diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8e29565..b04f40e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', '3.1', '3.2', '3.3', 'jruby-9.4']
+        ruby: ['3.1', '3.2', '3.3', 'jruby-9.4']
     env:
       BUNDLE_WITHOUT: optional
     steps:
diff --git a/.ruby-version b/.ruby-version
index 818bd47..9cec716 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.0.6
+3.1.6
diff --git a/.tool-versions b/.tool-versions
index acea6c1..007d4c3 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
 java adoptopenjdk-18.0.1+10
-ruby 3.0.6
+ruby 3.1.6
diff --git a/Gemfile.lock b/Gemfile.lock
index da60b4d..b767fda 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,6 @@ PATH
   specs:
     ruby-units (4.1.0)
 
-
 GEM
   remote: https://rubygems.org/
   specs:
diff --git a/README.md b/README.md
index dc504fb..ab8ef09 100644
--- a/README.md
+++ b/README.md
@@ -317,6 +317,10 @@ calculations. This in turn can have a negative impact on performance. The design
 of ruby-units has emphasized accuracy over speed. YMMV if you are doing a lot of
 math involving units.
 
+## Support Policy
+
+Only currently maintained versions of ruby and jruby are supported.
+
 ## License
 
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Folbrich%2Fruby-units.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Folbrich%2Fruby-units?ref=badge_large)