diff --git a/Gemfile b/Gemfile
index 2a1c4f7d73a0b2de1fb10c4c153772f4c2148ef4..2418a02a451e27f738b7c40816211b4a3859be5e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -172,7 +172,7 @@ gem 'ruby-fogbugz', '~> 0.2.1'
 gem 'd3_rails', '~> 3.5.5'
 
 #cal-heatmap
-gem "cal-heatmap-rails", "~> 0.0.1"
+gem 'cal-heatmap-rails', '~> 3.5.0'
 
 # underscore-rails
 gem "underscore-rails", "~> 1.8.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 9769ae80a7dfa84f11518c1a1f1e954f240e3c3f..ddd31e4802dc6f550366a50f63114d2b87e24839 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,7 @@ GEM
       bundler (~> 1.2)
       thor (~> 0.18)
     byebug (8.2.1)
-    cal-heatmap-rails (0.0.1)
+    cal-heatmap-rails (3.5.1)
     capybara (2.4.4)
       mime-types (>= 1.16)
       nokogiri (>= 1.3.3)
@@ -849,7 +849,7 @@ DEPENDENCIES
   bullet
   bundler-audit
   byebug
-  cal-heatmap-rails (~> 0.0.1)
+  cal-heatmap-rails (~> 3.5.0)
   capybara (~> 2.4.0)
   capybara-screenshot (~> 1.0.0)
   carrierwave (~> 0.9.0)