diff --git a/codeagent-wrapper/main.go b/codeagent-wrapper/main.go
index c5d0772..a77eea0 100644
--- a/codeagent-wrapper/main.go
+++ b/codeagent-wrapper/main.go
@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	version               = "5.7.2"
+	version               = "5.8.0"
 	defaultWorkdir        = "."
 	defaultTimeout        = 7200 // seconds (2 hours)
 	defaultCoverageTarget = 90.0
diff --git a/codeagent-wrapper/main_test.go b/codeagent-wrapper/main_test.go
index 2f1da9e..5b98c88 100644
--- a/codeagent-wrapper/main_test.go
+++ b/codeagent-wrapper/main_test.go
@@ -3051,7 +3051,7 @@ func TestVersionFlag(t *testing.T) {
 		}
 	})
 
-	want := "codeagent-wrapper version 5.7.2\n"
+	want := "codeagent-wrapper version 5.8.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3067,7 +3067,7 @@ func TestVersionShortFlag(t *testing.T) {
 		}
 	})
 
-	want := "codeagent-wrapper version 5.7.2\n"
+	want := "codeagent-wrapper version 5.8.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3083,7 +3083,7 @@ func TestVersionLegacyAlias(t *testing.T) {
 		}
 	})
 
-	want := "codex-wrapper version 5.7.2\n"
+	want := "codex-wrapper version 5.8.0\n"
 
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
diff --git a/package.json b/package.json
index 6b8fe3c..e0442f6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ccg-workflow",
-  "version": "1.7.93",
+  "version": "1.7.94",
   "description": "Claude + Codex + Gemini multi-model collaboration system - smart routing development workflow",
   "type": "module",
   "packageManager": "pnpm@10.17.1",
diff --git a/src/utils/installer.ts b/src/utils/installer.ts
index 15c8652..e9f8b8d 100644
--- a/src/utils/installer.ts
+++ b/src/utils/installer.ts
@@ -41,6 +41,17 @@ export {
   writeFastContextPrompt,
 } from './installer-prompt'
 
+// ═══════════════════════════════════════════════════════
+// Binary version tracking
+// ═══════════════════════════════════════════════════════
+
+/**
+ * Expected codeagent-wrapper binary version.
+ * Must match the `version` constant in codeagent-wrapper/main.go.
+ * When this differs from the installed binary, update triggers re-download.
+ */
+const EXPECTED_BINARY_VERSION = '5.8.0'
+
 // ═══════════════════════════════════════════════════════
 // Install context — shared across sub-functions
 // ═══════════════════════════════════════════════════════
@@ -499,15 +510,22 @@ async function installBinaryFile(ctx: InstallContext): Promise<void> {
 
     const destBinary = join(binDir, process.platform === 'win32' ? 'codeagent-wrapper.exe' : 'codeagent-wrapper')
 
-    // Skip download if binary already exists and is functional
+    // Check if binary exists, is functional, AND version matches
     if (await fs.pathExists(destBinary)) {
       try {
         const { execSync } = await import('node:child_process')
-        execSync(`"${destBinary}" --version`, { stdio: 'pipe' })
-        // Binary exists and works — skip download
-        ctx.result.binPath = binDir
-        ctx.result.binInstalled = true
-        return
+        const versionOutput = execSync(`"${destBinary}" --version`, { stdio: 'pipe' }).toString().trim()
+        const installedVersion = versionOutput.replace(/^.*version\s*/, '')
+
+        // Compare with expected version from package
+        const expectedVersion = EXPECTED_BINARY_VERSION
+        if (installedVersion === expectedVersion) {
+          // Binary exists, works, and version matches — skip download
+          ctx.result.binPath = binDir
+          ctx.result.binInstalled = true
+          return
+        }
+        // Version mismatch — fall through to re-download
       }
       catch {
         // Binary exists but broken — fall through to re-download