diff --git a/.github/workflows/ancient.yml b/.github/workflows/ancient.yml
index d1e973b..24806ab 100644
--- a/.github/workflows/ancient.yml
+++ b/.github/workflows/ancient.yml
@@ -31,10 +31,6 @@ jobs:
           # Skips the gemspec, to avoid the modern development tools which can't be installed on ancient Rubies.
           - ancient
         ruby:
-          - "2.3"
-          - "2.4"
-          - "2.5"
-          - "2.6"
           - "2.7"
     runs-on: ubuntu-22.04
     continue-on-error: ${{ matrix.experimental || endsWith(matrix.ruby, 'head') }}
diff --git a/rots.gemspec b/rots.gemspec
index 941f390..508b4a1 100644
--- a/rots.gemspec
+++ b/rots.gemspec
@@ -50,6 +50,7 @@ Gem::Specification.new do |spec|
     rots
   ]
   spec.license = "MIT"
+  spec.required_ruby_version = ">= 2.7.0"
 
   spec.add_dependency("date")
   spec.add_dependency("net-http")