diff --git a/stack/pom.xml b/stack/pom.xml
index 22651cb774..156f6ee278 100644
--- a/stack/pom.xml
+++ b/stack/pom.xml
@@ -117,7 +117,7 @@
         <shiro-version>1.3.2</shiro-version>
         <slf4j-version>1.7.2</slf4j-version>
         <snakeyaml-version>1.9</snakeyaml-version>
-        <tomcat-version>7.0.84</tomcat-version>
+        <tomcat-version>9.0.99</tomcat-version>
         <antlr.version>3.4</antlr.version>
         <tika.version>1.4</tika.version>
         <mockito.version>1.10.8</mockito.version>