diff --git a/Jenkinsfile b/Jenkinsfile
index 36edc95..14784e9 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -73,11 +73,11 @@ def upstreamProjects = [
  *                      Defaults to '17'                                                  *
  *                                                                                        *
  * buildJdks            The array of JDK versions that will build.                        *
- *                      Defaults to ['11', '17', '19']                                    *
+ *                      Defaults to ['11', '17', '20']                                    *
  *                      Changes must be copied to matrix axes!                            *
  *                                                                                        *
  * testJdks             The array of JDK versions that will test against every build JDK. *
- *                      Defaults to ['11', '17', '19']                                    *
+ *                      Defaults to ['11', '17', '20']                                    *
  *                      Changes must be copied to matrix axes!                            *
  *                                                                                        *
  * upstreamProjects     The array of relative paths to upstream projects.                 *
@@ -172,13 +172,13 @@ if (!binding.hasVariable('deployJdk')) {
 if (!binding.hasVariable('buildJdks')) {
   binding.setVariable(
     'buildJdks',
-    ['11', '17', '19'] // Changes must be copied to matrix axes!
+    ['11', '17', '20'] // Changes must be copied to matrix axes!
   )
 }
 if (!binding.hasVariable('testJdks')) {
   binding.setVariable(
     'testJdks',
-    ['11', '17', '19'] // Changes must be copied to matrix axes!
+    ['11', '17', '20'] // Changes must be copied to matrix axes!
   )
 }
 if (!binding.hasVariable('upstreamProjects')) {
@@ -786,7 +786,7 @@ pipeline {
         axes {
           axis {
             name 'jdk'
-            values '11', '17', '19' // buildJdks
+            values '11', '17', '20' // buildJdks
           }
         }
         stages {
@@ -832,11 +832,11 @@ pipeline {
         axes {
           axis {
             name 'jdk'
-            values '11', '17', '19' // buildJdks
+            values '11', '17', '20' // buildJdks
           }
           axis {
             name 'testJdk'
-            values '11', '17', '19' // testJdks
+            values '11', '17', '20' // testJdks
           }
         }
         stages {
diff --git a/book/Jenkinsfile b/book/Jenkinsfile
index 4f69c1b..938f400 100644
--- a/book/Jenkinsfile
+++ b/book/Jenkinsfile
@@ -70,11 +70,11 @@ def upstreamProjects = [
  *                      Defaults to '17'                                                  *
  *                                                                                        *
  * buildJdks            The array of JDK versions that will build.                        *
- *                      Defaults to ['11', '17', '19']                                    *
+ *                      Defaults to ['11', '17', '20']                                    *
  *                      Changes must be copied to matrix axes!                            *
  *                                                                                        *
  * testJdks             The array of JDK versions that will test against every build JDK. *
- *                      Defaults to ['11', '17', '19']                                    *
+ *                      Defaults to ['11', '17', '20']                                    *
  *                      Changes must be copied to matrix axes!                            *
  *                                                                                        *
  * upstreamProjects     The array of relative paths to upstream projects.                 *
@@ -169,13 +169,13 @@ if (!binding.hasVariable('deployJdk')) {
 if (!binding.hasVariable('buildJdks')) {
   binding.setVariable(
     'buildJdks',
-    ['11', '17', '19'] // Changes must be copied to matrix axes!
+    ['11', '17', '20'] // Changes must be copied to matrix axes!
   )
 }
 if (!binding.hasVariable('testJdks')) {
   binding.setVariable(
     'testJdks',
-    ['11', '17', '19'] // Changes must be copied to matrix axes!
+    ['11', '17', '20'] // Changes must be copied to matrix axes!
   )
 }
 if (!binding.hasVariable('upstreamProjects')) {
@@ -783,7 +783,7 @@ pipeline {
         axes {
           axis {
             name 'jdk'
-            values '11', '17', '19' // buildJdks
+            values '11', '17', '20' // buildJdks
           }
         }
         stages {
@@ -829,11 +829,11 @@ pipeline {
         axes {
           axis {
             name 'jdk'
-            values '11', '17', '19' // buildJdks
+            values '11', '17', '20' // buildJdks
           }
           axis {
             name 'testJdk'
-            values '11', '17', '19' // testJdks
+            values '11', '17', '20' // testJdks
           }
         }
         stages {