diff --git a/_faqs/how-to-specify-backend-java-ci.md b/_faqs/how-to-specify-backend-java-ci.md
index b0e59e7f..a5f76a41 100644
--- a/_faqs/how-to-specify-backend-java-ci.md
+++ b/_faqs/how-to-specify-backend-java-ci.md
@@ -13,7 +13,7 @@ For the few front-end modules that still use Jenkins build rather than GitHub Wo
 
 ## Using Java 17
 
-For projects that use Java 17:
+For projects that use Java 17 (as at 2024-10-10 this is the default):
 
 * In [Jenkinsfile](/guides/jenkinsfile/), declare this in the "buildMvn" section:\
   `buildNode = 'jenkins-agent-java17'`
@@ -22,24 +22,25 @@ For projects that use Java 17:
   `FROM folioci/alpine-jre-openjdk17:latest`
 * See other notes (e.g. POM file, and dependencies, and wget example) at Wiki [JDK 17 and Java 17](https://folio-org.atlassian.net/wiki/x/Th9N).
 
-## Using Java 11
+## Using Java 21
 
-For some projects that use Java 11 (there should now not be any):
+For projects that use Java 21:
 
 * In [Jenkinsfile](/guides/jenkinsfile/), declare this in the "buildMvn" section:\
-  `buildNode = 'jenkins-agent-java11'`
+  `buildNode = 'jenkins-agent-java21'`
+* In [Jenkinsfile](/guides/jenkinsfile/), declare the mandatory module heath check endpoint via the Docker command `healthChkCmd` to use 'wget'. (There is no 'curl' available on the base image.) 
 * In Dockerfile, use:\
-  `FROM folioci/alpine-jre-openjdk11:latest`
-* Additional [upgrade notes](https://github.com/folio-org/raml-module-builder/blob/master/doc/upgrading.md#version-310) for projects based on RAML Module Builder (RMB).
+  `FROM folioci/alpine-jre-openjdk21:latest`
+* See other notes (e.g. POM file, and dependencies, and wget example) at Wiki [JDK 17 and Java 17](https://folio-org.atlassian.net/wiki/x/Th9N).
 
 ## Not using buildMvn pipeline
 
-As some Java-based projects do not use the "buildMvn" pipeline, they can specify the agent node in their Jenkinsfile (either `'jenkins-agent-java17'` or `'jenkins-agent-java11'`) e.g.:
+As some Java-based projects do not use the "buildMvn" pipeline, they can specify the agent node in their Jenkinsfile (either `'jenkins-agent-java17'` or `'jenkins-agent-java21'`) e.g.:
 
 ```
 agent {
   node {
-    label 'jenkins-agent-java11'
+    label 'jenkins-agent-java17'
   }
 }
 ```
@@ -48,7 +49,7 @@ agent {
 
 For the few front-end projects that still use Jenkins build rather than GitHub Workflows, the buildNode provides the relevant Nodejs version:
 
-For projects that now use Nodejs 16:
+For projects that use Nodejs 18:
 
 * In [Jenkinsfile](/guides/jenkinsfile/), declare this in the "buildNPM" section:\
   `buildNode = 'jenkins-agent-java17'`
@@ -58,6 +59,16 @@ For projects that still use Nodejs 14:
 * In [Jenkinsfile](/guides/jenkinsfile/), declare this in the "buildNPM" section:\
   `buildNode = 'jenkins-agent-java11'`
 
+## Using deprecated Java 11
+
+For some projects that use Java 11 (there should now not be any):
+
+* In [Jenkinsfile](/guides/jenkinsfile/), declare this in the "buildMvn" section:\
+  `buildNode = 'jenkins-agent-java11'`
+* In Dockerfile, use:\
+  `FROM folioci/alpine-jre-openjdk11:latest`
+* Additional [upgrade notes](https://github.com/folio-org/raml-module-builder/blob/master/doc/upgrading.md#version-310) for projects based on RAML Module Builder (RMB).
+
 ## Using deprecated Java 8
 
 **Note:** FOLIO modules can no longer use the deprecated Java 8 facilities ([FOLIO-2926](https://issues.folio.org/browse/FOLIO-2926)).
diff --git a/guides/jenkinsfile.md b/guides/jenkinsfile.md
index f1fe5fd6..59fc351b 100644
--- a/guides/jenkinsfile.md
+++ b/guides/jenkinsfile.md
@@ -46,8 +46,9 @@ buildMvn {
 ```
 
 * `buildNode` -- The Jenkins node to run the CI build.
-The default is `'jenkins-agent-java11'` if not specified.
-The other available option is `'jenkins-agent-java17'`.
+The default is `'jenkins-agent-java17'` if not specified.
+The other available option is `'jenkins-agent-java21'`.
+See FAQ [How to specify which Jenkins build image for CI](/faqs/how-to-specify-backend-java-ci/).
 * `publishModDescriptor` -- Maven-based modules will generate the ModuleDescriptor.json file as
 [explained](/guides/commence-a-module/#back-end-descriptors).
 It will be published to the FOLIO Module Descriptor registry.
diff --git a/guides/module-descriptor.md b/guides/module-descriptor.md
index 7d6d598a..46b58d96 100644
--- a/guides/module-descriptor.md
+++ b/guides/module-descriptor.md
@@ -177,7 +177,7 @@ This environment variable must at least have the setting as shown in the [exampl
 
 <a id="dockerfile"></a>The module's Dockerfile needs to use a base image that has the feature "UseContainerSupport". Use that feature in conjunction with "MaxRAMPercentage".
 
-Note that all Java-based modules should now be [using Java 17](/faqs/how-to-specify-backend-java-ci/).
+Note that all Java-based modules should now be [using Java 21 or Java 17](/faqs/how-to-specify-backend-java-ci/).
 
 Other necessary options can be appended (e.g. -XX:+PrintFlagsFinal).