diff --git a/pom.xml b/pom.xml
index 10a2c2b..e1d2680 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,6 +30,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
                 <configuration>
                     <source>8</source>
                     <target>8</target>
@@ -38,6 +39,7 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>2.2.6.RELEASE</version>
                 <configuration>
                     <mainClass>net.lamgc.cgj.Main</mainClass>
                     <classifier>exec</classifier>
@@ -50,20 +52,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.jetbrains.kotlin</groupId>
-                <artifactId>kotlin-maven-plugin</artifactId>
-                <version>${kotlin.version}</version>
-                <executions>
-                    <execution>
-                        <id>compile</id>
-                        <phase>process-sources</phase>
-                        <goals>
-                            <goal>compile</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
         </plugins>
     </build>