diff --git a/Gemfile.lock b/Gemfile.lock
index f67a1c6..f6428dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,20 +2,22 @@ PATH
   remote: .
   specs:
     phoenix-cli (0.0.2)
-      activesupport (~> 4.2.1)
+      activesupport (>= 4.2.1, < 7.1.0)
       thor (~> 0.19)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.9)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
+    activesupport (7.0.4.3)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    concurrent-ruby (1.2.2)
     diff-lcs (1.3)
-    i18n (0.8.6)
-    minitest (5.10.2)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
+    minitest (5.18.0)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -29,10 +31,9 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.6.0)
     rspec-support (3.6.0)
-    thor (0.19.4)
-    thread_safe (0.3.6)
-    tzinfo (1.2.3)
-      thread_safe (~> 0.1)
+    thor (0.20.3)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
 
 PLATFORMS
   ruby
diff --git a/phoenix-cli.gemspec b/phoenix-cli.gemspec
index 5a44916..85a9c15 100644
--- a/phoenix-cli.gemspec
+++ b/phoenix-cli.gemspec
@@ -17,6 +17,6 @@ Gem::Specification.new do |s|
     s.require_paths = ['lib']
 
     s.add_runtime_dependency 'thor', '~> 0.19'
-    s.add_runtime_dependency 'activesupport', '~> 4.2.1'
+    s.add_runtime_dependency 'activesupport', '>= 4.2.1', '< 7.1.0'
     s.add_development_dependency 'rspec', '~> 3'
 end
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