diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ea0175c..2275d55 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: [2.4, 2.5, 2.6, 2.7, '3.0', '3.1', '3.2']
+        ruby: ['2.7', '3.0', '3.1', '3.2']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
diff --git a/.ruby-version b/.ruby-version
index b0f6bf0..1effb00 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.4.10
+2.7
diff --git a/Gemfile b/Gemfile
index 3ce717f..e481850 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+ruby ">= 2.7"
+
 source "https://rubygems.org"
 
 gem "pg_query", ">= 1.0"
diff --git a/sqlint.gemspec b/sqlint.gemspec
index 681b43b..6f2f41d 100644
--- a/sqlint.gemspec
+++ b/sqlint.gemspec
@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.name = 'sqlint'
   s.version = SQLint::VERSION
   s.platform = Gem::Platform::RUBY
-  s.required_ruby_version = '>= 1.9.3'
+  s.required_ruby_version = '>= 2.7'
   s.authors = ['Steve Purcell', 'Kieran Trezona-le Comte']
   s.description = <<-EOF
     Simple SQL linter.