diff --git a/Gemfile.lock b/Gemfile.lock
index 4e571d4..4964b79 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    iruby-chartkick (0.5.1)
+    iruby-chartkick (0.4.0)
       chartkick (~> 5.1.0)
       iruby