diff --git a/pom.xml b/pom.xml
index 7d31938..7c0da55 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,25 +19,25 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>${netty-all.version}</version>
+            <version>4.1.42.Final</version>
         </dependency>
 
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>${lombok.version}</version>
+            <version>1.16.12</version>
         </dependency>
 
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>${fastjson.version}</version>
+            <version>1.2.83_noneautotype</version>
         </dependency>
 
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
+            <version>4.13.1</version>
         </dependency>
 
     </dependencies>