diff --git a/extend-rails/Gemfile.lock b/extend-rails/Gemfile.lock
index 87881c7..4dd5cc7 100644
--- a/extend-rails/Gemfile.lock
+++ b/extend-rails/Gemfile.lock
@@ -59,7 +59,7 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (>= 2.0, < 4.0)
-    chartkick (3.2.0)
+    chartkick (3.4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     coderay (1.1.2)