diff --git a/src/commands/update-command.ts b/src/commands/update-command.ts
index a85a38a3..4346df7c 100644
--- a/src/commands/update-command.ts
+++ b/src/commands/update-command.ts
@@ -26,15 +26,81 @@ export interface UpdateOptions {
   beta?: boolean;
 }
 
-// Version (from centralized utility)
-const CCS_VERSION = getVersion();
+type TargetTag = 'latest' | 'dev';
+
+type UpdateCheckResult =
+  | {
+      status: 'update_available';
+      current?: string;
+      latest?: string;
+      message?: string;
+      reason?: string;
+    }
+  | {
+      status: 'check_failed';
+      message?: string;
+      latest?: string;
+      current?: string;
+      reason?: string;
+    }
+  | {
+      status: 'no_update';
+      reason?: string;
+      latest?: string;
+      current?: string;
+      message?: string;
+    };
+
+export interface UpdateCommandDeps {
+  initUI: typeof initUI;
+  getVersion: typeof getVersion;
+  detectCurrentInstall: typeof detectCurrentInstall;
+  buildPackageManagerEnv: typeof buildPackageManagerEnv;
+  formatManualUpdateCommand: typeof formatManualUpdateCommand;
+  readInstalledPackageState: typeof readInstalledPackageState;
+  compareVersionsWithPrerelease: typeof compareVersionsWithPrerelease;
+  checkForUpdates: (
+    currentVersion: string,
+    interactive: boolean,
+    channel: 'npm' | 'direct',
+    targetTag: TargetTag
+  ) => Promise<UpdateCheckResult>;
+  spawn: typeof spawn;
+}
+
+async function loadCheckForUpdates(
+  currentVersion: string,
+  interactive: boolean,
+  channel: 'npm' | 'direct',
+  targetTag: TargetTag
+): Promise<UpdateCheckResult> {
+  const { checkForUpdates } = await import('../utils/update-checker');
+  return checkForUpdates(
+    currentVersion,
+    interactive,
+    channel,
+    targetTag
+  ) as Promise<UpdateCheckResult>;
+}
+
+const defaultDeps: UpdateCommandDeps = {
+  initUI,
+  getVersion,
+  detectCurrentInstall,
+  buildPackageManagerEnv,
+  formatManualUpdateCommand,
+  readInstalledPackageState,
+  compareVersionsWithPrerelease,
+  checkForUpdates: loadCheckForUpdates,
+  spawn,
+};
 
 async function resolveTargetVersion(
   currentVersion: string,
-  targetTag: 'latest' | 'dev'
+  targetTag: TargetTag,
+  deps: UpdateCommandDeps
 ): Promise<string | undefined> {
-  const { checkForUpdates } = await import('../utils/update-checker');
-  const result = await checkForUpdates(currentVersion, true, 'npm', targetTag);
+  const result = await deps.checkForUpdates(currentVersion, true, 'npm', targetTag);
 
   if (result.status === 'update_available' && result.latest) {
     return result.latest;
@@ -47,15 +113,16 @@ async function resolveTargetVersion(
   return undefined;
 }
 
-/**
- * Handle the update command
- * Checks for updates and installs the latest version
- */
-export async function handleUpdateCommand(options: UpdateOptions = {}): Promise<void> {
-  await initUI();
+export async function handleUpdateCommand(
+  options: UpdateOptions = {},
+  injectedDeps: Partial<UpdateCommandDeps> = {}
+): Promise<void> {
+  const deps = { ...defaultDeps, ...injectedDeps };
+  await deps.initUI();
   const { force = false, beta = false } = options;
-  const targetTag = beta ? 'dev' : 'latest';
-  const currentInstall = detectCurrentInstall();
+  const targetTag: TargetTag = beta ? 'dev' : 'latest';
+  const currentInstall = deps.detectCurrentInstall();
+  const currentVersion = deps.getVersion();
 
   console.log('');
   console.log(header('Checking for updates...'));
@@ -65,16 +132,20 @@ export async function handleUpdateCommand(options: UpdateOptions = {}): Promise<
   if (force) {
     console.log(info(`Force reinstall from @${targetTag} channel...`));
     console.log('');
-    const expectedVersion = await resolveTargetVersion(CCS_VERSION, targetTag);
-    await performNpmUpdate(currentInstall, targetTag, true, expectedVersion);
+    const expectedVersion = await resolveTargetVersion(currentVersion, targetTag, deps);
+    await performNpmUpdate(currentInstall, targetTag, true, expectedVersion, deps);
     return;
   }
 
