diff --git a/package-lock.json b/package-lock.json
index 67cbb51..a2a048b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "grunt-csso",
-  "version": "2.2.3",
+  "version": "2.2.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 9bcd2f9..06925d0 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "grunt-csso",
   "description": "Minify CSS files with CSSO.",
-  "version": "2.2.3",
+  "version": "2.2.4",
   "homepage": "https://github.com/t32k/grunt-csso",
   "author": {
     "name": "Koji Ishimoto",