diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d0fa39..5877ebb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.1.0 (unreleased)
+
+- Dropped support for Ruby < 3.1
+
 ## 5.0.7 (2024-05-21)
 
 - Updated Chart.js to 4.4.3
diff --git a/chartkick.gemspec b/chartkick.gemspec
index 79fe52e..5ac81ce 100644
--- a/chartkick.gemspec
+++ b/chartkick.gemspec
@@ -13,5 +13,5 @@ Gem::Specification.new do |spec|
   spec.files         = Dir["*.{md,txt}", "{lib,licenses,vendor}/**/*"]
   spec.require_path  = "lib"
 
-  spec.required_ruby_version = ">= 2.7"
+  spec.required_ruby_version = ">= 3.1"
 end