-  const { checkForUpdates } = await import('../utils/update-checker');
-  const updateResult = await checkForUpdates(CCS_VERSION, true, 'npm', targetTag);
+  const updateResult = await deps.checkForUpdates(currentVersion, true, 'npm', targetTag);
 
   if (updateResult.status === 'check_failed') {
-    handleCheckFailed(updateResult.message ?? 'Update check failed', targetTag, currentInstall);
+    handleCheckFailed(
+      updateResult.message ?? 'Update check failed',
+      targetTag,
+      currentInstall,
+      deps
+    );
     return;
   }
 
@@ -91,7 +162,7 @@ export async function handleUpdateCommand(options: UpdateOptions = {}): Promise<
   const isDowngrade =
     updateResult.latest &&
     updateResult.current &&
-    compareVersionsWithPrerelease(updateResult.latest, updateResult.current) < 0;
+    deps.compareVersionsWithPrerelease(updateResult.latest, updateResult.current) < 0;
 
   // This happens when stable user requests @dev but @dev base is older
   if (isDowngrade && beta) {
@@ -115,7 +186,7 @@ export async function handleUpdateCommand(options: UpdateOptions = {}): Promise<
     console.log('');
   }
 
-  await performNpmUpdate(currentInstall, targetTag, false, updateResult.latest);
+  await performNpmUpdate(currentInstall, targetTag, false, updateResult.latest, deps);
 }
 
 /**
@@ -124,7 +195,8 @@ export async function handleUpdateCommand(options: UpdateOptions = {}): Promise<
 function handleCheckFailed(
   message: string,
   targetTag: string = 'latest',
-  currentInstall: CurrentInstall = detectCurrentInstall()
+  currentInstall: CurrentInstall = defaultDeps.detectCurrentInstall(),
+  deps: UpdateCommandDeps = defaultDeps
 ): void {
   console.log(fail(message));
   console.log('');
@@ -135,7 +207,7 @@ function handleCheckFailed(
   console.log('');
   console.log('Try again later or update manually:');
 
-  console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+  console.log(color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
   console.log('');
   process.exit(1);
 }
@@ -172,9 +244,10 @@ function verifyCurrentInstallVersion(
   targetTag: string,
   expectedVersion?: string,
   previousState?: InstalledPackageState,
-  isReinstall: boolean = false
+  isReinstall: boolean = false,
+  deps: UpdateCommandDeps = defaultDeps
 ): void {
-  const nextState = readInstalledPackageState(currentInstall);
+  const nextState = deps.readInstalledPackageState(currentInstall);
   const installedVersion = nextState.version;
   if (!installedVersion) {
     console.log('');
@@ -183,7 +256,7 @@ function verifyCurrentInstallVersion(
     );
     console.log('');
     console.log('Current install remains ambiguous. Re-run manually:');
-    console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+    console.log(color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
     console.log('');
     process.exit(1);
   }
@@ -199,7 +272,7 @@ function verifyCurrentInstallVersion(
       return;
     }
 
-    const comparison = compareVersionsWithPrerelease(installedVersion, expectedVersion);
+    const comparison = deps.compareVersionsWithPrerelease(installedVersion, expectedVersion);
     if (comparison < 0) {
       console.log('');
       console.log(
@@ -216,7 +289,9 @@ function verifyCurrentInstallVersion(
       }
       console.log('');
       console.log('Re-run manually against the current install:');
-      console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+      console.log(
+        color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command')
+      );
       console.log('');
       process.exit(1);
     }
@@ -236,7 +311,7 @@ function verifyCurrentInstallVersion(
     );
     console.log('');
     console.log('Re-run manually against the current install:');
-    console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+    console.log(color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
     console.log('');
     process.exit(1);
   }
@@ -246,15 +321,16 @@ async function performNpmUpdate(
   currentInstall: CurrentInstall,
   targetTag: string = 'latest',
   isReinstall: boolean = false,
-  expectedVersion?: string
+  expectedVersion?: string,
+  deps: UpdateCommandDeps = defaultDeps
 ): Promise<void> {
   const packageManager = currentInstall.manager;
   let updateCommand: string;
   let updateArgs: string[];
   let cacheCommand: string | null;
   let cacheArgs: string[] | null;
-  const childEnv = buildPackageManagerEnv(currentInstall);
-  const previousState = readInstalledPackageState(currentInstall);
+  const childEnv = deps.buildPackageManagerEnv(currentInstall);
+  const previousState = deps.readInstalledPackageState(currentInstall);
 
