diff --git a/jsurfer-fastjson/pom.xml b/jsurfer-fastjson/pom.xml
index f264d6b..ed3c2d9 100644
--- a/jsurfer-fastjson/pom.xml
+++ b/jsurfer-fastjson/pom.xml
@@ -61,7 +61,7 @@
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>1.2.76</version>
+            <version>${fastjson.version}</version>
         </dependency>
     </dependencies>
 
diff --git a/jsurfer-gson/pom.xml b/jsurfer-gson/pom.xml
index 1adacdc..cb9378b 100644
--- a/jsurfer-gson/pom.xml
+++ b/jsurfer-gson/pom.xml
@@ -56,7 +56,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.7</version>
+            <version>${gson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.github.jsurfer</groupId>
diff --git a/pom.xml b/pom.xml
index a9c5c09..2f128fa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,6 +15,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <sonar.host.url>http://localhost:32768</sonar.host.url>
         <jackson.version>2.12.4</jackson.version>
+        <gson.version>2.8.7</gson.version>
+        <fastjson.version>1.2.76</fastjson.version>
     </properties>
 
     <developers>