diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dacb05ced..f05e08302 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -191,9 +191,7 @@ jobs:
           # We want to enable preview features when testing newer builds of OpenJDK:
           # even if we don't use these features, just enabling them can cause side effects
           # and it's useful to test that.
-          - { name: "20", java_version_numeric: 20, jvm_args: '--enable-preview' }
           - { name: "21", java_version_numeric: 21, jvm_args: '--enable-preview' }
-          - { name: "24", java_version_numeric: 24, jvm_args: '--enable-preview' }
           - { name: "25", java_version_numeric: 25, from: 'jdk.java.net', jvm_args: '--enable-preview' }
           - { name: "26-ea", java_version_numeric: 26, from: 'jdk.java.net', jvm_args: '--enable-preview' }
     steps:
diff --git a/.github/workflows/scheduler.yml b/.github/workflows/scheduler.yml
index 54103540e..ae678b15d 100644
--- a/.github/workflows/scheduler.yml
+++ b/.github/workflows/scheduler.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        branch: [ 'wip/2.4', 'wip/3.0', 'wip/3.1', 'wip/3.2', 'wip/4.0', 'wip/4.1', 'wip/4.2' ]
+        branch: [ 'wip/2.4', 'wip/3.1', 'wip/3.2', 'wip/4.1', 'wip/4.2' ]
     uses: ./.github/workflows/build.yml
     with:
       branch: ${{ matrix.branch }}