   switch (packageManager) {
     case 'npm':
@@ -300,12 +376,12 @@ async function performNpmUpdate(
     // Also suppress Node deprecation warnings that may come from package managers
     // Pipe stderr on Windows to filter npm cleanup warnings (EPERM on native modules)
     const child = isWindows
-      ? spawn(`${updateCommand} ${updateArgs.join(' ')}`, [], {
+      ? deps.spawn(`${updateCommand} ${updateArgs.join(' ')}`, [], {
           stdio: ['inherit', 'inherit', 'pipe'],
           shell: true,
           env: { ...childEnv, NODE_NO_WARNINGS: '1' },
         })
-      : spawn(updateCommand, updateArgs, { stdio: 'inherit', env: childEnv });
+      : deps.spawn(updateCommand, updateArgs, { stdio: 'inherit', env: childEnv });
 
     // On Windows, filter stderr to hide npm cleanup warnings (EPERM on bcrypt.node etc.)
     // These warnings are cosmetic - update succeeds despite file locking by antivirus/indexing
@@ -339,7 +415,8 @@ async function performNpmUpdate(
             targetTag,
             expectedVersion,
             previousState,
-            isReinstall
+            isReinstall,
+            deps
           );
         }
         console.log('');
@@ -353,7 +430,9 @@ async function performNpmUpdate(
         console.log(fail(`${isReinstall ? 'Reinstall' : 'Update'} failed`));
         console.log('');
         console.log('Try manually:');
-        console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+        console.log(
+          color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command')
+        );
         console.log('');
       }
       process.exit(code || 0);
@@ -364,7 +443,9 @@ async function performNpmUpdate(
       console.log(fail(`Failed to run ${packageManager} ${isReinstall ? 'reinstall' : 'update'}`));
       console.log('');
       console.log('Try manually:');
-      console.log(color(`  ${formatManualUpdateCommand(targetTag, currentInstall)}`, 'command'));
+      console.log(
+        color(`  ${deps.formatManualUpdateCommand(targetTag, currentInstall)}`, 'command')
+      );
       console.log('');
       process.exit(1);
     });
@@ -383,12 +464,12 @@ async function performNpmUpdate(
     console.log(info(stepMessage));
     // On Windows, use shell with full command string to avoid deprecation warning
     const cacheChild = isWindows
-      ? spawn(`${cacheCommand} ${cacheArgs.join(' ')}`, [], {
+      ? deps.spawn(`${cacheCommand} ${cacheArgs.join(' ')}`, [], {
           stdio: 'inherit',
           shell: true,
           env: { ...childEnv, NODE_NO_WARNINGS: '1' },
         })
-      : spawn(cacheCommand, cacheArgs, { stdio: 'inherit', env: childEnv });
+      : deps.spawn(cacheCommand, cacheArgs, { stdio: 'inherit', env: childEnv });
 
     cacheChild.on('exit', (code) => {
       if (code !== 0) {
diff --git a/tests/unit/commands/update-command-current-install.test.ts b/tests/unit/commands/update-command-current-install.test.ts
index 33e7cf51..a0f44ad8 100644
--- a/tests/unit/commands/update-command-current-install.test.ts
+++ b/tests/unit/commands/update-command-current-install.test.ts
@@ -1,31 +1,31 @@
-import { afterEach, beforeEach, describe, expect, it, mock } from 'bun:test';
+import { afterEach, beforeEach, describe, expect, it } from 'bun:test';
+import { handleUpdateCommand, type UpdateCommandDeps } from '../../../src/commands/update-command';
 
 let logLines: string[] = [];
 let spawnCalls: Array<{ command: string; args: string[]; env?: NodeJS.ProcessEnv }> = [];
-let exitCodes: number[] = [];
-let stateReads = 0;
 let originalConsoleLog: typeof console.log;
 let originalProcessExit: typeof process.exit;
-let updateCheckResult:
+
+type InstalledState = {
+  version: string | null;
+  packageJsonMtimeMs: number | null;
+  scriptMtimeMs: number | null;
+};
+
+type Scenario = {
+  beforeState: InstalledState;
+  afterState: InstalledState;
+};
+
+type UpdateCheckResult =
   | { status: 'update_available'; current: string; latest: string }
   | { status: 'no_update' }
   | { status: 'check_failed'; message: string };
-let currentInstallOverride = installDescriptor();
-
-type Scenario = {
-  beforeState: {
-    version: string | null;
-    packageJsonMtimeMs: number | null;
-    scriptMtimeMs: number | null;
-  };
-  afterState: {
-    version: string | null;
-    packageJsonMtimeMs: number | null;
-    scriptMtimeMs: number | null;
-  };
-};
 
