diff --git a/grails-test-examples/spring-security/cas/test1/build.gradle b/grails-test-examples/spring-security/cas/test1/build.gradle
index 7269dc728cf..5ddf8099c6d 100644
--- a/grails-test-examples/spring-security/cas/test1/build.gradle
+++ b/grails-test-examples/spring-security/cas/test1/build.gradle
@@ -38,7 +38,7 @@ dependencies {
     implementation 'org.apache.grails:grails-layout'
 
     // 3rd party client-side assets bundled in webjars
-    implementation 'org.webjars:bootstrap:3.3.6'
+    implementation 'org.webjars:bootstrap:5.3.8'
     implementation 'org.webjars:jquery:2.2.0'
 
     runtimeOnly 'cloud.wondrify:asset-pipeline-grails'
diff --git a/grails-test-examples/spring-security/ldap/custom-user-details-context-mapper/build.gradle b/grails-test-examples/spring-security/ldap/custom-user-details-context-mapper/build.gradle
index 2faa88f11db..f474c632c4b 100644
--- a/grails-test-examples/spring-security/ldap/custom-user-details-context-mapper/build.gradle
+++ b/grails-test-examples/spring-security/ldap/custom-user-details-context-mapper/build.gradle
@@ -38,7 +38,7 @@ dependencies {
     implementation 'org.apache.grails:grails-layout'
 
     // 3rd party client-side assets bundled in webjars
-    implementation 'org.webjars:bootstrap:4.1.3'
+    implementation 'org.webjars:bootstrap:5.3.8'
     implementation 'org.webjars:jquery:3.3.1'
 
     // to not depend on an external ldap server
diff --git a/grails-test-examples/spring-security/ldap/functional-test-app/build.gradle b/grails-test-examples/spring-security/ldap/functional-test-app/build.gradle
index cd84de60707..9cab2acea56 100644
--- a/grails-test-examples/spring-security/ldap/functional-test-app/build.gradle
+++ b/grails-test-examples/spring-security/ldap/functional-test-app/build.gradle
@@ -40,7 +40,7 @@ dependencies {
     implementation 'org.apache.grails:grails-layout'
 
     // 3rd party client-side assets bundled in webjars
-    implementation 'org.webjars:bootstrap:4.1.3'
+    implementation 'org.webjars:bootstrap:5.3.8'
     implementation 'org.webjars:jquery:3.3.1'
 
     runtimeOnly 'cloud.wondrify:asset-pipeline-grails'
diff --git a/grails-test-examples/spring-security/ldap/retrieve-db-roles/build.gradle b/grails-test-examples/spring-security/ldap/retrieve-db-roles/build.gradle
index 9021327e0ca..c92427d15a2 100644
--- a/grails-test-examples/spring-security/ldap/retrieve-db-roles/build.gradle
+++ b/grails-test-examples/spring-security/ldap/retrieve-db-roles/build.gradle
@@ -38,7 +38,7 @@ dependencies {
     implementation 'org.apache.grails:grails-layout'
 
     // 3rd party client-side assets bundled in webjars
-    implementation 'org.webjars:bootstrap:4.1.3'
+    implementation 'org.webjars:bootstrap:5.3.8'
     implementation 'org.webjars:jquery:3.3.1'
 
     // in-memory ldap server for testing
diff --git a/grails-test-examples/spring-security/ldap/retrieve-group-roles/build.gradle b/grails-test-examples/spring-security/ldap/retrieve-group-roles/build.gradle
index de683ed0e17..eed1c586b2f 100644
--- a/grails-test-examples/spring-security/ldap/retrieve-group-roles/build.gradle
+++ b/grails-test-examples/spring-security/ldap/retrieve-group-roles/build.gradle
@@ -38,7 +38,7 @@ dependencies {
     implementation 'org.apache.grails:grails-layout'
 
     // 3rd party client-side assets bundled in webjars
-    implementation 'org.webjars:bootstrap:4.1.3'
+    implementation 'org.webjars:bootstrap:5.3.8'
     implementation 'org.webjars:jquery:3.3.1'
 
     // to not depend on an external ldap server