diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index 651c896..7bb42be 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -19,6 +19,11 @@ jobs:
         run: |
           cat /proc/version 
 
+      - name: Install gnupg
+        run: |
+          sudo apt update
+          sudo apt install -y gnupg
+
       - name: Change Download URL to NJU Mirror
         run: |
           # 替换为 NJU 的 APT 源
@@ -26,7 +31,8 @@ jobs:
           echo "deb https://mirror.nju.edu.cn/ubuntu/ focal-updates main restricted universe multiverse" >> /etc/apt/sources.list
           echo "deb https://mirror.nju.edu.cn/ubuntu/ focal-backports main restricted universe multiverse" >> /etc/apt/sources.list
           echo "deb https://mirror.nju.edu.cn/ubuntu/ focal-security main restricted universe multiverse" >> /etc/apt/sources.list
-          
+      - name: Add missing GPG keys for NJU mirror
+        run: | 
           # 导入公钥 3B4FE6ACC0B21F32
           apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32