 let scenario: Scenario;
+let updateCheckResult: UpdateCheckResult;
+let currentInstallOverride: ReturnType<typeof installDescriptor>;
+let stateReads = 0;
 
 function installDescriptor() {
   return {
@@ -38,67 +38,10 @@ function installDescriptor() {
   };
 }
 
-beforeEach(() => {
-  logLines = [];
-  spawnCalls = [];
-  exitCodes = [];
-  stateReads = 0;
-  scenario = {
-    beforeState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
-    afterState: { version: '7.67.0-dev.9', packageJsonMtimeMs: 200, scriptMtimeMs: 200 },
-  };
-  updateCheckResult = {
-    status: 'update_available',
-    current: '7.67.0-dev.5',
-    latest: '7.67.0-dev.9',
-  };
-  currentInstallOverride = installDescriptor();
-
-  originalConsoleLog = console.log;
-  originalProcessExit = process.exit;
-
-  console.log = (...args: unknown[]) => {
-    logLines.push(args.map(String).join(' '));
-  };
-
-  process.exit = ((code?: number) => {
-    exitCodes.push(code ?? 0);
-    throw new Error(`process.exit(${code ?? 0})`);
-  }) as typeof process.exit;
-
-  mock.module('child_process', () => ({
-    spawn: (command: string, args: string[], options?: { env?: NodeJS.ProcessEnv }) => {
-      spawnCalls.push({ command, args, env: options?.env });
-      return {
-        on: (event: string, callback: (code?: number) => void) => {
-          if (event === 'exit') {
-            callback(0);
-          }
-        },
-      };
-    },
-  }));
-
-  mock.module('../../../src/utils/ui', () => ({
+function createDeps(): UpdateCommandDeps {
+  return {
     initUI: async () => {},
-    header: (value: string) => value,
-    ok: (value: string) => `[OK] ${value}`,
-    fail: (value: string) => `[X] ${value}`,
-    warn: (value: string) => `[!] ${value}`,
-    info: (value: string) => `[i] ${value}`,
-    color: (value: string) => value,
-  }));
-
-  mock.module('../../../src/utils/version', () => ({
     getVersion: () => '7.67.0-dev.5',
-  }));
-
-  mock.module('../../../src/utils/update-checker', () => ({
-    compareVersionsWithPrerelease: (left: string, right: string) => left.localeCompare(right),
-    checkForUpdates: async () => updateCheckResult,
-  }));
-
-  mock.module('../../../src/utils/package-manager-detector', () => ({
     detectCurrentInstall: () => currentInstallOverride,
     buildPackageManagerEnv: () => {
       if (currentInstallOverride.manager === 'npm') {
@@ -138,27 +81,59 @@ beforeEach(() => {
       stateReads += 1;
       return stateReads === 1 ? scenario.beforeState : scenario.afterState;
     },
-  }));
+    compareVersionsWithPrerelease: (left: string, right: string) => left.localeCompare(right),
+    checkForUpdates: async () => updateCheckResult,
+    spawn: ((command: string, args: string[], options?: { env?: NodeJS.ProcessEnv }) => {
+      spawnCalls.push({ command, args, env: options?.env });
+      return {
+        stderr: undefined,
+        on: (event: string, callback: (code?: number) => void) => {
+          if (event === 'exit') {
+            callback(0);
+          }
+        },
+      };
+    }) as typeof UpdateCommandDeps.prototype.spawn,
+  };
+}
+
+beforeEach(() => {
+  logLines = [];
+  spawnCalls = [];
+  stateReads = 0;
+  scenario = {
+    beforeState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
+    afterState: { version: '7.67.0-dev.9', packageJsonMtimeMs: 200, scriptMtimeMs: 200 },
+  };
+  updateCheckResult = {
+    status: 'update_available',
+    current: '7.67.0-dev.5',
+    latest: '7.67.0-dev.9',
+  };
+  currentInstallOverride = installDescriptor();
+
+  originalConsoleLog = console.log;
+  originalProcessExit = process.exit;
+
+  console.log = (...args: unknown[]) => {
+    logLines.push(args.map(String).join(' '));
+  };
+
+  process.exit = ((code?: number) => {
+    throw new Error(`process.exit(${code ?? 0})`);
+  }) as typeof process.exit;
 });
 
 afterEach(() => {
   console.log = originalConsoleLog;
   process.exit = originalProcessExit;
-  mock.restore();
 });
 
