diff --git a/Gemfile.lock b/Gemfile.lock
index 5f471aa..8c270ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -167,7 +167,8 @@ GEM
     parser (3.3.6.0)
       ast (~> 2.4.1)
       racc
-    psych (5.2.0)
+    psych (5.2.1)
+      date
       stringio
     puma (6.5.0)
       nio4r (~> 2.0)