diff --git a/7-dubbo-spi-loadbalance-samples/samples-spi-loadbalance/samples-spi-loadbalance-peakewma/pom.xml b/7-dubbo-spi-loadbalance-samples/samples-spi-loadbalance/samples-spi-loadbalance-peakewma/pom.xml
index 5f39a1c..a68daa0 100644
--- a/7-dubbo-spi-loadbalance-samples/samples-spi-loadbalance/samples-spi-loadbalance-peakewma/pom.xml
+++ b/7-dubbo-spi-loadbalance-samples/samples-spi-loadbalance/samples-spi-loadbalance-peakewma/pom.xml
@@ -30,8 +30,8 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-                <maven.compiler.source>1.8</maven.compiler.source>
-                <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
 
         <zookeeper.version>3.8.4</zookeeper.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -97,6 +97,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context-support</artifactId>
+            <version>${spring.version}</version>
         </dependency>