springboot view the embedded tomcat version and re-specify the version

From the following URL:

https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-tomcat/1.5.17.RELEASE

You can see that the corresponding embedded version is 8.5.34.

Join me now to upgrade to 8.5.51:

1.pom.xml configuration properties

 <properties>
     <tomcat.version>8.5.51</tomcat.version>
 </properties>

2. Add dependency

        <!--Specify the embedded tomcat version-->
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-juli</artifactId>
            <version>${tomcat.version}</version>
        </dependency>

You can see from the startup log that tomcat has been replaced with a new version:

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