Update README.md

Author: sigpwned

README.md

@@ -1,20 +1,20 @@
 # AWS Lambda Java Base Images
 
-This project provides the missing [AWS Lambda base image](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-images.html) for Java 17, 18, 19, and 20. The base images are publicly available [in the ECR Public Gallery](https://gallery.ecr.aws/aleph0io/lambda/java). You should be able to use them directly in your builds. I use these images in production for personal and commercial projects today, but per the license, there is no warranty, and YMMV.
+This project provides the missing [AWS Lambda base image](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-images.html) for Java 17, 18, 19, 20, and 21. The base images are publicly available [in the ECR Public Gallery](https://gallery.ecr.aws/aleph0io/lambda/java). You should be able to use them directly in your builds. I use these images in production for personal and commercial projects today, but per the license, there is no warranty, and YMMV.
 
 ## Approach
 
 This project uses the following process to create new Lambda base images:
 
 1. Define a Java maven POM that includes all the [Java Lambda support libraries](https://github.com/aws/aws-lambda-java-libs) as provided scope. This roundabout approach is used to coax @dependabot into flagging new versions as they are published.
-2. Also teach maven to collect these dependencies and build the appropriate docker images using the Dockerfile using the excellent [fabric8io/docker-maven-plugin](https://github.com/fabric8io/docker-maven-plugin).
-3. Use GitHub Actions to do perform CI/CD and release new images to the ECR Public Gallery.
+2. Also teach maven to collect these dependencies and build the appropriate docker images using a Dockerfile and the excellent [fabric8io/docker-maven-plugin](https://github.com/fabric8io/docker-maven-plugin).
+3. Use GitHub Actions to perform CI/CD and release new images to the ECR Public Gallery.
 
 ## Example Lambda Function
 
-You can find an example Lambda function using these base images at [aleph0io/example-java-lambda-function](https://github.com/aleph0io/example-java-lambda-function). It's just like building any container lambda function. For ease of use, find the `Dockerfile` below. Note the `FROM` image. Java versions 18-20 are also supported.
+You can find an example Lambda function using these base images at [aleph0io/example-java-lambda-function](https://github.com/aleph0io/example-java-lambda-function). It's just like building any container lambda function. For ease of use, find the `Dockerfile` below. Note the `FROM` image. Java versions 18-21 are also supported.
 
-    FROM public.ecr.aws/aleph0io/java/lambda:17.0.4-al2
+    FROM public.ecr.aws/aleph0io/java/lambda:21-al2
 
     COPY target/hello-lambda.jar "${LAMBDA_TASK_ROOT}/lib/"
 
@@ -27,14 +27,14 @@ The [Lambda RIE](https://github.com/aws/aws-lambda-runtime-interface-emulator) i
 ## Known Issues and Future Plans
 
 * This image is in no way optimized for cold start time, size, etc. PRs welcome!
-* Java 17, 18, 19, and 20 are all supported.
+* Java 17, 18, 19, 20, and 21 are all supported.
 * For now, only x86_64 is supported. I hope to publish multiarch builds including arm64 soon.
-* Java 17 preview base images have been released to [lambda/java](https://gallery.ecr.aws/lambda/java). Java 17 users should strongly consider moving to the officially-supported base images, especially once they leave preview.
+* Official base images for Java 17 have been released to [lambda/java](https://gallery.ecr.aws/lambda/java). Java 17 users should strongly consider moving to the officially-supported base images. This project will continue to release updates for Java 17 on an ongoing basis for those who prefer not to move.
 * This project will continue to support non-LTS Java versions that will never receive an officially-supported AWS Lambda base image.
 
 ## More Information
 
-You can find writeups of the [Java 17](https://sigpwned.com/2022/07/23/aws-lambda-base-images-for-java-17/), [18](https://sigpwned.com/2022/08/31/aws-lambda-base-images-for-java-18-too/), [19](https://sigpwned.com/2022/09/21/aws-lambda-base-images-for-java-19/), and [20](https://sigpwned.com/2023/03/24/community-managed-aws-lambda-base-images-for-java-20/) on [my blog](https://sigpwned.com/).
+You can find writeups of the [Java 17](https://sigpwned.com/2022/07/23/aws-lambda-base-images-for-java-17/), [18](https://sigpwned.com/2022/08/31/aws-lambda-base-images-for-java-18-too/), [19](https://sigpwned.com/2022/09/21/aws-lambda-base-images-for-java-19/), [20](https://sigpwned.com/2023/03/24/community-managed-aws-lambda-base-images-for-java-20/), and [21](https://sigpwned.com/2023/09/19/java-21-custom-runtime-for-aws-lambda/) on [my blog](https://sigpwned.com/).
 
 ## Acknowledgements