diff --git a/searx/static/themes/oscar/package.json b/searx/static/themes/oscar/package.json
index ea522b9d0..089793f69 100644
--- a/searx/static/themes/oscar/package.json
+++ b/searx/static/themes/oscar/package.json
@@ -6,7 +6,7 @@
         "grunt-contrib-copy": "^1.0.0",
         "grunt-contrib-jshint": "~3.1.1",
         "grunt-contrib-less": "~3.0.0",
-        "grunt-contrib-uglify": "~5.0.1",
+        "grunt-contrib-uglify": "~5.1.0",
         "grunt-contrib-watch": "~1.1.0",
         "jslint": "^0.12.1",
         "less": "^4.1.1",
diff --git a/searx/static/themes/simple/package.json b/searx/static/themes/simple/package.json
index 6cd5c0836..de6aa1a65 100644
--- a/searx/static/themes/simple/package.json
+++ b/searx/static/themes/simple/package.json
@@ -5,7 +5,7 @@
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-cssmin": "^4.0.0",
     "grunt-contrib-less": "~3.0.0",
-    "grunt-contrib-uglify": "~5.0.1",
+    "grunt-contrib-uglify": "~5.1.0",
     "grunt-xmlmin": "~0.1.8",
     "grunt-contrib-watch": "~1.1.0",
     "grunt-eslint": "^24.0.0",