diff --git a/tools/syn2mas/package-lock.json b/tools/syn2mas/package-lock.json
index f39317f68..822c8c08e 100644
--- a/tools/syn2mas/package-lock.json
+++ b/tools/syn2mas/package-lock.json
@@ -25,7 +25,7 @@
         "@typescript-eslint/parser": "^5.62.0",
         "eslint": "^8.51.0",
         "eslint-config-google": "^0.14.0",
-        "eslint-config-prettier": "^8.8.0",
+        "eslint-config-prettier": "^9.0.0",
         "eslint-plugin-import": "^2.27.5",
         "eslint-plugin-matrix-org": "github:matrix-org/eslint-plugin-matrix-org",
         "eslint-plugin-unicorn": "^46.0.0",
@@ -2211,11 +2211,10 @@
       }
     },
     "node_modules/eslint-config-prettier": {
-      "version": "8.8.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-8.8.0.tgz",
-      "integrity": "sha512-wLbQiFre3tdGgpDv67NQKnJuTlcUVYHas3k+DZCc2U2BadthoEY4B7hLPvAxaqdyOGCzuLfii2fqGph10va7oA==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-9.0.0.tgz",
+      "integrity": "sha512-IcJsTkJae2S35pRsRAwoCE+925rJJStOdkKnLVgtE+tEpqU0EVVM7OqrwxqgptKdX29NUwC82I5pXsGFIgSevw==",
       "dev": true,
-      "license": "MIT",
       "bin": {
         "eslint-config-prettier": "bin/cli.js"
       },
diff --git a/tools/syn2mas/package.json b/tools/syn2mas/package.json
index 3cdef644a..301384f25 100644
--- a/tools/syn2mas/package.json
+++ b/tools/syn2mas/package.json
@@ -19,7 +19,7 @@
     "@typescript-eslint/parser": "^5.62.0",
     "eslint": "^8.51.0",
     "eslint-config-google": "^0.14.0",
-    "eslint-config-prettier": "^8.8.0",
+    "eslint-config-prettier": "^9.0.0",
     "eslint-plugin-import": "^2.27.5",
     "eslint-plugin-matrix-org": "github:matrix-org/eslint-plugin-matrix-org",
     "eslint-plugin-unicorn": "^46.0.0",