diff --git a/package.json b/package.json
index f030776..8a3b924 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
         "cssnano": "4.1.10",
         "gscan": "3.1.1",
         "gulp": "4.0.2",
-        "gulp-concat": "^2.6.1",
+        "gulp-concat": "2.6.1",
         "gulp-livereload": "4.0.2",
         "gulp-postcss": "8.0.0",
         "gulp-uglify": "3.0.2",
diff --git a/yarn.lock b/yarn.lock
index a9715d0..b61b511 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1903,7 +1903,7 @@ gulp-cli@^2.2.0:
     v8flags "^3.0.1"
     yargs "^7.1.0"
 
-gulp-concat@^2.6.1:
+gulp-concat@2.6.1:
   version "2.6.1"
   resolved "https://registry.yarnpkg.com/gulp-concat/-/gulp-concat-2.6.1.tgz#633d16c95d88504628ad02665663cee5a4793353"
   integrity sha1-Yz0WyV2IUEYorQJmVmPO5aR5M1M=