diff --git a/.travis.yml b/.travis.yml
index 97b3721..fabd211 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,6 @@ before_install:
   - gem install bundler
 
 rvm:
-  - 2.3
   - 2.4
   - 2.5
   - ruby-head
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6bd15b..4ed3574 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Upcoming release
 
+**Breaking changes:**
+- Dropped support for Rails 4.3
+
 ## v3.0.0.beta1 (2019-02-28)
 
 **Breaking changes:**
diff --git a/README.md b/README.md
index 0271f6e..1402bee 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ This gem has been inspired by our Rails development practices at [Ouvrages](http
 
 ## Compatibility
 
-- Ruby 2.3+
+- Ruby 2.4+
 - Rails 5.0+
 - Webpacker 3.0.0+
 
diff --git a/komponent.gemspec b/komponent.gemspec
index 42f60c2..8af086e 100644
--- a/komponent.gemspec
+++ b/komponent.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   end
 
   spec.require_paths = ["lib"]
-  spec.required_ruby_version = '>= 2.3.0'
+  spec.required_ruby_version = '>= 2.4.0'
 
   spec.add_dependency "actionview", ">= 5.0"
   spec.add_dependency "activesupport", ">= 5.0"