diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 828afc5..562f460 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -8,6 +8,7 @@ jobs:
         ruby-version:
           - "2.6"
           - "2.7"
+          - "3.0"
           - "jruby-9.3.10.0"
     steps:
       - uses: actions/checkout@v3
diff --git a/.ruby-version b/.ruby-version
index 860487c..eca690e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.1
+3.0.5