diff --git a/modules/openapi-generator/src/main/resources/java-undertow-server/pom.mustache b/modules/openapi-generator/src/main/resources/java-undertow-server/pom.mustache
index c0cfd07749b..77db3bd6efa 100644
--- a/modules/openapi-generator/src/main/resources/java-undertow-server/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/java-undertow-server/pom.mustache
@@ -29,7 +29,7 @@
         <version.logback>1.4.13</version.logback>
         <version.junit>4.13.2</version.junit>
         <version.mockito>2.1.0-beta.124</version.mockito>
-        <version.undertow>2.3.5.Final</version.undertow>
+        <version.undertow>2.3.12.Final</version.undertow>
         <version.jsonpath>2.2.0</version.jsonpath>
         <version.httpclient>4.5.13</version.httpclient>
         <version.httpasyncclient>4.1.2</version.httpasyncclient>
diff --git a/samples/server/petstore/java-undertow/pom.xml b/samples/server/petstore/java-undertow/pom.xml
index 04503f650a6..300e1ddd4e8 100644
--- a/samples/server/petstore/java-undertow/pom.xml
+++ b/samples/server/petstore/java-undertow/pom.xml
@@ -29,7 +29,7 @@
         <version.logback>1.4.13</version.logback>
         <version.junit>4.13.2</version.junit>
         <version.mockito>2.1.0-beta.124</version.mockito>
-        <version.undertow>2.3.5.Final</version.undertow>
+        <version.undertow>2.3.12.Final</version.undertow>
         <version.jsonpath>2.2.0</version.jsonpath>
         <version.httpclient>4.5.13</version.httpclient>
         <version.httpasyncclient>4.1.2</version.httpasyncclient>