diff --git a/src/js/package-lock.json b/src/js/package-lock.json
index f4ede0962..560f2943f 100644
--- a/src/js/package-lock.json
+++ b/src/js/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "pyodide",
-  "version": "0.18.0a1",
+  "version": "0.18.0dev0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/js/package.json b/src/js/package.json
index 871c0d958..c169f2c72 100644
--- a/src/js/package.json
+++ b/src/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pyodide",
-  "version": "0.18.0a1",
+  "version": "0.18.0dev0",
   "devDependencies": {
     "prettier": "^2.2.1",
     "terser": "^5.7.0",
diff --git a/src/py/pyodide/__init__.py b/src/py/pyodide/__init__.py
index c64b36935..4824913c1 100644
--- a/src/py/pyodide/__init__.py
+++ b/src/py/pyodide/__init__.py
@@ -34,7 +34,7 @@ if IN_BROWSER:
     asyncio.set_event_loop_policy(WebLoopPolicy())
 
 
-__version__ = "0.18.0a1"
+__version__ = "0.18.0dev0"
 
 __all__ = [
     "open_url",