diff --git a/Gemfile.lock b/Gemfile.lock
index 10cf12079..116033d1d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -339,8 +339,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    slimmer (17.0.0)
-      activesupport
+    slimmer (18.0.0)
       json
       nokogiri (~> 1.7)
       null_logger