diff --git a/Gemfile.lock b/Gemfile.lock
index e2859c47c..e249ae8c3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -158,7 +158,8 @@ GEM
     parser (3.3.3.0)
       ast (~> 2.4.1)
       racc
-    psych (5.2.0)
+    psych (5.2.1)
+      date
       stringio
     public_suffix (6.0.1)
     puma (6.5.0)