diff --git a/Part-6 Spring Boot Security/12.SpringSecuritySimpleExample/pom.xml b/Part-6 Spring Boot Security/12.SpringSecuritySimpleExample/pom.xml
index 62f9855d..6faff6b3 100644
--- a/Part-6 Spring Boot Security/12.SpringSecuritySimpleExample/pom.xml	
+++ b/Part-6 Spring Boot Security/12.SpringSecuritySimpleExample/pom.xml	
@@ -66,7 +66,7 @@
         <dependency>
             <groupId>org.webjars</groupId>
             <artifactId>bootstrap</artifactId>
-            <version>3.3.7</version>
+            <version>4.0.0</version>
         </dependency>
     </dependencies>