
+        "default": false,
         "docs": [
           "Creates a new flipper smart contract initialized with the given value."
         ],
         "label": "new",
         "payable": false,
+        "returnType": {
+          "displayName": [
+            "ink_primitives",
+            "ConstructorResult"
+          ],
+          "type": 1
+        },
         "selector": "0x9bae9d5e"
       },
       {
         "args": [],
+        "default": false,
         "docs": [
           "Creates a new flipper smart contract initialized to `false`."
         ],
-        "label": "default",
+        "label": "new_default",
         "payable": false,
-        "selector": "0xed4b9d1b"
+        "returnType": {
+          "displayName": [
+            "ink_primitives",
+            "ConstructorResult"
+          ],
+          "type": 1
+        },
+        "selector": "0x61ef7e3e"
       }
     ],
     "docs": [],
+    "environment": {
+      "accountId": {
+        "displayName": [
+          "AccountId"
+        ],
+        "type": 5
+      },
+      "balance": {
+        "displayName": [
+          "Balance"
+        ],
+        "type": 8
+      },
+      "blockNumber": {
+        "displayName": [
+          "BlockNumber"
+        ],
+        "type": 11
+      },
+      "chainExtension": {
+        "displayName": [
+          "ChainExtension"
+        ],
+        "type": 12
+      },
+      "hash": {
+        "displayName": [
+          "Hash"
+        ],
+        "type": 9
+      },
+      "maxEventTopics": 4,
+      "timestamp": {
+        "displayName": [
+          "Timestamp"
+        ],
+        "type": 10
+      }
+    },
     "events": [],
+    "lang_error": {
+      "displayName": [
+        "ink",
+        "LangError"
+      ],
+      "type": 3
+    },
     "messages": [
       {
         "args": [],
+        "default": false,
         "docs": [
           " Flips the current value of the Flipper's boolean."
         ],
         "label": "flip",
         "mutates": true,
         "payable": false,
-        "returnType": null,
+        "returnType": {
+          "displayName": [
+            "ink",
+            "MessageResult"
+          ],
+          "type": 1
+        },
         "selector": "0x633aa551"
       },
       {
         "args": [],
+        "default": false,
         "docs": [
           " Returns the current value of the Flipper's boolean."
         ],
@@ -66,27 +145,34 @@
         "payable": false,
         "returnType": {
           "displayName": [
-            "bool"
+            "ink",
+            "MessageResult"
           ],
-          "type": 0
+          "type": 4
         },
         "selector": "0x2f865bd9"
       }
     ]
   },
   "storage": {
-    "struct": {
-      "fields": [
-        {
-          "layout": {
-            "cell": {
-              "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
-              "ty": 0
+    "root": {
+      "layout": {
+        "struct": {
+          "fields": [
+            {
+              "layout": {
+                "leaf": {
+                  "key": "0x00000000",
+                  "ty": 0
+                }
+              },
+              "name": "value"
             }
-          },
-          "name": "value"
+          ],
+          "name": "Flipper"
         }
-      ]
+      },
+      "root_key": "0x00000000"
     }
   },
   "types": [
@@ -97,6 +183,213 @@
           "primitive": "bool"
         }
       }
+    },
+    {
+      "id": 1,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 2
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 2
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 2,
+      "type": {
+        "def": {
+          "tuple": []
+        }
+      }
+    },
+    {
+      "id": 3,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "index": 1,
+                "name": "CouldNotReadInput"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "LangError"
+        ]
+      }
+    },
+    {
+      "id": 4,
+      "type": {
+        "def": {
+          "variant": {
+            "variants": [
+              {
+                "fields": [
+                  {
+                    "type": 0
+                  }
+                ],
+                "index": 0,
+                "name": "Ok"
+              },
+              {
+                "fields": [
+                  {
+                    "type": 3
+                  }
+                ],
+                "index": 1,
+                "name": "Err"
+              }
+            ]
+          }
+        },
+        "params": [
+          {
+            "name": "T",
+            "type": 0
+          },
+          {
+            "name": "E",
+            "type": 3
+          }
+        ],
+        "path": [
+          "Result"
+        ]
+      }
+    },
+    {
+      "id": 5,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "AccountId"
+        ]
+      }
+    },
+    {
