diff --git a/Gemfile b/Gemfile
index b5e8664..a04353b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -59,7 +59,7 @@ gem 'rails-i18n'
 gem 'rails_warden'
 gem 'redis', require: %w[redis redis/connection/hiredis]
 gem 'redis-rails'
-gem 'rollups'
+gem 'rollups', git: 'https://github.com/ankane/rollup.git', branch: 'master'
 gem 'rubyzip'
 gem 'rugged'
 gem 'concurrent-ruby-ext'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9d1f512..c1f6925 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,6 +6,15 @@ GIT
       rails (>= 3.0)
       rake (>= 0.8.7)
 
+GIT
+  remote: https://github.com/ankane/rollup.git
+  revision: 94ca777d54180c23e96ac4b4285cc9b405ccbd1a
+  branch: master
+  specs:
+    rollups (0.1.2)
+      activesupport (>= 5.1)
+      groupdate (>= 5.2)
+
 GIT
   remote: https://github.com/fauno/email_address
   revision: 536b51f7071b68a55140c0c1726b4cd401d1c04d
@@ -483,9 +492,6 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     rexml (3.2.5)
-    rollups (0.1.2)
-      activesupport (>= 5.1)
-      groupdate (>= 5.2)
     rouge (3.26.0)
     rubocop (1.18.3)
       parallel (~> 1.10)
@@ -700,7 +706,7 @@ DEPENDENCIES
   recursero-jekyll-theme
   redis
   redis-rails
-  rollups
+  rollups!
   rubocop-rails
   rubyzip
   rugged