diff --git a/package-lock.json b/package-lock.json
index 5948a91..04d911a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "debugpy",
-    "version": "2025.8.0",
+    "version": "2025.9.0-dev",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "debugpy",
-            "version": "2025.8.0",
+            "version": "2025.9.0-dev",
             "license": "MIT",
             "dependencies": {
                 "@vscode/debugadapter": "^1.65.0",
diff --git a/package.json b/package.json
index 29da045..61c8c7a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "debugpy",
     "displayName": "Python Debugger",
     "description": "Python Debugger extension using debugpy.",
-    "version": "2025.8.0",
+    "version": "2025.9.0-dev",
     "publisher": "ms-python",
     "enabledApiProposals": [
         "portsAttributes",