+      "id": 6,
+      "type": {
+        "def": {
+          "array": {
+            "len": 32,
+            "type": 7
+          }
+        }
+      }
+    },
+    {
+      "id": 7,
+      "type": {
+        "def": {
+          "primitive": "u8"
+        }
+      }
+    },
+    {
+      "id": 8,
+      "type": {
+        "def": {
+          "primitive": "u128"
+        }
+      }
+    },
+    {
+      "id": 9,
+      "type": {
+        "def": {
+          "composite": {
+            "fields": [
+              {
+                "type": 6,
+                "typeName": "[u8; 32]"
+              }
+            ]
+          }
+        },
+        "path": [
+          "ink_primitives",
+          "types",
+          "Hash"
+        ]
+      }
+    },
+    {
+      "id": 10,
+      "type": {
+        "def": {
+          "primitive": "u64"
+        }
+      }
+    },
+    {
+      "id": 11,
+      "type": {
+        "def": {
+          "primitive": "u32"
+        }
+      }
+    },
+    {
+      "id": 12,
+      "type": {
+        "def": {
+          "variant": {}
+        },
+        "path": [
+          "ink_env",
+          "types",
+          "NoChainExtension"
+        ]
+      }
     }
   ],
   "version": "4"
diff --git a/packages/api-contract/src/test/contracts/ink/v4/flipper.wasm b/packages/api-contract/src/test/contracts/ink/v4/flipper.wasm
index 625c7b1667a0..3f77edb2319a 100644
Binary files a/packages/api-contract/src/test/contracts/ink/v4/flipper.wasm and b/packages/api-contract/src/test/contracts/ink/v4/flipper.wasm differ
diff --git a/packages/api-contract/src/types.ts b/packages/api-contract/src/types.ts
index 25d2a4392777..049dc11103a9 100644
--- a/packages/api-contract/src/types.ts
+++ b/packages/api-contract/src/types.ts
@@ -37,6 +37,7 @@ export interface AbiMessage {
   identifier: string;
   index: number;
   isConstructor?: boolean;
+  isDefault?: boolean;
   isMutating?: boolean;
   isPayable?: boolean;
   method: string;
diff --git a/packages/types-augment/src/registry/interfaces.ts b/packages/types-augment/src/registry/interfaces.ts
index 762a89c48b51..e5937950e0a7 100644
--- a/packages/types-augment/src/registry/interfaces.ts
+++ b/packages/types-augment/src/registry/interfaces.ts
@@ -24,7 +24,7 @@ import type { StatementKind } from '@polkadot/types/interfaces/claims';
 import type { CollectiveOrigin, MemberCount, ProposalIndex, Votes, VotesTo230 } from '@polkadot/types/interfaces/collective';
 import type { AuthorityId, RawVRFOutput } from '@polkadot/types/interfaces/consensus';
 import type { AliveContractInfo, CodeHash, CodeSource, CodeUploadRequest, CodeUploadResult, CodeUploadResultValue, ContractCallFlags, ContractCallRequest, ContractExecResult, ContractExecResultOk, ContractExecResultResult, ContractExecResultSuccessTo255, ContractExecResultSuccessTo260, ContractExecResultTo255, ContractExecResultTo260, ContractExecResultTo267, ContractExecResultU64, ContractInfo, ContractInstantiateResult, ContractInstantiateResultTo267, ContractInstantiateResultTo299, ContractInstantiateResultU64, ContractReturnFlags, ContractStorageKey, DeletedContract, ExecReturnValue, Gas, HostFnWeights, HostFnWeightsTo264, InstantiateRequest, InstantiateRequestV1, InstantiateRequestV2, InstantiateReturnValue, InstantiateReturnValueOk, InstantiateReturnValueTo267, InstructionWeights, Limits, LimitsTo264, PrefabWasmModule, RentProjection, Schedule, ScheduleTo212, ScheduleTo258, ScheduleTo264, SeedOf, StorageDeposit, TombstoneContractInfo, TrieId } from '@polkadot/types/interfaces/contracts';
-import type { ContractConstructorSpecLatest, ContractConstructorSpecV0, ContractConstructorSpecV1, ContractConstructorSpecV2, ContractConstructorSpecV3, ContractContractSpecV0, ContractContractSpecV1, ContractContractSpecV2, ContractContractSpecV3, ContractContractSpecV4, ContractCryptoHasher, ContractDiscriminant, ContractDisplayName, ContractEventParamSpecLatest, ContractEventParamSpecV0, ContractEventParamSpecV2, ContractEventSpecLatest, ContractEventSpecV0, ContractEventSpecV1, ContractEventSpecV2, ContractLayoutArray, ContractLayoutCell, ContractLayoutEnum, ContractLayoutHash, ContractLayoutHashingStrategy, ContractLayoutKey, ContractLayoutStruct, ContractLayoutStructField, ContractMessageParamSpecLatest, ContractMessageParamSpecV0, ContractMessageParamSpecV2, ContractMessageSpecLatest, ContractMessageSpecV0, ContractMessageSpecV1, ContractMessageSpecV2, ContractMetadata, ContractMetadataLatest, ContractMetadataV0, ContractMetadataV1, ContractMetadataV2, ContractMetadataV3, ContractMetadataV4, ContractProject, ContractProjectContract, ContractProjectInfo, ContractProjectSource, ContractProjectV0, ContractSelector, ContractStorageLayout, ContractTypeSpec } from '@polkadot/types/interfaces/contractsAbi';
