diff --git a/Gemfile.lock b/Gemfile.lock
index 79bb04f..fa4dcfd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ PATH
   specs:
     gitmodel (0.0.8)
       activemodel (~> 3.0.1)
-      activesupport (~> 3.0.1)
+      activesupport (>= 3.0.1, < 7.1.0)
       dalli
       grit (>= 2.3.0)
       lockfile (>= 1.4.3)
@@ -14,25 +14,25 @@ GEM
   remote: http://rubygems.org/
   specs:
     ZenTest (4.6.2)
-    activemodel (3.0.17)
-      activesupport (= 3.0.17)
+    activemodel (3.0.20)
+      activesupport (= 3.0.20)
       builder (~> 2.1.2)
       i18n (~> 0.5.0)
-    activesupport (3.0.17)
+    activesupport (3.0.20)
     autotest (4.4.6)
       ZenTest (>= 4.4.1)
     builder (2.1.2)
-    dalli (2.2.1)
+    dalli (3.2.3)
     diff-lcs (1.1.3)
     grit (2.5.0)
       diff-lcs (~> 1.1)
       mime-types (~> 1.15)
       posix-spawn (~> 0.3.6)
-    i18n (0.5.0)
-    lockfile (2.1.0)
-    mime-types (1.19)
-    posix-spawn (0.3.6)
-    rake (0.9.2.2)
+    i18n (0.5.4)
+    lockfile (2.1.3)
+    mime-types (1.25.1)
+    posix-spawn (0.3.15)
+    rake (13.0.6)
     rspec (2.7.0)
       rspec-core (~> 2.7.0)
       rspec-expectations (~> 2.7.0)
@@ -41,7 +41,7 @@ GEM
     rspec-expectations (2.7.0)
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.7.0)
-    yajl-ruby (1.1.0)
+    yajl-ruby (1.4.3)
 
 PLATFORMS
   ruby
diff --git a/gitmodel.gemspec b/gitmodel.gemspec
index dad2fe7..aeef054 100644
--- a/gitmodel.gemspec
+++ b/gitmodel.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   DESC
 
   s.add_dependency 'activemodel', '~> 3.0.1'
-  s.add_dependency 'activesupport', '~> 3.0.1'
+  s.add_dependency 'activesupport', '>= 3.0.1', '< 7.1.0'
   s.add_dependency 'dalli'
   s.add_dependency 'grit', '>= 2.3.0'
   s.add_dependency 'lockfile', '>= 1.4.3'