diff --git a/grafast/grafserv/package.json b/grafast/grafserv/package.json
index 2df5274b0f..8f0f39bafe 100644
--- a/grafast/grafserv/package.json
+++ b/grafast/grafserv/package.json
@@ -153,7 +153,7 @@
     "@whatwg-node/fetch": "^0.10.8",
     "@whatwg-node/server": "^0.10.10",
     "express": "^4.21.2",
-    "fastify": "^5.8.3",
+    "fastify": "^5.8.5",
     "grafast": "workspace:^",
     "graphql": "^16.9.0",
     "graphql-http": "^1.22.4",
diff --git a/graphile-build/graphile-build-pg/package.json b/graphile-build/graphile-build-pg/package.json
index f060ba5807..9163f7657b 100644
--- a/graphile-build/graphile-build-pg/package.json
+++ b/graphile-build/graphile-build-pg/package.json
@@ -108,7 +108,7 @@
     "@types/jsonwebtoken": "^9.0.10",
     "chalk": "^4.1.2",
     "express": "^4.21.2",
-    "fastify": "^5.8.3",
+    "fastify": "^5.8.5",
     "grafast": "workspace:^",
     "grafserv": "workspace:^",
     "graphile-export": "workspace:^",
diff --git a/yarn.lock b/yarn.lock
index 61b0574602..ca71ecd13e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -13808,9 +13808,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fastify@npm:^5.8.3":
-  version: 5.8.4
-  resolution: "fastify@npm:5.8.4"
+"fastify@npm:^5.8.5":
+  version: 5.8.5
+  resolution: "fastify@npm:5.8.5"
   dependencies:
     "@fastify/ajv-compiler": "npm:^4.0.5"
     "@fastify/error": "npm:^4.0.0"
@@ -13827,7 +13827,7 @@ __metadata:
     secure-json-parse: "npm:^4.0.0"
     semver: "npm:^7.6.0"
     toad-cache: "npm:^3.7.0"
-  checksum: 10/979e8d980aba673b8801e898a322df4ab594819666f74441c8aebc6cfc88eece72f545415f3945da8a5dbb831995cc88ea4a2bade448fe4570a360bc9cb4cab6
+  checksum: 10/286054e09964743b3e36ae7fb5d78a46662adb818ac305efca6a09560c9f7346881b0f1ef51736bdd334f5bfecab4461dacdb55bef10e6b64829bbfcc397474d
   languageName: node
   linkType: hard
 
@@ -14708,7 +14708,7 @@ __metadata:
     debug: "npm:^4.4.3"
     eventemitter3: "npm:^5.0.1"
     express: "npm:^4.21.2"
-    fastify: "npm:^5.8.3"
+    fastify: "npm:^5.8.5"
     grafast: "workspace:^"
     graphile-config: "workspace:^"
     graphql: "npm:^16.9.0"
@@ -14773,7 +14773,7 @@ __metadata:
     chalk: "npm:^4.1.2"
     debug: "npm:^4.4.3"
     express: "npm:^4.21.2"
-    fastify: "npm:^5.8.3"
+    fastify: "npm:^5.8.5"
     grafast: "workspace:^"
     grafserv: "workspace:^"
     graphile-config: "workspace:^"