+import type { ContractConstructorSpecLatest, ContractConstructorSpecV0, ContractConstructorSpecV1, ContractConstructorSpecV2, ContractConstructorSpecV3, ContractConstructorSpecV4, ContractContractSpecV0, ContractContractSpecV1, ContractContractSpecV2, ContractContractSpecV3, ContractContractSpecV4, ContractCryptoHasher, ContractDiscriminant, ContractDisplayName, ContractEnvironment, ContractEventParamSpecLatest, ContractEventParamSpecV0, ContractEventParamSpecV2, ContractEventSpecLatest, ContractEventSpecV0, ContractEventSpecV1, ContractEventSpecV2, ContractLayoutArray, ContractLayoutCell, ContractLayoutEnum, ContractLayoutHash, ContractLayoutHashingStrategy, ContractLayoutKey, ContractLayoutStruct, ContractLayoutStructField, ContractMessageParamSpecLatest, ContractMessageParamSpecV0, ContractMessageParamSpecV2, ContractMessageSpecLatest, ContractMessageSpecV0, ContractMessageSpecV1, ContractMessageSpecV2, ContractMessageSpecV3, ContractMetadata, ContractMetadataLatest, ContractMetadataV0, ContractMetadataV1, ContractMetadataV2, ContractMetadataV3, ContractMetadataV4, ContractProject, ContractProjectContract, ContractProjectInfo, ContractProjectSource, ContractProjectV0, ContractSelector, ContractStorageLayout, ContractTypeSpec } from '@polkadot/types/interfaces/contractsAbi';
 import type { FundIndex, FundInfo, LastContribution, TrieIndex } from '@polkadot/types/interfaces/crowdloan';
 import type { CollationInfo, CollationInfoV1, ConfigData, MessageId, OverweightIndex, PageCounter, PageIndexData } from '@polkadot/types/interfaces/cumulus';
 import type { AccountVote, AccountVoteSplit, AccountVoteStandard, Conviction, Delegations, PreimageStatus, PreimageStatusAvailable, PriorLock, PropIndex, Proposal, ProxyState, ReferendumIndex, ReferendumInfo, ReferendumInfoFinished, ReferendumInfoTo239, ReferendumStatus, Tally, Voting, VotingDelegating, VotingDirect, VotingDirectVote } from '@polkadot/types/interfaces/democracy';
@@ -253,6 +253,7 @@ declare module '@polkadot/types/types/registry' {
     ContractConstructorSpecV1: ContractConstructorSpecV1;
     ContractConstructorSpecV2: ContractConstructorSpecV2;
     ContractConstructorSpecV3: ContractConstructorSpecV3;
+    ContractConstructorSpecV4: ContractConstructorSpecV4;
     ContractContractSpecV0: ContractContractSpecV0;
     ContractContractSpecV1: ContractContractSpecV1;
     ContractContractSpecV2: ContractContractSpecV2;
@@ -261,6 +262,7 @@ declare module '@polkadot/types/types/registry' {
     ContractCryptoHasher: ContractCryptoHasher;
     ContractDiscriminant: ContractDiscriminant;
     ContractDisplayName: ContractDisplayName;
+    ContractEnvironment: ContractEnvironment;
     ContractEventParamSpecLatest: ContractEventParamSpecLatest;
     ContractEventParamSpecV0: ContractEventParamSpecV0;
     ContractEventParamSpecV2: ContractEventParamSpecV2;
@@ -297,6 +299,7 @@ declare module '@polkadot/types/types/registry' {
     ContractMessageSpecV0: ContractMessageSpecV0;
     ContractMessageSpecV1: ContractMessageSpecV1;
     ContractMessageSpecV2: ContractMessageSpecV2;
+    ContractMessageSpecV3: ContractMessageSpecV3;
     ContractMetadata: ContractMetadata;
     ContractMetadataLatest: ContractMetadataLatest;
     ContractMetadataV0: ContractMetadataV0;
diff --git a/packages/types/src/interfaces/contractsAbi/definitions.ts b/packages/types/src/interfaces/contractsAbi/definitions.ts
index db62ccdbbfdd..6530548b9670 100644
--- a/packages/types/src/interfaces/contractsAbi/definitions.ts
+++ b/packages/types/src/interfaces/contractsAbi/definitions.ts
@@ -80,6 +80,15 @@ const spec = {
     args: 'Vec<ContractMessageParamSpecV2>',
     docs: 'Vec<Text>'
   },
+  ContractConstructorSpecV4: {
+    label: 'Text',
+    selector: 'ContractSelector',
+    payable: 'bool',
+    args: 'Vec<ContractMessageParamSpecV2>',
+    docs: 'Vec<Text>',
+    default: 'bool',
+    returnType: 'Option<ContractTypeSpec>'
+  },
   ContractContractSpecV0: {
     constructors: 'Vec<ContractConstructorSpecV0>',
     messages: 'Vec<ContractMessageSpecV0>',
@@ -104,7 +113,14 @@ const spec = {
     events: 'Vec<ContractEventSpecV2>',
     docs: 'Vec<Text>'
   },
-  ContractContractSpecV4: 'ContractContractSpecV3',
+  ContractContractSpecV4: {
+    constructors: 'Vec<ContractConstructorSpecV4>',
+    messages: 'Vec<ContractMessageSpecV3>',
+    events: 'Vec<ContractEventSpecV2>',
+    docs: 'Vec<Text>',
+    environment: 'Option<ContractEnvironment>'
+  },
+
   ContractDisplayName: 'SiPath',
   ContractEventParamSpecV0: {
     name: 'Text',
@@ -168,6 +184,16 @@ const spec = {
     returnType: 'Option<ContractTypeSpec>',
     docs: 'Vec<Text>'
   },
+  ContractMessageSpecV3: {
+    label: 'Text',
+    selector: 'ContractSelector',
+    mutates: 'bool',
+    payable: 'bool',
+    args: 'Vec<ContractMessageParamSpecV2>',
+    returnType: 'Option<ContractTypeSpec>',
+    docs: 'Vec<Text>',
+    default: 'bool'
+  },
   ContractSelector: '[u8; 4]',
   ContractTypeSpec: {
     type: 'SiLookupTypeId',
@@ -176,11 +202,11 @@ const spec = {
 };
 
