diff --git a/packages/core/src/core/contentGenerator.test.ts b/packages/core/src/core/contentGenerator.test.ts
index 74e20e73d4..9b7c3ac802 100644
--- a/packages/core/src/core/contentGenerator.test.ts
+++ b/packages/core/src/core/contentGenerator.test.ts
@@ -18,6 +18,7 @@ import { LoggingContentGenerator } from './loggingContentGenerator.js';
 import { loadApiKey } from './apiKeyCredentialStorage.js';
 import { FakeContentGenerator } from './fakeContentGenerator.js';
 import { RecordingContentGenerator } from './recordingContentGenerator.js';
+import { resetVersionCache } from '../utils/version.js';
 
 vi.mock('../code_assist/codeAssist.js');
 vi.mock('@google/genai');
@@ -35,6 +36,7 @@ const mockConfig = {
 
 describe('createContentGenerator', () => {
   beforeEach(() => {
+    resetVersionCache();
     vi.clearAllMocks();
   });
 
diff --git a/packages/core/src/utils/version.test.ts b/packages/core/src/utils/version.test.ts
index 775860b629..94a6f5c7c9 100644
--- a/packages/core/src/utils/version.test.ts
+++ b/packages/core/src/utils/version.test.ts
@@ -5,7 +5,7 @@
  */
 
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { getVersion } from './version.js';
+import { getVersion, resetVersionCache } from './version.js';
 import { getPackageJson } from './package.js';
 
 vi.mock('./package.js', () => ({
@@ -17,6 +17,8 @@ describe('version', () => {
 
   beforeEach(() => {
     vi.resetModules();
+    vi.clearAllMocks();
+    resetVersionCache();
     process.env = { ...originalEnv };
     vi.mocked(getPackageJson).mockResolvedValue({ version: '1.0.0' });
   });
@@ -43,4 +45,20 @@ describe('version', () => {
     const version = await getVersion();
     expect(version).toBe('unknown');
   });
+
+  it('should cache the version and only call getPackageJson once', async () => {
+    delete process.env['CLI_VERSION'];
+    vi.mocked(getPackageJson).mockResolvedValue({ version: '1.2.3' });
+
+    const version1 = await getVersion();
+    expect(version1).toBe('1.2.3');
+    expect(getPackageJson).toHaveBeenCalledTimes(1);
+
+    // Change the mock value to simulate an update on disk
+    vi.mocked(getPackageJson).mockResolvedValue({ version: '2.0.0' });
+
+    const version2 = await getVersion();
+    expect(version2).toBe('1.2.3'); // Should still be the cached version
+    expect(getPackageJson).toHaveBeenCalledTimes(1); // Should not have been called again
+  });
 });
diff --git a/packages/core/src/utils/version.ts b/packages/core/src/utils/version.ts
index ecd7a8b503..53e8b7d569 100644
--- a/packages/core/src/utils/version.ts
+++ b/packages/core/src/utils/version.ts
@@ -11,7 +11,20 @@ import path from 'node:path';
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
 
-export async function getVersion(): Promise<string> {
-  const pkgJson = await getPackageJson(__dirname);
-  return process.env['CLI_VERSION'] || pkgJson?.version || 'unknown';
+let versionPromise: Promise<string> | undefined;
+
+export function getVersion(): Promise<string> {
+  if (versionPromise) {
+    return versionPromise;
+  }
+  versionPromise = (async () => {
+    const pkgJson = await getPackageJson(__dirname);
+    return process.env['CLI_VERSION'] || pkgJson?.version || 'unknown';
+  })();
+  return versionPromise;
+}
+
+/** For testing purposes only */
+export function resetVersionCache(): void {
+  versionPromise = undefined;
 }