diff --git a/packages/adapter-base-cache/package.json b/packages/adapter-base-cache/package.json
index b53ee882e..716c25f45 100644
--- a/packages/adapter-base-cache/package.json
+++ b/packages/adapter-base-cache/package.json
@@ -24,7 +24,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "sinon": "17.0.1"
   }
diff --git a/packages/admin-api-schema/package.json b/packages/admin-api-schema/package.json
index 2c19c350f..32435b614 100644
--- a/packages/admin-api-schema/package.json
+++ b/packages/admin-api-schema/package.json
@@ -19,7 +19,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/admin-api/package.json b/packages/admin-api/package.json
index b17165c5c..be81f2baa 100644
--- a/packages/admin-api/package.json
+++ b/packages/admin-api/package.json
@@ -22,7 +22,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/config-url-helpers/package.json b/packages/config-url-helpers/package.json
index 8d517c43f..0e4631fed 100644
--- a/packages/config-url-helpers/package.json
+++ b/packages/config-url-helpers/package.json
@@ -20,7 +20,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/content-api/package.json b/packages/content-api/package.json
index e7c7423c8..30a5bf138 100644
--- a/packages/content-api/package.json
+++ b/packages/content-api/package.json
@@ -34,7 +34,7 @@
     "@babel/polyfill": "7.12.1",
     "@babel/preset-env": "7.23.8",
     "@rollup/plugin-json": "6.1.0",
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "core-js": "3.35.0",
     "eslint-plugin-ghost": "3.4.0",
     "mocha": "10.2.0",
diff --git a/packages/helpers-gatsby/package.json b/packages/helpers-gatsby/package.json
index cf8d252a0..8e288fad7 100644
--- a/packages/helpers-gatsby/package.json
+++ b/packages/helpers-gatsby/package.json
@@ -28,7 +28,7 @@
     "@babel/core": "7.23.7",
     "@babel/preset-env": "7.23.8",
     "@babel/preset-react": "7.23.3",
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "react": "18.2.0",
     "rimraf": "5.0.5",
diff --git a/packages/helpers/package.json b/packages/helpers/package.json
index 03a68684e..e85030e5b 100644
--- a/packages/helpers/package.json
+++ b/packages/helpers/package.json
@@ -33,7 +33,7 @@
   "devDependencies": {
     "@babel/core": "7.23.7",
     "@babel/polyfill": "7.12.1",
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "istanbul": "0.4.5",
     "mocha": "10.2.0",
     "rollup": "2.79.1",
diff --git a/packages/image-transform/package.json b/packages/image-transform/package.json
index a2984640b..c9a84c96e 100644
--- a/packages/image-transform/package.json
+++ b/packages/image-transform/package.json
@@ -19,7 +19,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/limit-service/package.json b/packages/limit-service/package.json
index be016911c..36b257ebb 100644
--- a/packages/limit-service/package.json
+++ b/packages/limit-service/package.json
@@ -20,7 +20,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/schema-org/package.json b/packages/schema-org/package.json
index fdec0c660..74c2f28ab 100644
--- a/packages/schema-org/package.json
+++ b/packages/schema-org/package.json
@@ -22,7 +22,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "istanbul": "0.4.5",
     "mocha": "10.2.0",
     "should": "13.2.3",
diff --git a/packages/social-urls/package.json b/packages/social-urls/package.json
index d83a9ccf1..eb9ed9e6d 100644
--- a/packages/social-urls/package.json
+++ b/packages/social-urls/package.json
@@ -18,7 +18,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
     "sinon": "17.0.1"
diff --git a/packages/string/package.json b/packages/string/package.json
index db5e9b7f2..fd7659f42 100644
--- a/packages/string/package.json
+++ b/packages/string/package.json
@@ -19,7 +19,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "jsdom": "23.2.0",
     "mocha": "10.2.0",
     "should": "13.2.3",
diff --git a/packages/timezone-data/package.json b/packages/timezone-data/package.json
index df2ffaf42..ee3cd760e 100644
--- a/packages/timezone-data/package.json
+++ b/packages/timezone-data/package.json
@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "@rollup/plugin-typescript": "11.1.6",
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "rollup": "2.79.1",
     "rollup-plugin-commonjs": "10.1.0",
diff --git a/packages/url-utils/package.json b/packages/url-utils/package.json
index 574fd227a..260e135cb 100644
--- a/packages/url-utils/package.json
+++ b/packages/url-utils/package.json
@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "@tryghost/config-url-helpers": "^1.0.11",
-    "c8": "9.0.0",
+    "c8": "9.1.0",
     "mocha": "10.2.0",
     "rewire": "7.0.0",
     "should": "13.2.3",
diff --git a/yarn.lock b/yarn.lock
index 45e21357e..d5edf188b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3764,10 +3764,10 @@ byte-size@7.0.0:
   resolved "https://registry.yarnpkg.com/byte-size/-/byte-size-7.0.0.tgz#36528cd1ca87d39bd9abd51f5715dc93b6ceb032"
   integrity sha512-NNiBxKgxybMBtWdmvx7ZITJi4ZG+CYUgwOSZTfqB1qogkRHrhbQE/R2r5Fh94X+InN5MCYz6SvB/ejHMj/HbsQ==
 
-c8@9.0.0:
-  version "9.0.0"
-  resolved "https://registry.yarnpkg.com/c8/-/c8-9.0.0.tgz#96f135754bbfc9fceb3c118970dcfd4a158de59d"
-  integrity sha512-nFJhU2Cz6Frh2awk3IW7wwk3wx27/U2v8ojQCHGc1GWTCHS6aMu4lal327/ZnnYj7oSThGF1X3qUP1yzAJBcOQ==
+c8@9.1.0:
+  version "9.1.0"
+  resolved "https://registry.yarnpkg.com/c8/-/c8-9.1.0.tgz#0e57ba3ab9e5960ab1d650b4a86f71e53cb68112"
+  integrity sha512-mBWcT5iqNir1zIkzSPyI3NCR9EZCVI3WUD+AVO17MVWTSFNyUueXE82qTeampNtTr+ilN/5Ua3j24LgbCKjDVg==
   dependencies:
     "@bcoe/v8-coverage" "^0.2.3"
     "@istanbuljs/schema" "^0.1.3"