migrated the following modules using parent-spring-5 to spring 5.1:

spring-mvc-simple
spring-security-mvc-custom
spring-security-mvc-login
spring-security-rest
spring-security-rest-basic-auth
spring-static-resources
spring-thymeleaf

ethereum/pom.xml

@@ -7,10 +7,10 @@
     <name>ethereum</name>
 
     <parent>
-        <artifactId>parent-spring-5</artifactId>
+        <artifactId>parent-spring-5-1</artifactId>
         <groupId>com.baeldung</groupId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-spring-5</relativePath>
+        <relativePath>../parent-spring-5-1</relativePath>
     </parent>
 
     <dependencies>