diff --git a/Gemfile.lock b/Gemfile.lock
index 9c18ca3..2d9fd68 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -56,7 +56,7 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (>= 2.0, < 4.0)
-    chartkick (2.2.4)
+    chartkick (3.4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     coffee-rails (4.0.1)