diff --git a/Gemfile b/Gemfile
index 19de178..71a5c2c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'activesupport', '4.1.6'
+gem 'activesupport', '5.2.3'
 
 group :development, :test do
   gemspec name: 'meter'