diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bef16dc..9ff9b81 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,7 @@ jobs:
         - Node.js 18.x
         - Node.js 19.x
         - Node.js 20.x
+        - Node.js 21.x
 
         include:
         - name: Node.js 0.10
@@ -120,6 +121,9 @@ jobs:
         - name: Node.js 20.x
           node-version: "20.11"
 
+        - name: Node.js 21.x
+          node-version: "21.6"
+
     steps:
     - uses: actions/checkout@v4