diff --git a/poetry.lock b/poetry.lock
index 498e17d..401d968 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1443,32 +1443,28 @@ files = [
 
 [[package]]
 name = "singer-sdk"
-version = "0.38.0"
+version = "0.39.0a1.post29.dev0+078cffdd"
 description = "A framework for building Singer taps"
 optional = false
 python-versions = ">=3.8"
-files = [
-    {file = "singer_sdk-0.38.0-py3-none-any.whl", hash = "sha256:c8be06edae149571df907262ce870dca990dc86a588609dec4ee8404aed3dc01"},
-    {file = "singer_sdk-0.38.0.tar.gz", hash = "sha256:22f13980f9d5d26b98c2654a28e30ddda92d334eade6c50b6a0668be5a8aa55b"},
-]
+files = []
+develop = false
 
 [package.dependencies]
 backoff = {version = ">=2.0.0", markers = "python_version < \"4\""}
 backports-datetime-fromisoformat = {version = ">=2.0.1", markers = "python_version < \"3.11\""}
-click = ">=8.0,<9.0"
-cryptography = ">=3.4.6"
+click = "~=8.0"
 fs = ">=2.4.16"
-importlib-metadata = {version = "<8.0.0", markers = "python_version < \"3.12\""}
-importlib-resources = {version = ">=5.12.0,<6.2.0 || >6.2.0,<6.3.0 || >6.3.0,<6.3.1 || >6.3.1", markers = "python_version < \"3.9\""}
+importlib-metadata = {version = "<9.0.0", markers = "python_version < \"3.12\""}
+importlib-resources = {version = ">=5.12.0,!=6.2.0,!=6.3.0,!=6.3.1", markers = "python_version < \"3.10\""}
 inflection = ">=0.5.1"
 joblib = ">=1.3.0"
 jsonpath-ng = ">=1.5.3"
 jsonschema = ">=4.16.0"
 packaging = ">=23.1"
 pendulum = ">=2.1.0,<4"
-PyJWT = ">=2.4,<3.0"
-pytest = {version = ">=7.2.1", optional = true, markers = "extra == \"docs\" or extra == \"testing\""}
-pytest-durations = {version = ">=1.2.0", optional = true, markers = "extra == \"testing\""}
+pytest = {version = ">=7.2.1", optional = true}
+pytest-durations = {version = ">=1.2.0", optional = true}
 python-dateutil = ">=2.8.2"
 python-dotenv = ">=0.20"
 PyYAML = ">=6.0"
@@ -1481,12 +1477,19 @@ typing-extensions = ">=4.5.0"
 urllib3 = ">=1.26,<2"
 
 [package.extras]
-docs = ["furo (>=2022.12.7)", "myst-parser (>=1)", "pytest (>=7.2.1)", "sphinx (>=4.5)", "sphinx-autobuild (>=2021.3.14)", "sphinx-copybutton (>=0.3.1)", "sphinx-inline-tabs (>=2023.4.21)", "sphinx-notfound-page (>=1.0.0)", "sphinx-reredirects (>=0.1.1)"]
-faker = ["faker (>=22.5,<26.0)"]
+docs = ["furo (>=2024.5.6)", "myst-parser (>=3)", "pytest (>=7.2.1)", "sphinx (>=7)", "sphinx-copybutton (>=0.5.2)", "sphinx-inline-tabs (>=2023.4.21)", "sphinx-notfound-page (>=1.0.0)", "sphinx-reredirects (>=0.1.5)"]
+faker = ["faker (>=22.5,<27.0)"]
+jwt = ["PyJWT (>=2.4,<3.0)", "cryptography (>=3.4.6)"]
 parquet = ["numpy (>=1.22)", "numpy (>=1.22,<1.25)", "pyarrow (>=13)"]
 s3 = ["fs-s3fs (>=1.1.1)"]
 testing = ["pytest (>=7.2.1)", "pytest-durations (>=1.2.0)"]
 
+[package.source]
+type = "git"
+url = "https://github.com/meltano/sdk.git"
+reference = "HEAD"
+resolved_reference = "078cffddfa8ee514ff740fca035ddac03dc37ae8"
+
 [[package]]
 name = "six"
 version = "1.16.0"
@@ -1745,4 +1748,4 @@ test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools",
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8"
-content-hash = "3a0a8ceaab1c913f18a55adbcdf8c1c2193f3ae13c3595992eae80cdbc609596"
+content-hash = "847109928ba0bee51445cbcb66810fdd90102af660c8b401965e94c781de099c"
diff --git a/pyproject.toml b/pyproject.toml
index 3fcf4a8..92861d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ packages = [
 [tool.poetry.dependencies]
 python = ">=3.8"
 cryptography = ">=40,<43"
-singer-sdk = "~=0.38.0"
+singer-sdk = { git = "https://github.com/meltano/sdk.git" }
 snowflake-sqlalchemy = "~=1.6.1"
 snowflake-connector-python = { version = "<4.0.0", extras = ["secure-local-storage"] }
 sqlalchemy = "<2"
@@ -25,7 +25,7 @@ sqlalchemy = "<2"
 coverage = ">=7.2.7"
 pytest = ">=7.4.3"
 pytest-xdist = ">=3.3.1"
-singer-sdk = { version="~=0.38.0", extras = ["testing"] }
+singer-sdk = { git = "https://github.com/meltano/sdk.git", extras = ["testing"] }
 
 [tool.ruff]
 line-length = 120
diff --git a/target_snowflake/sinks.py b/target_snowflake/sinks.py
index fc980fb..4c2313b 100644
--- a/target_snowflake/sinks.py
+++ b/target_snowflake/sinks.py
@@ -21,7 +21,7 @@
 from target_snowflake.connector import SnowflakeConnector
 
 if t.TYPE_CHECKING:
-    from singer_sdk import PluginBase, SQLConnector
+    from singer_sdk import PluginBase
 
 DEFAULT_BATCH_CONFIG = {
     "encoding": {"format": "jsonl", "compression": "gzip"},
@@ -29,7 +29,7 @@
 }
 
 
-class SnowflakeSink(SQLSink):
+class SnowflakeSink(SQLSink[SnowflakeConnector]):
     """Snowflake target sink class."""
 
     connector_class = SnowflakeConnector
@@ -40,7 +40,7 @@ def __init__(
         stream_name: str,
         schema: dict,
         key_properties: list[str] | None,
-        connector: SQLConnector | None = None,
+        connector: SnowflakeConnector | None = None,
     ) -> None:
         """Initialize Snowflake Sink."""
         self.target = target