diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index df59b6c..c8a6652 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -20,6 +20,7 @@ jobs:
           - "11"
           - "16"
           - "17"
+          - "21"
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
diff --git a/README.md b/README.md
index 16beffb..a906362 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,13 @@ Version `1.17` (not `1.17.X`) is only executable with Java 16 (no LTS).
 
 ### JDK-17
 - 1.17.1
+- 1.18
+- 1.19
+- 1.20
+
+### JDK-21
+- 1.20
+- 1.21
 
 ## Build Caching?