diff --git a/Gemfile b/Gemfile
index c80bad2..20762ec 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
 gem 'icalendar', '~> 2.2.1'
-gem 'activesupport', '~> 4.1.11'
+gem 'activesupport', '~> 6.0.6'
 gem 'pry'
diff --git a/Gemfile.lock b/Gemfile.lock
index ff5257b..4fd3785 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,32 +1,32 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.1.16)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
+    activesupport (6.0.6.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.1)
       tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
     coderay (1.1.2)
-    concurrent-ruby (1.1.4)
-    i18n (0.9.5)
+    concurrent-ruby (1.2.0)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     icalendar (2.2.2)
-    json (1.8.6)
     method_source (0.9.2)
-    minitest (5.11.3)
+    minitest (5.17.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (~> 4.1.11)
+  activesupport (~> 6.0.6)
   icalendar (~> 2.2.1)
   pry