diff --git a/packages/core/src/utils/proxyUtils.test.ts b/packages/core/src/utils/proxyUtils.test.ts
index 750e45a69..7f7a54373 100644
--- a/packages/core/src/utils/proxyUtils.test.ts
+++ b/packages/core/src/utils/proxyUtils.test.ts
@@ -77,4 +77,28 @@ describe('normalizeProxyUrl', () => {
   it('should handle IPv6 addresses with http:// prefix', () => {
     expect(normalizeProxyUrl('http://[::1]:8080')).toBe('http://[::1]:8080');
   });
+
+  it('should not modify URL that already has socks:// prefix', () => {
+    expect(normalizeProxyUrl('socks://proxy.example.com:1080')).toBe(
+      'socks://proxy.example.com:1080',
+    );
+  });
+
+  it('should not modify URL that already has socks4:// prefix', () => {
+    expect(normalizeProxyUrl('socks4://proxy.example.com:1080')).toBe(
+      'socks4://proxy.example.com:1080',
+    );
+  });
+
+  it('should not modify URL that already has socks5:// prefix', () => {
+    expect(normalizeProxyUrl('socks5://proxy.example.com:1080')).toBe(
+      'socks5://proxy.example.com:1080',
+    );
+  });
+
+  it('should handle SOCKS:// prefix (case insensitive)', () => {
+    expect(normalizeProxyUrl('SOCKS5://proxy.example.com:1080')).toBe(
+      'SOCKS5://proxy.example.com:1080',
+    );
+  });
 });
diff --git a/packages/core/src/utils/proxyUtils.ts b/packages/core/src/utils/proxyUtils.ts
index eb776ec71..30e42654d 100644
--- a/packages/core/src/utils/proxyUtils.ts
+++ b/packages/core/src/utils/proxyUtils.ts
@@ -27,7 +27,8 @@ export function normalizeProxyUrl(
   }
 
   // Check if the URL already has a protocol prefix
-  if (/^https?:\/\//i.test(trimmed)) {
+  // Support http, https, socks, socks4, socks5 protocols
+  if (/^(https?|socks[45]?):\/\//i.test(trimmed)) {
     return trimmed;
   }