diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 03a53ff5..2f64c2f7 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -29,13 +29,11 @@ jobs:
           - macos
         ruby-version:
           - jruby-9.4
-          - jruby-9.3
           - 3.3
           - 3.2
           - 3.1
           - '3.0'
           - 2.7
-          - 2.6
 
     needs:
       - lint
diff --git a/.rubocop.yml b/.rubocop.yml
index 3b281d37..eb1d29d3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,7 +1,7 @@
 # inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 2.7
 
 Naming/PredicateName:
   AllowedMethods:
diff --git a/README.md b/README.md
index a6356058..092c317d 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 Ruby client for the [Unleash](https://github.com/Unleash/unleash) feature management service.
 
->  **Migrating to v6** 
+>  **Migrating to v6**
 >
 > If you use [custom strategies](#custom-strategies) or override built-in ones, read the complete [migration guide](./v6_MIGRATION_GUIDE.md) before upgrading to v6.
 
@@ -18,9 +18,7 @@ Ruby client for the [Unleash](https://github.com/Unleash/unleash) feature manage
 - MRI 3.1
 - MRI 3.0
 - MRI 2.7
-- MRI 2.6
 - jruby 9.4
-- jruby 9.3
 
 ## Installation
 
diff --git a/unleash-client.gemspec b/unleash-client.gemspec
index 4054d685..57d6347e 100644
--- a/unleash-client.gemspec
+++ b/unleash-client.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'bin'
   spec.executables   = spec.files.grep(%r{^bin/unleash}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
-  spec.required_ruby_version = ">= 2.6"
+  spec.required_ruby_version = ">= 2.7"
 
   spec.add_dependency "murmurhash3", "~> 0.1.7"
   spec.add_dependency "yggdrasil-engine", "~> 0.0.6"