 const latest = {
-  ContractConstructorSpecLatest: 'ContractConstructorSpecV3',
+  ContractConstructorSpecLatest: 'ContractConstructorSpecV4',
   ContractEventSpecLatest: 'ContractEventSpecV2',
   ContractEventParamSpecLatest: 'ContractEventParamSpecV2',
   ContractMessageParamSpecLatest: 'ContractMessageParamSpecV2',
-  ContractMessageSpecLatest: 'ContractMessageSpecV2',
+  ContractMessageSpecLatest: 'ContractMessageSpecV3',
   ContractMetadataLatest: 'ContractMetadataV4'
 };
 
@@ -211,7 +237,10 @@ export default {
       types: 'Vec<PortableType>',
       spec: 'ContractContractSpecV3'
     },
-    ContractMetadataV4: 'ContractMetadataV3',
+    ContractMetadataV4: {
+      types: 'Vec<PortableType>',
+      spec: 'ContractContractSpecV4'
+    },
     ContractMetadata: {
       _enum: {
         V0: 'ContractMetadataV0',
@@ -250,6 +279,17 @@ export default {
       language: 'Text',
       compiler: 'Text',
       wasm: 'Raw'
+    },
+    ContractEnvironment: {
+      _alias: {
+        hashType: 'hash'
+      },
+      accountId: 'ContractTypeSpec',
+      balance: 'ContractTypeSpec',
+      blockNumber: 'ContractTypeSpec',
+      hashType: 'ContractTypeSpec',
+      timestamp: 'ContractTypeSpec',
+      maxEventTopics: 'u32'
     }
   }
 } as Definitions;
diff --git a/packages/types/src/interfaces/contractsAbi/types.ts b/packages/types/src/interfaces/contractsAbi/types.ts
index f12a2f0c82d3..d3bf6d86002d 100644
--- a/packages/types/src/interfaces/contractsAbi/types.ts
+++ b/packages/types/src/interfaces/contractsAbi/types.ts
@@ -7,7 +7,7 @@ import type { PortableType } from '@polkadot/types/interfaces/metadata';
 import type { Si0Type, SiLookupTypeId, SiPath } from '@polkadot/types/interfaces/scaleInfo';
 
