diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d0c05ec3..396e9172 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,12 +19,10 @@ jobs:
       fail-fast: false
 
       matrix:
-        ruby: [2.5.9, 2.6.9, 2.7.5, 3.0.3, jruby-9.3.2.0]
+        ruby: [2.6.9, 2.7.5, 3.0.3, jruby-9.3.2.0]
         deps: [rails_61, rails_70]
 
         exclude:
-          - deps: rails_70
-            ruby: 2.5.9
           - deps: rails_70
             ruby: 2.6.9
           - deps: rails_70
diff --git a/.rubocop.yml b/.rubocop.yml
index a3dbf7e0..2d91f00f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,7 +8,7 @@ AllCops:
   DisplayCopNames: true
   DisplayStyleGuide: true
 
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.6
 
 Metrics:
   Enabled: false
diff --git a/arbre.gemspec b/arbre.gemspec
index 4e1f008c..f0aa65b3 100644
--- a/arbre.gemspec
+++ b/arbre.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   s.require_paths = ["lib"]
 
-  s.required_ruby_version = '>= 2.5'
+  s.required_ruby_version = '>= 2.6'
 
   s.add_dependency("activesupport", ">= 3.0.0", "< 7.1")
   s.add_dependency("ruby2_keywords", ">= 0.0.2", "< 1.0")