diff --git a/.github/actions/update-project-versions/__tests__/index.test.js b/.github/actions/update-project-versions/__tests__/index.test.js
index 0411ae4..70d156d 100644
--- a/.github/actions/update-project-versions/__tests__/index.test.js
+++ b/.github/actions/update-project-versions/__tests__/index.test.js
@@ -297,6 +297,28 @@ describe('updateBuildGradleContent', () => {
     expect(updated).toContain(`description = 'My project'`);
   });
 
+  it('updates springCloudVersion declared with set() in an ext block', () => {
+    const content = `ext {\n\tset('springCloudVersion', "2024.0.1-SNAPSHOT")\n}\n`;
+    const { updated, updatedProperties } = updateBuildGradleContent(
+      content, '4.2.9', { 'spring-cloud': '2024.0.9' });
+    expect(updated).toBe(`ext {\n\tset('springCloudVersion', "2024.0.9")\n}\n`);
+    expect(updatedProperties).toEqual(['springCloudVersion: 2024.0.9']);
+  });
+
+  it('handles set() with either quote style and spacing', () => {
+    const content = `ext {\n  set( "springCloudVersion" , 'x' )\n}\n`;
+    const { updated } = updateBuildGradleContent(content, '4.2.9', { 'spring-cloud': '2024.0.9' });
+    expect(updated).toBe(`ext {\n  set( "springCloudVersion" , '2024.0.9' )\n}\n`);
+  });
+
+  it('leaves set() of a key that is not a project version alone', () => {
+    const content = `ext {\n\tset('javaVersion', "17")\n\tset('springCloudVersion', "2024.0.9")\n}\n`;
+    const { updated, updatedProperties } = updateBuildGradleContent(
+      content, '4.2.9', { 'spring-cloud': '2024.0.9' });
+    expect(updated).toBe(content);
+    expect(updatedProperties).toEqual([]);
+  });
+
   // spring-cloud-function's Gradle samples declare these in an ext block rather than in
   // gradle.properties, so a release used to leave them at whatever they had been pinned at
   // - Boot 2.1.0.BUILD-SNAPSHOT in a train releasing against Boot 4.
diff --git a/.github/actions/update-project-versions/dist/index.js b/.github/actions/update-project-versions/dist/index.js
index a908286..3972def 100644
--- a/.github/actions/update-project-versions/dist/index.js
+++ b/.github/actions/update-project-versions/dist/index.js
@@ -28857,20 +28857,36 @@ function updateBuildGradleContent(content, projectVersion, versions = {}) {
   //
   // A key that resolves to no project is left alone, which is what keeps `javaVersion` and
   // similar build settings out of it.
+  //
+  // Two spellings of the same extra property are recognised:
+  //   springCloudVersion = "2024.0.1-SNAPSHOT"
+  //   set('springCloudVersion', "2024.0.1-SNAPSHOT")      <- what start.spring.io generates
   const updatedProperties = [];
+  const ASSIGNMENT = /^(\s*)([a-zA-Z][a-zA-Z0-9]*Version)(\s*=\s*)(['"])([^'"]+)(['"])(.*)$/;
+  const SET_CALL = /^(\s*set\(\s*)(['"])([a-zA-Z][a-zA-Z0-9]*Version)(['"])(\s*,\s*)(['"])([^'"]+)(['"])(.*)$/;
   const updated = withProjectVersion.split('\n').map((line) => {
-    const match = line.match(
-      /^(\s*)([a-zA-Z][a-zA-Z0-9]*Version)(\s*=\s*)(['"])([^'"]+)(['"])(.*)$/
-    );
-    if (!match) return line;
+    let key, currentValue, rewrite;
+    let match = line.match(ASSIGNMENT);
+    if (match) {
+      const [, indent, k, separator, openQuote, value, closeQuote, trailing] = match;
+      key = k;
+      currentValue = value;
+      rewrite = v => `${indent}${k}${separator}${openQuote}${v}${closeQuote}${trailing}`;
+    } else if ((match = line.match(SET_CALL))) {
+      const [, head, keyOpen, k, keyClose, comma, openQuote, value, closeQuote, trailing] = match;
+      key = k;
+      currentValue = value;
+      rewrite = v => `${head}${keyOpen}${k}${keyClose}${comma}${openQuote}${v}${closeQuote}${trailing}`;
+    } else {
+      return line;
+    }
 
