diff --git a/spring-petclinic-api-gateway/pom.xml b/spring-petclinic-api-gateway/pom.xml
index f86fa138a..f870bd915 100644
--- a/spring-petclinic-api-gateway/pom.xml
+++ b/spring-petclinic-api-gateway/pom.xml
@@ -15,7 +15,8 @@
     </parent>
 
     <properties>
-        <webjars-bootstrap.version>3.3.7-1</webjars-bootstrap.version>
+        <!-- Any bootstrap version upgrade must be reported in the wro4j.xml file -->
+        <webjars-bootstrap.version>3.4.0</webjars-bootstrap.version>
         <webjars-jquery.version>3.6.0</webjars-jquery.version>
         <webjars-angular.version>1.8.2</webjars-angular.version>
         <webjars-angular-ui-router.version>1.0.20</webjars-angular-ui-router.version>
diff --git a/spring-petclinic-api-gateway/src/main/wro/wro.xml b/spring-petclinic-api-gateway/src/main/wro/wro.xml
index 86574683c..80608cd5f 100644
--- a/spring-petclinic-api-gateway/src/main/wro/wro.xml
+++ b/spring-petclinic-api-gateway/src/main/wro/wro.xml
@@ -1,6 +1,6 @@
 <groups xmlns="http://www.isdc.ro/wro">
   <group name="petclinic">
-    <css>classpath:META-INF/resources/webjars/bootstrap/3.3.7-1/less/bootstrap.less</css>
+    <css>classpath:META-INF/resources/webjars/bootstrap/3.4.0/less/bootstrap.less</css>
     <css>/petclinic.less</css>
    </group>
 </groups>