diff --git a/package-lock.json b/package-lock.json
index 7762c69..72daa77 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "posthtml-minify-classnames",
-  "version": "0.4.0",
+  "version": "1.0.0-alpha.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "posthtml-minify-classnames",
-      "version": "0.4.0",
+      "version": "1.0.0-alpha.0",
       "license": "MIT",
       "dependencies": {
         "postcss-safe-parser": "4.0.2",
diff --git a/package.json b/package.json
index d8722c1..8235116 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "posthtml-minify-classnames",
-  "version": "0.4.0",
+  "version": "1.0.0-alpha.0",
   "description": "PostHTML plugin for minifying CSS selectors",
   "author": "Simon Laroche <hi@simon.lc> (https://simon.lc)",
   "license": "MIT",