diff --git a/package.json b/package.json
index fd261fad1..41ab95627 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prettier",
-  "version": "3.9.9",
+  "version": "3.10.0-dev",
   "description": "Prettier is an opinionated code formatter",
   "bin": "./bin/prettier.cjs",
   "repository": "prettier/prettier",
@@ -184,7 +184,7 @@
     "node-style-text": "2.1.2",
     "npm-run-all2": "9.0.2",
     "open-editor": "6.0.0",
-    "prettier": "3.9.8",
+    "prettier": "3.9.9",
     "pretty-bytes": "7.1.0",
     "pretty-ms": "9.3.0",
     "puppeteer": "25.3.0",
diff --git a/yarn.lock b/yarn.lock
index 03baa168a..56fd4bee9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8298,12 +8298,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"prettier@npm:3.9.8":
-  version: 3.9.8
-  resolution: "prettier@npm:3.9.8"
+"prettier@npm:3.9.9":
+  version: 3.9.9
+  resolution: "prettier@npm:3.9.9"
   bin:
     prettier: bin/prettier.cjs
-  checksum: 10/4ac262aaf9a5e221b02cc17447ebe7aa9689be59b85ab9de8152cd7422fb363ed3e09da6df585fa19ab1fc6cffebdc3ea34db1a75c978536aeba3f87bfd06ab3
+  checksum: 10/3d11a8095a7db50f0fbc8086ad96be676401154b63a2e9023e1274893457dccab19a9c211f4fb2cae7244e800bea2d5185d9bb6fc510f48a53017815e47d4e6d
   languageName: node
   linkType: hard
 
@@ -8433,7 +8433,7 @@ __metadata:
     postcss-scss: "npm:4.0.9"
     postcss-selector-parser: "npm:2.2.3"
     postcss-values-parser: "npm:2.0.1"
-    prettier: "npm:3.9.8"
+    prettier: "npm:3.9.9"
     pretty-bytes: "npm:7.1.0"
     pretty-ms: "npm:9.3.0"
     puppeteer: "npm:25.3.0"