Update migration for Spring Boot 4

java/migration.md

@@ -53,16 +53,18 @@ Here, the *migration* `com.sap.cds.services.migrations.MigrateStatements` from C
 
 ### Spring Boot 4
 
-CAP Java 5 uses Spring Boot 4 as underlying framework. Consult the [Spring Boot 4.0 Migration Guide](https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide) for changes between Spring Boot 3.5 and Spring Boot 4.0.
+CAP Java 5 uses Spring Boot 4 and Spring Security 7 as underlying framework. A CAP Java application is typically only affected by Spring Boot 4 incompatibilities if it uses native Spring APIs. Consult the [Spring Boot 4.0 Migration Guide](https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide) for changes between Spring Boot 3.5 and Spring Boot 4.0. For changes between Spring Security 6.5 and 7 refer to the [Spring Security 7 Migration Guide](https://docs.spring.io/spring-security/reference/migration/).
+
+In any case, it is required to upgrade the [BTP Security Library](https://github.com/SAP/cloud-security-services-integration-library) to version > 4.0.0.
 
 ### Minimum Versions
 
-CAP Java 4.0 increased some minimum required versions:
+CAP Java 5.0 increased some minimum required versions:
 
 | Dependency | Minimum Version |
 | --- | --- |
 | Spring Boot | 4.0 |
-| XSUAA | TBD |
+| XSUAA (BTP Security Library) | 4.0.0 |
 
 ## CAP Java 3.10 to CAP Java 4.0 { #three-to-four }