 /** @name ContractConstructorSpecLatest */
-export interface ContractConstructorSpecLatest extends ContractConstructorSpecV3 {}
+export interface ContractConstructorSpecLatest extends ContractConstructorSpecV4 {}
 
 /** @name ContractConstructorSpecV0 */
 export interface ContractConstructorSpecV0 extends Struct {
@@ -42,6 +42,17 @@ export interface ContractConstructorSpecV3 extends Struct {
   readonly docs: Vec<Text>;
 }
 
+/** @name ContractConstructorSpecV4 */
+export interface ContractConstructorSpecV4 extends Struct {
+  readonly label: Text;
+  readonly selector: ContractSelector;
+  readonly payable: bool;
+  readonly args: Vec<ContractMessageParamSpecV2>;
+  readonly docs: Vec<Text>;
+  readonly default: bool;
+  readonly returnType: Option<ContractTypeSpec>;
+}
+
 /** @name ContractContractSpecV0 */
 export interface ContractContractSpecV0 extends Struct {
   readonly constructors: Vec<ContractConstructorSpecV0>;
@@ -75,7 +86,13 @@ export interface ContractContractSpecV3 extends Struct {
 }
 
 /** @name ContractContractSpecV4 */
-export interface ContractContractSpecV4 extends ContractContractSpecV3 {}
+export interface ContractContractSpecV4 extends Struct {
+  readonly constructors: Vec<ContractConstructorSpecV4>;
+  readonly messages: Vec<ContractMessageSpecV3>;
+  readonly events: Vec<ContractEventSpecV2>;
+  readonly docs: Vec<Text>;
+  readonly environment: Option<ContractEnvironment>;
+}
 
 /** @name ContractCryptoHasher */
 export interface ContractCryptoHasher extends Enum {
@@ -91,6 +108,16 @@ export interface ContractDiscriminant extends u32 {}
 /** @name ContractDisplayName */
 export interface ContractDisplayName extends SiPath {}
 
+/** @name ContractEnvironment */
+export interface ContractEnvironment extends Struct {
+  readonly accountId: ContractTypeSpec;
+  readonly balance: ContractTypeSpec;
+  readonly blockNumber: ContractTypeSpec;
+  readonly hashType: ContractTypeSpec;
+  readonly timestamp: ContractTypeSpec;
+  readonly maxEventTopics: u32;
+}
+
 /** @name ContractEventParamSpecLatest */
 export interface ContractEventParamSpecLatest extends ContractEventParamSpecV2 {}
 
@@ -198,7 +225,7 @@ export interface ContractMessageParamSpecV2 extends Struct {
 }
 
 /** @name ContractMessageSpecLatest */
-export interface ContractMessageSpecLatest extends ContractMessageSpecV2 {}
+export interface ContractMessageSpecLatest extends ContractMessageSpecV3 {}
 
 /** @name ContractMessageSpecV0 */
 export interface ContractMessageSpecV0 extends Struct {
@@ -233,6 +260,18 @@ export interface ContractMessageSpecV2 extends Struct {
   readonly docs: Vec<Text>;
 }
 
+/** @name ContractMessageSpecV3 */
+export interface ContractMessageSpecV3 extends Struct {
+  readonly label: Text;
+  readonly selector: ContractSelector;
+  readonly mutates: bool;
+  readonly payable: bool;
+  readonly args: Vec<ContractMessageParamSpecV2>;
+  readonly returnType: Option<ContractTypeSpec>;
+  readonly docs: Vec<Text>;
+  readonly default: bool;
+}
+
 /** @name ContractMetadata */
 export interface ContractMetadata extends Enum {
   readonly isV0: boolean;
@@ -277,7 +316,10 @@ export interface ContractMetadataV3 extends Struct {
 }
 
 /** @name ContractMetadataV4 */
-export interface ContractMetadataV4 extends ContractMetadataV3 {}
+export interface ContractMetadataV4 extends Struct {
+  readonly types: Vec<PortableType>;
+  readonly spec: ContractContractSpecV4;
+}
 
 /** @name ContractProject */
 export interface ContractProject extends ITuple<[ContractProjectInfo, ContractMetadata]> {}