diff --git a/gemfiles/Gemfile.rails-4.1-stable b/gemfiles/Gemfile.rails-4.1-stable
index 28416032..5db67dad 100644
--- a/gemfiles/Gemfile.rails-4.1-stable
+++ b/gemfiles/Gemfile.rails-4.1-stable
@@ -7,7 +7,7 @@ gemspec path: ".."
 gem "rails", github: "rails/rails", branch: "4-1-stable"
 gem "omniauth"
 gem "omniauth-oauth2"
-gem "rdoc"
+gem "rdoc", "~> 5.1"
 
 group :test do
   gem "omniauth-facebook"
diff --git a/gemfiles/Gemfile.rails-4.1-stable.lock b/gemfiles/Gemfile.rails-4.1-stable.lock
index 176928bc..4e5ada85 100644
--- a/gemfiles/Gemfile.rails-4.1-stable.lock
+++ b/gemfiles/Gemfile.rails-4.1-stable.lock
@@ -162,7 +162,7 @@ DEPENDENCIES
   omniauth-oauth2
   omniauth-openid
   rails!
-  rdoc
+  rdoc (~> 5.1)
   sqlite3
   test_after_commit
   webrat (= 0.7.3)
diff --git a/gemfiles/Gemfile.rails-4.2-stable b/gemfiles/Gemfile.rails-4.2-stable
index 7856859f..f3912002 100644
--- a/gemfiles/Gemfile.rails-4.2-stable
+++ b/gemfiles/Gemfile.rails-4.2-stable
@@ -7,7 +7,7 @@ gemspec path: ".."
 gem "rails", github: "rails/rails", branch: "4-2-stable"
 gem "omniauth"
 gem "omniauth-oauth2"
-gem "rdoc"
+gem "rdoc", "~> 5.1"
 
 group :test do
   gem "omniauth-facebook"
diff --git a/gemfiles/Gemfile.rails-4.2-stable.lock b/gemfiles/Gemfile.rails-4.2-stable.lock
index 84933ed9..acf63925 100644
--- a/gemfiles/Gemfile.rails-4.2-stable.lock
+++ b/gemfiles/Gemfile.rails-4.2-stable.lock
@@ -183,7 +183,7 @@ DEPENDENCIES
   omniauth-oauth2
   omniauth-openid
   rails!
-  rdoc
+  rdoc (~> 5.1)
   sqlite3
   test_after_commit
   webrat (= 0.7.3)