diff --git a/yudao-dependencies/pom.xml b/yudao-dependencies/pom.xml
index 8eb89c6..5fb0626 100644
--- a/yudao-dependencies/pom.xml
+++ b/yudao-dependencies/pom.xml
@@ -78,6 +78,7 @@
         <jimureport.version>2.3.2</jimureport.version>
         <jimubi.version>2.3.2</jimubi.version>
         <weixin-java.version>4.8.2-20260501.180637</weixin-java.version>
+        <bouncycastle.version>1.80</bouncycastle.version>
         <alipay-sdk-java.version>4.40.771.ALL</alipay-sdk-java.version>
     </properties>
 
@@ -646,6 +647,24 @@
                 </exclusions>
             </dependency>
 
+            <!-- 锁定 weixin-java 传递依赖，避免 Maven 版本范围自动升级到 1.80.2 后 Fat Jar 启动失败。
+                 反馈：https://t.zsxq.com/pCVBo -->
+            <dependency>
+                <groupId>org.bouncycastle</groupId>
+                <artifactId>bcprov-jdk18on</artifactId>
+                <version>${bouncycastle.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.bouncycastle</groupId>
+                <artifactId>bcutil-jdk18on</artifactId>
+                <version>${bouncycastle.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.bouncycastle</groupId>
+                <artifactId>bcpkix-jdk18on</artifactId>
+                <version>${bouncycastle.version}</version>
+            </dependency>
+
             <dependency>
                 <groupId>com.github.binarywang</groupId>
                 <artifactId>weixin-java-pay</artifactId>