diff --git a/composer.json b/composer.json
index 41152cf..e7e2c16 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
   "type": "typo3-cms-extension",
   "description": "Optimization of the final page: reformatting the (x)html output, removal of new lines, and quotes.",
   "homepage": "https://github.com/lochmueller/sourceopt",
-  "version": "0.9.3",
+  "version": "1.0.0",
   "autoload": {
     "psr-4": {
       "HTML\\Sourceopt\\": "Classes/"
diff --git a/ext_emconf.php b/ext_emconf.php
index a4108c1..29fc264 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -4,7 +4,7 @@
     'title' => 'Source Optimization',
     'description' => 'Optimization of the final page: reformatting the (x)html output, removal of new lines, and quotes. Move development repository to https://github.com/lochmueller/sourceopt',
     'category' => 'fe',
-    'version' => '0.9.3',
+    'version' => '1.0.0',
     'state' => 'stable',
     'author' => 'Dr. Ronald P. Steiner, Boris Nicolai, Tim Lochmueller',
     'author_email' => 'ronald.steiner@googlemail.com, boris.nicolai@andavida.com, tim@fruit-lab.de',