diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index b72ddce..c1393e2 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -4,10 +4,13 @@ on:
   schedule:
     - cron: '0 0 * * *'
   workflow_dispatch:
+    branches:
+      - master
 
 jobs:
   update:
     runs-on: ubuntu-slim
+    if: github.ref == 'refs/heads/master'
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
diff --git a/scripts/gfwlist_parser.py b/scripts/gfwlist_parser.py
index 5133269..44219a9 100644
--- a/scripts/gfwlist_parser.py
+++ b/scripts/gfwlist_parser.py
@@ -43,9 +43,15 @@ def is_cidr(s):
                     return True
         return False
     if ':' in ip_part:
-        if all(c in set('0123456789abcdefABCDEF:') for c in ip_part):
+        ipv6_pattern = r'^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$|^(::)$|^::1$'
+        if re.match(ipv6_pattern, ip_part):
             if 0 <= suffix_val <= 128:
                 return True
+        if ip_part.startswith('::ffff:'):
+            ipv4_in_v6_pattern = r'^::ffff:(\d{1,3}\.){3}\d{1,3}$'
+            if re.match(ipv4_in_v6_pattern, ip_part):
+                if 0 <= suffix_val <= 128:
+                    return True
         return False
     return False