diff --git a/README.md b/README.md
index 2a33308..8763a6d 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ steps:
 
 #### Supported version syntax
 The `java-version` input supports an exact version or a version range using [SemVer](https://semver.org/) notation:
-- major versions: `8`, `11`, `16`, `17`
+- major versions: `8`, `11`, `16`, `17`, `21`
 - more specific versions: `17.0`, `11.0`, `11.0.4`, `8.0.232`, `8.0.282+8`
 - early access (EA) versions: `15-ea`, `15.0.0-ea`, `15.0.0-ea.2`, `15.0.0+2-ea`
 
diff --git a/__tests__/distributors/oracle-installer.test.ts b/__tests__/distributors/oracle-installer.test.ts
index ad16eca..356c0c6 100644
--- a/__tests__/distributors/oracle-installer.test.ts
+++ b/__tests__/distributors/oracle-installer.test.ts
@@ -22,6 +22,11 @@ describe('findPackageForDownload', () => {
   });
 
   it.each([
+    [
+      '21',
+      '21',
+      'https://download.oracle.com/java/21/latest/jdk-21_{{OS_TYPE}}-x64_bin.{{ARCHIVE_TYPE}}'
+    ],
     [
       '20',
       '20',
diff --git a/docs/advanced-usage.md b/docs/advanced-usage.md
index e13366d..48aecfd 100644
--- a/docs/advanced-usage.md
+++ b/docs/advanced-usage.md
@@ -121,7 +121,7 @@ steps:
 - uses: actions/setup-java@v3
   with:
     distribution: 'oracle'
-    java-version: '17'
+    java-version: '21'
 - run: java -cp java HelloWorldApp
 ```