diff --git a/Gemfile.lock b/Gemfile.lock
index 5e620c17..744e2fd4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     parser (3.3.11.1)
       ast (~> 2.4.1)
       racc
-    pp (0.6.3)
+    pp (0.6.4)
       prettyprint
     prettyprint (0.2.0)
     prism (1.9.0)