diff --git a/.github/workflows/build-and-deploy-snapshot.yml b/.github/workflows/build-and-deploy-snapshot.yml
index 36107b2246..de602f8fd6 100644
--- a/.github/workflows/build-and-deploy-snapshot.yml
+++ b/.github/workflows/build-and-deploy-snapshot.yml
@@ -8,7 +8,7 @@ concurrency:
 jobs:
   build-and-deploy-snapshot:
     name: Build and Deploy Snapshot
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_MEDIUM || 'ubuntu-latest' }}
     if: ${{ github.repository == 'spring-projects/spring-boot' }}
     steps:
       - name: Check Out Code
diff --git a/.github/workflows/build-pull-request.yml b/.github/workflows/build-pull-request.yml
index 04cc8240b1..96667f8684 100644
--- a/.github/workflows/build-pull-request.yml
+++ b/.github/workflows/build-pull-request.yml
@@ -7,7 +7,7 @@ permissions:
 jobs:
   build:
     name: Build Pull Request
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_MEDIUM || 'ubuntu-latest' }}
     if: ${{ github.repository == 'spring-projects/spring-boot' }}
     steps:
       - name: Free Disk Space
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d879b0a51e..f74c05920f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - id: ubuntu-latest
+          - id: ${{ vars.UBUNTU_MEDIUM || 'ubuntu-latest' }}
             name: Linux
           - id: windows-latest
             name: Windows
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1ec4857061..058c1492ff 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -8,7 +8,7 @@ concurrency:
 jobs:
   build-and-stage-release:
     name: Build and Stage Release
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_MEDIUIM || 'ubuntu-latest' }}
     if: ${{ github.repository == 'spring-projects/spring-boot' }}
     steps:
       - name: Check Out Code
@@ -49,7 +49,7 @@ jobs:
     needs:
       - build-and-stage-release
       - verify
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -66,7 +66,7 @@ jobs:
     needs:
       - build-and-stage-release
       - sync-to-maven-central
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Set up JFrog CLI
         uses: jfrog/setup-jfrog-cli@9fe0f98bd45b19e6e931d457f4e98f8f84461fb5 # v4.4.1
@@ -79,7 +79,7 @@ jobs:
     needs:
       - build-and-stage-release
       - sync-to-maven-central
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -95,7 +95,7 @@ jobs:
     needs:
       - build-and-stage-release
       - sync-to-maven-central
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -111,7 +111,7 @@ jobs:
     needs:
       - build-and-stage-release
       - sync-to-maven-central
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -128,7 +128,7 @@ jobs:
       - publish-gradle-plugin
       - publish-to-sdkman
       - update-homebrew-tap
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
diff --git a/.github/workflows/run-system-tests.yml b/.github/workflows/run-system-tests.yml
index ad1c21b16f..dcd426b07d 100644
--- a/.github/workflows/run-system-tests.yml
+++ b/.github/workflows/run-system-tests.yml
@@ -8,7 +8,7 @@ concurrency:
 jobs:
   run-system-tests:
     name: 'Java ${{ matrix.java.version}}'
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_MEDIUM || 'ubuntu-latest' }}
     if: ${{ github.repository == 'spring-projects/spring-boot' }}
     strategy:
       matrix:
diff --git a/.github/workflows/trigger-docs-build.yml b/.github/workflows/trigger-docs-build.yml
index 520e126de5..686f168c25 100644
--- a/.github/workflows/trigger-docs-build.yml
+++ b/.github/workflows/trigger-docs-build.yml
@@ -8,7 +8,7 @@ permissions:
 jobs:
   trigger-docs-build:
     name: Trigger Docs Build
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     if: github.repository_owner == 'spring-projects'
     steps:
     - name: Check Out
diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index 01cd02e973..ca8b9fb09e 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -21,7 +21,7 @@ on:
 jobs:
   verify:
     name: Verify
-    runs-on: ubuntu-latest
+    runs-on: ${{ vars.UBUNTU_SMALL || 'ubuntu-latest' }}
     steps:
       - name: Check Out Release Verification Tests
         uses: actions/checkout@v4