-async function loadHandleUpdateCommand() {
-  const mod = await import(
-    `../../../src/commands/update-command?test=${Date.now()}-${Math.random()}`
-  );
-  return mod.handleUpdateCommand;
-}
-
 describe('update-command current install handling', () => {
   it('updates through the current install manager and prefix', async () => {
-    const handleUpdateCommand = await loadHandleUpdateCommand();
-
-    await expect(handleUpdateCommand({ beta: true })).rejects.toThrow('process.exit(0)');
+    await expect(handleUpdateCommand({ beta: true }, createDeps())).rejects.toThrow(
+      'process.exit(0)'
+    );
 
     const installCall = spawnCalls.find((call) => call.args.includes('install'));
 
@@ -172,9 +147,10 @@ describe('update-command current install handling', () => {
       beforeState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
       afterState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
     };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ beta: true })).rejects.toThrow('process.exit(1)');
+    await expect(handleUpdateCommand({ beta: true }, createDeps())).rejects.toThrow(
+      'process.exit(1)'
+    );
 
     expect(logLines.join('\n')).toContain('outside the current installation');
     expect(logLines.join('\n')).toContain(
@@ -187,9 +163,8 @@ describe('update-command current install handling', () => {
       beforeState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
       afterState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
     };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ force: true, beta: true })).rejects.toThrow(
+    await expect(handleUpdateCommand({ force: true, beta: true }, createDeps())).rejects.toThrow(
       'process.exit(1)'
     );
 
@@ -202,9 +177,8 @@ describe('update-command current install handling', () => {
       afterState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
     };
     updateCheckResult = { status: 'no_update' };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ force: true, beta: true })).rejects.toThrow(
+    await expect(handleUpdateCommand({ force: true, beta: true }, createDeps())).rejects.toThrow(
       'process.exit(1)'
     );
 
@@ -217,9 +191,8 @@ describe('update-command current install handling', () => {
       afterState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
     };
     updateCheckResult = { status: 'check_failed', message: 'network' };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ force: true, beta: true })).rejects.toThrow(
+    await expect(handleUpdateCommand({ force: true, beta: true }, createDeps())).rejects.toThrow(
       'process.exit(1)'
     );
 
@@ -231,9 +204,10 @@ describe('update-command current install handling', () => {
       beforeState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 100, scriptMtimeMs: 100 },
       afterState: { version: '7.67.1-dev.0', packageJsonMtimeMs: 200, scriptMtimeMs: 200 },
     };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ beta: true })).rejects.toThrow('process.exit(0)');
+    await expect(handleUpdateCommand({ beta: true }, createDeps())).rejects.toThrow(
+      'process.exit(0)'
+    );
 
     expect(logLines.join('\n')).not.toContain('outside the current installation');
   });
@@ -244,9 +218,8 @@ describe('update-command current install handling', () => {
       afterState: { version: '7.67.0-dev.5', packageJsonMtimeMs: 200, scriptMtimeMs: 200 },
     };
     updateCheckResult = { status: 'no_update' };
-    const handleUpdateCommand = await loadHandleUpdateCommand();
 
-    await expect(handleUpdateCommand({ force: true, beta: true })).rejects.toThrow(
+    await expect(handleUpdateCommand({ force: true, beta: true }, createDeps())).rejects.toThrow(
       'process.exit(0)'
     );
 
@@ -268,14 +241,15 @@ describe('update-command current install handling', () => {
         prefix: envValue,
       };
 
-      const handleUpdateCommand = await loadHandleUpdateCommand();
-
-      await expect(handleUpdateCommand({ beta: true })).rejects.toThrow('process.exit(0)');
+      await expect(handleUpdateCommand({ beta: true }, createDeps())).rejects.toThrow(
+        'process.exit(0)'
+      );
 
       const updateCall = spawnCalls.find(
         (call) =>
           call.command === manager && call.args.some((arg) => arg.includes('@kaitranntt/ccs@dev'))
       );
+
       expect(updateCall?.args).toContain(expectedArg);
       expect(updateCall?.env?.[envKey]).toBe(envValue);
     }