diff --git a/Gemfile.lock b/Gemfile.lock
index 77e10c7..8c3fca7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,18 +6,19 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.11.3)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
+    activesupport (6.1.7.3)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     ast (2.4.2)
     code-scanning-rubocop (0.6.1)
       rubocop (~> 1.0)
     coderay (1.1.3)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     diff-lcs (1.5.0)
-    i18n (0.9.5)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     libxml-ruby (3.2.2)
     method_source (1.0.0)
@@ -70,16 +71,16 @@ GEM
     shoulda-context (2.0.0)
     shoulda-matchers (4.5.1)
       activesupport (>= 4.2.0)
-    thread_safe (0.3.6)
-    tzinfo (1.2.9)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
     unicode-display_width (2.1.0)
+    zeitwerk (2.6.7)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (~> 4.2.2)
+  activesupport (~> 6.1.7)
   bundler
   code-scanning-rubocop (~> 0.5)
   libxml-ruby (~> 3)
diff --git a/opensrs.gemspec b/opensrs.gemspec
index de42872..4de1080 100644
--- a/opensrs.gemspec
+++ b/opensrs.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'activesupport', '~> 4.2.2'
+  spec.add_development_dependency 'activesupport', '~> 6.1.7'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'code-scanning-rubocop', '~> 0.5'
   spec.add_development_dependency 'libxml-ruby', '~> 3'