diff --git a/package.json b/package.json
index ba5e790..640b92a 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "homepage": "https://www.artichokeruby.org",
   "bugs": "https://github.com/artichoke/sysdir-rs/issues",
   "devDependencies": {
-    "prettier": "3.9.6"
+    "prettier": "3.9.9"
   },
   "scripts": {
     "fmt": "prettier --write \"**/*\""
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c165340..cb06703 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -9,16 +9,16 @@ importers:
   .:
     devDependencies:
       prettier:
-        specifier: 3.9.6
-        version: 3.9.6
+        specifier: 3.9.9
+        version: 3.9.9
 
 packages:
 
-  prettier@3.9.6:
-    resolution: {integrity: sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==}
+  prettier@3.9.9:
+    resolution: {integrity: sha512-Z/CJHIkdujO/OtN7nXUii0Rf3VT5SRuhjBA82Xvu2XhBUgX3nhP67T0LHceBdQLex7OOFGTox+Q5Yg8Jk2Qivg==}
     engines: {node: '>=14'}
     hasBin: true
 
 snapshots:
 
-  prettier@3.9.6: {}
+  prettier@3.9.9: {}