diff --git a/Gemfile.lock b/Gemfile.lock
index 997364f..04f9c9e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,7 +93,7 @@ GEM
       method_source (~> 1.0)
     pry-nav (1.0.0)
       pry (>= 0.9.10, < 0.15)
-    psych (5.3.1)
+    psych (5.4.0)
       date
       stringio
     racc (1.8.1)