diff --git a/Gemfile.lock b/Gemfile.lock
index 70a1484..182e79a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
       parallel (= 1.20.1)
     coderay (1.1.3)
     concurrent-ruby (1.1.9)
-    css_parser (1.11.0)
+    css_parser (1.22.0)
       addressable
     hashery (2.1.2)
     parallel (1.20.1)