diff --git a/package-lock.json b/package-lock.json
index 951a2c5..5874005 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -44,7 +44,7 @@
         "node": ">=14.0.0"
       },
       "peerDependencies": {
-        "fastify": "^3.21.6"
+        "fastify": "^3.21.6 || ^4.0.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -8450,11 +8450,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/npm/node_modules/stringify-package": {
-      "version": "1.0.1",
-      "dev": true,
-      "license": "ISC"
-    },
     "node_modules/npm/node_modules/strip-ansi": {
       "version": "6.0.1",
       "dev": true,
@@ -16881,10 +16876,6 @@
             "strip-ansi": "^6.0.1"
           }
         },
-        "stringify-package": {
-          "version": "1.0.1",
-          "dev": true
-        },
         "strip-ansi": {
           "version": "6.0.1",
           "bundled": true,
diff --git a/package.json b/package.json
index e514392..62ed4e9 100644
--- a/package.json
+++ b/package.json
@@ -57,6 +57,6 @@
     "json-schema-to-typescript": "^10.1.5"
   },
   "peerDependencies": {
-    "fastify": "^3.21.6"
+    "fastify": "^3.21.6 || ^4.0.0"
   }
 }