diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index dde51da497..fd09d3b55b 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency('activesupport', version)
   s.add_dependency('rack-cache',    '~> 1.2')
-  s.add_dependency('builder',       '~> 3.0.0')
+  s.add_dependency('builder',       '~> 3.1.0')
   s.add_dependency('rack',          '~> 1.4.1')
   s.add_dependency('rack-test',     '~> 0.6.1')
   s.add_dependency('journey',       '~> 2.0.0')
diff --git a/activemodel/activemodel.gemspec b/activemodel/activemodel.gemspec
index 66f324a1a1..be5d5d3ca8 100644
--- a/activemodel/activemodel.gemspec
+++ b/activemodel/activemodel.gemspec
@@ -18,5 +18,5 @@ Gem::Specification.new do |s|
   s.require_path = 'lib'
 
   s.add_dependency('activesupport', version)
-  s.add_dependency('builder',       '~> 3.0.0')
+  s.add_dependency('builder',       '~> 3.1.0')
 end