diff --git a/Gemfile.lock b/Gemfile.lock
index 8a95ca7..58fbe78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,27 +3,29 @@ PATH
   specs:
     taskmapper (1.0.1)
       activeresource (~> 3.2)
-      activesupport (~> 3.2)
+      activesupport (>= 3.2, < 7.0)
       hashie (~> 2.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (3.2.14)
-      activesupport (= 3.2.14)
+    activemodel (3.2.22.5)
+      activesupport (= 3.2.22.5)
       builder (~> 3.0.0)
-    activeresource (3.2.14)
-      activemodel (= 3.2.14)
-      activesupport (= 3.2.14)
-    activesupport (3.2.14)
+    activeresource (3.2.22.5)
+      activemodel (= 3.2.22.5)
+      activesupport (= 3.2.22.5)
+    activesupport (3.2.22.5)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
     builder (3.0.4)
+    concurrent-ruby (1.1.5)
     diff-lcs (1.2.4)
-    hashie (2.0.5)
-    i18n (0.6.5)
+    hashie (2.1.2)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     json (1.8.0)
-    multi_json (1.8.0)
+    multi_json (1.14.0)
     rake (10.0.4)
     rdoc (4.0.1)
       json (~> 1.4)
diff --git a/taskmapper.gemspec b/taskmapper.gemspec
index 1563a65..6d051cc 100644
--- a/taskmapper.gemspec
+++ b/taskmapper.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "activeresource", "~> 3.2"
-  spec.add_dependency "activesupport", "~> 3.2"
+  spec.add_dependency "activesupport", ">= 3.2", "< 7.0"
   spec.add_dependency "hashie", "~> 2.0"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rdoc", "~> 4.0"