-    const [, indent, key, separator, openQuote, currentValue, closeQuote, trailing] = match;
     const projectName = camelToKebab(key.slice(0, -'Version'.length));
     const targetVersion = versions[projectName];
     if (!targetVersion || currentValue === targetVersion) return line;
 
     updatedProperties.push(`${key}: ${targetVersion}`);
-    return `${indent}${key}${separator}${openQuote}${targetVersion}${closeQuote}${trailing}`;
+    return rewrite(targetVersion);
   }).join('\n');
 
   // Inline dependency coordinates - "group:artifact:version" - for artifacts this train
diff --git a/.github/actions/update-project-versions/src/index.js b/.github/actions/update-project-versions/src/index.js
index d0db3e5..81a732d 100644
--- a/.github/actions/update-project-versions/src/index.js
+++ b/.github/actions/update-project-versions/src/index.js
@@ -632,20 +632,36 @@ function updateBuildGradleContent(content, projectVersion, versions = {}) {
   //
   // A key that resolves to no project is left alone, which is what keeps `javaVersion` and
   // similar build settings out of it.
+  //
+  // Two spellings of the same extra property are recognised:
+  //   springCloudVersion = "2024.0.1-SNAPSHOT"
+  //   set('springCloudVersion', "2024.0.1-SNAPSHOT")      <- what start.spring.io generates
   const updatedProperties = [];
+  const ASSIGNMENT = /^(\s*)([a-zA-Z][a-zA-Z0-9]*Version)(\s*=\s*)(['"])([^'"]+)(['"])(.*)$/;
+  const SET_CALL = /^(\s*set\(\s*)(['"])([a-zA-Z][a-zA-Z0-9]*Version)(['"])(\s*,\s*)(['"])([^'"]+)(['"])(.*)$/;
   const updated = withProjectVersion.split('\n').map((line) => {
-    const match = line.match(
-      /^(\s*)([a-zA-Z][a-zA-Z0-9]*Version)(\s*=\s*)(['"])([^'"]+)(['"])(.*)$/
-    );
-    if (!match) return line;
+    let key, currentValue, rewrite;
+    let match = line.match(ASSIGNMENT);
+    if (match) {
+      const [, indent, k, separator, openQuote, value, closeQuote, trailing] = match;
+      key = k;
+      currentValue = value;
+      rewrite = v => `${indent}${k}${separator}${openQuote}${v}${closeQuote}${trailing}`;
+    } else if ((match = line.match(SET_CALL))) {
+      const [, head, keyOpen, k, keyClose, comma, openQuote, value, closeQuote, trailing] = match;
+      key = k;
+      currentValue = value;
+      rewrite = v => `${head}${keyOpen}${k}${keyClose}${comma}${openQuote}${v}${closeQuote}${trailing}`;
+    } else {
+      return line;
+    }
 
-    const [, indent, key, separator, openQuote, currentValue, closeQuote, trailing] = match;
     const projectName = camelToKebab(key.slice(0, -'Version'.length));
     const targetVersion = versions[projectName];
     if (!targetVersion || currentValue === targetVersion) return line;
 
     updatedProperties.push(`${key}: ${targetVersion}`);
-    return `${indent}${key}${separator}${openQuote}${targetVersion}${closeQuote}${trailing}`;
+    return rewrite(targetVersion);
   }).join('\n');
 
   // Inline dependency coordinates - "group:artifact:version" - for artifacts this train