diff --git a/examples/codegen-gql-files/package.json b/examples/codegen-gql-files/package.json
index a6caca14..6defd2c1 100644
--- a/examples/codegen-gql-files/package.json
+++ b/examples/codegen-gql-files/package.json
@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "@graphql-tools/load-files": "^7.0.0",
-    "fastify": "^5.0.0",
+    "fastify": "^5.1.0",
     "graphql": "^16.9.0",
     "mercurius": "^15.1.0",
     "mercurius-codegen": "workspace:*"
diff --git a/examples/codegen/package.json b/examples/codegen/package.json
index bea6547e..882511c4 100644
--- a/examples/codegen/package.json
+++ b/examples/codegen/package.json
@@ -15,7 +15,7 @@
     "test": "cross-env NODE_ENV=test tap --node-arg=--require=bob-tsm"
   },
   "dependencies": {
-    "fastify": "^5.0.0",
+    "fastify": "^5.1.0",
     "graphql": "^16.9.0",
     "mercurius": "^15.1.0",
     "mercurius-codegen": "workspace:*"
diff --git a/examples/manual/package.json b/examples/manual/package.json
index 8cf02eae..4d95d245 100644
--- a/examples/manual/package.json
+++ b/examples/manual/package.json
@@ -12,7 +12,7 @@
     "test": "cross-env NODE_ENV=test tap --node-arg=--require=bob-tsm"
   },
   "dependencies": {
-    "fastify": "^5.0.0",
+    "fastify": "^5.1.0",
     "graphql": "^16.9.0",
     "mercurius": "^15.1.0"
   },
diff --git a/packages/mercurius-codegen/package.json b/packages/mercurius-codegen/package.json
index 40480e9a..9cb746f8 100644
--- a/packages/mercurius-codegen/package.json
+++ b/packages/mercurius-codegen/package.json
@@ -56,7 +56,7 @@
     "changesets-github-release": "^0.1.0",
     "concurrently": "^9.0.1",
     "cross-env": "^7.0.3",
-    "fastify": "^5.0.0",
+    "fastify": "^5.1.0",
     "graphql": "^16.9.0",
     "mercurius": "^15.1.0",
     "mercurius-codegen": "workspace:*",
@@ -73,7 +73,7 @@
     "wait-on": "^8.0.1"
   },
   "peerDependencies": {
-    "fastify": "^5.0.0",
+    "fastify": "^5.1.0",
     "graphql": "*",
     "mercurius": "^11.0.0 || ^12.0.0 || ^13.0.0 || ^14.0.0 || ^15.0.0",
     "prettier": "^3.3.3"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2593d9e2..6cebf4e8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -36,8 +36,8 @@ importers:
   examples/codegen:
     dependencies:
       fastify:
-        specifier: ^5.0.0
-        version: 5.0.0
+        specifier: ^5.1.0
+        version: 5.1.0
       graphql:
         specifier: ^16.9.0
         version: 16.9.0
@@ -68,7 +68,7 @@ importers:
         version: 0.24.0
       mercurius-integration-testing:
         specifier: ^9.0.0
-        version: 9.0.0(fastify@5.0.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
+        version: 9.0.0(fastify@5.1.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
       prettier:
         specifier: ^3.3.3
         version: 3.3.3
@@ -85,8 +85,8 @@ importers:
         specifier: ^7.0.0
         version: 7.0.0(graphql@16.9.0)
       fastify:
-        specifier: ^5.0.0
-        version: 5.0.0
+        specifier: ^5.1.0
+        version: 5.1.0
       graphql:
         specifier: ^16.9.0
         version: 16.9.0
@@ -117,7 +117,7 @@ importers:
         version: 0.24.0
       mercurius-integration-testing:
         specifier: ^9.0.0
-        version: 9.0.0(fastify@5.0.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
+        version: 9.0.0(fastify@5.1.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
       prettier:
         specifier: ^3.3.3
         version: 3.3.3
@@ -131,8 +131,8 @@ importers:
   examples/manual:
     dependencies:
       fastify:
-        specifier: ^5.0.0
-        version: 5.0.0
+        specifier: ^5.1.0
+        version: 5.1.0
       graphql:
         specifier: ^16.9.0
         version: 16.9.0
@@ -160,7 +160,7 @@ importers:
         version: 2.12.6(graphql@16.9.0)
       mercurius-integration-testing:
         specifier: ^9.0.0
-        version: 9.0.0(fastify@5.0.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
+        version: 9.0.0(fastify@5.1.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0))
       prettier:
         specifier: ^3.3.3
         version: 3.3.3
@@ -247,8 +247,8 @@ importers:
         specifier: ^7.0.3
         version: 7.0.3
       fastify:
-        specifier: ^5.0.0
-        version: 5.0.0
+        specifier: ^5.1.0
+        version: 5.1.0
       graphql:
         specifier: ^16.9.0
         version: 16.9.0
@@ -1720,8 +1720,8 @@ packages:
   fastify-plugin@5.0.0:
     resolution: {integrity: sha512-0725fmH/yYi8ugsjszLci+lLnGBK6cG+WSxM7edY2OXJEU7gr2JiGBoieL2h9mhTych1vFsEfXsAsGGDJ/Rd5w==}
 
-  fastify@5.0.0:
-    resolution: {integrity: sha512-Qe4dU+zGOzg7vXjw4EvcuyIbNnMwTmcuOhlOrOJsgwzvjEZmsM/IeHulgJk+r46STjdJS/ZJbxO8N70ODXDMEQ==}
+  fastify@5.1.0:
+    resolution: {integrity: sha512-0SdUC5AoiSgMSc2Vxwv3WyKzyGMDJRAW/PgNsK1kZrnkO6MeqUIW9ovVg9F2UGIqtIcclYMyeJa4rK6OZc7Jxg==}
 
   fastparallel@2.4.1:
     resolution: {integrity: sha512-qUmhxPgNHmvRjZKBFUNI0oZuuH9OlSIOXmJ98lhKPxMZZ7zS/Fi0wRHOihDSz0R1YiIOjxzOY4bq65YTcdBi2Q==}
@@ -5142,7 +5142,7 @@ snapshots:
 
   fastify-plugin@5.0.0: {}
 
-  fastify@5.0.0:
+  fastify@5.1.0:
     dependencies:
       '@fastify/ajv-compiler': 4.0.0
       '@fastify/error': 4.0.0
@@ -5739,11 +5739,11 @@ snapshots:
 
   meow@12.1.1: {}
 
-  mercurius-integration-testing@9.0.0(fastify@5.0.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0)):
+  mercurius-integration-testing@9.0.0(fastify@5.1.0)(graphql@16.9.0)(mercurius@15.1.0(graphql@16.9.0)):
     dependencies:
       '@graphql-typed-document-node/core': 3.2.0(graphql@16.9.0)
       cookie: 0.5.0
-      fastify: 5.0.0
+      fastify: 5.1.0
       graphql: 16.9.0
       mercurius: 15.1.0(graphql@16.9.0)
       ws: 8.18.0