diff --git a/Gemfile b/Gemfile
index b92d7b4..3bda8ed 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gem "faraday", "~> 0.5.7"
 gem "excon", "~> 0.5.6"
 gem "yajl-ruby", "~> 0.8.1", :require => "yajl"
 
-gem "activesupport", "~> 3.0.4"
+gem "activesupport", "~> 3.1.12"
 gem "i18n", "~> 0.5.0" # ActiveSupport dependency
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 12f340c..838ee8f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,8 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (3.0.4)
+    activesupport (3.1.12)
+      multi_json (~> 1.0)
     addressable (2.2.4)
     diff-lcs (1.1.2)
     excon (0.5.6)
@@ -10,6 +11,7 @@ GEM
       multipart-post (~> 1.1.0)
       rack (>= 1.1.0, < 2)
     i18n (0.5.0)
+    multi_json (1.14.1)
     multipart-post (1.1.0)
     rack (1.2.1)
     rake (0.8.7)
@@ -27,7 +29,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (~> 3.0.4)
+  activesupport (~> 3.1.12)
   bundler (~> 1.0.0)
   excon (~> 0.5.6)
   faraday (~> 0.5.7)
diff --git a/pingdom-client.gemspec b/pingdom-client.gemspec
index fd391e4..8d93690 100644
--- a/pingdom-client.gemspec
+++ b/pingdom-client.gemspec
@@ -47,7 +47,7 @@ Gem::Specification.new do |s|
       s.add_runtime_dependency("faraday",       ["~> 0.5.7"])
       s.add_runtime_dependency("excon",         ["~> 0.5.6"])
       s.add_runtime_dependency("yajl-ruby",     ["~> 0.8.1"])
-      s.add_runtime_dependency("activesupport", ["~> 3.0.4"])
+      s.add_runtime_dependency("activesupport", ">= 3.0.4", "< 6.1.0")
       s.add_runtime_dependency("i18n",          ["~> 0.5.0"])
       
       s.add_development_dependency("bundler", ["~> 1.0.0"])
@@ -57,7 +57,7 @@ Gem::Specification.new do |s|
       s.add_dependency("faraday",       ["~> 0.5.7"])
       s.add_dependency("excon",         ["~> 0.5.6"])
       s.add_dependency("yajl-ruby",     ["~> 0.8.1"])
-      s.add_dependency("activesupport", ["~> 3.0.4"])
+      s.add_dependency("activesupport", ">= 3.0.4", "< 6.1.0")
       s.add_dependency("i18n",          ["~> 0.5.0"])
       
       s.add_dependency("bundler", ["~> 1.0.0"])
@@ -68,7 +68,7 @@ Gem::Specification.new do |s|
     s.add_dependency("faraday",       ["~> 0.5.7"])
     s.add_dependency("excon",         ["~> 0.5.6"])
     s.add_dependency("yajl-ruby",     ["~> 0.8.1"])
-    s.add_dependency("activesupport", ["~> 3.0.4"])
+    s.add_dependency("activesupport", ">= 3.0.4", "< 6.1.0")
     s.add_dependency("i18n",          ["~> 0.5.0"])
     
     s.add_dependency("bundler", ["~> 1.0.0"])