diff --git a/Gemfile.lock b/Gemfile.lock
index 2817e06..f42e238 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (~> 1.2)
       xpath (~> 3.2)
-    chartkick (2.3.4)
+    chartkick (3.4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     chromedriver-helper (2.1.0)