diff --git a/gradle/dependency-management.gradle b/gradle/dependency-management.gradle
index 3a3aac106c..69167d5b52 100644
--- a/gradle/dependency-management.gradle
+++ b/gradle/dependency-management.gradle
@@ -98,10 +98,10 @@ dependencyManagement {
 		dependency 'nz.net.ultraq.thymeleaf:thymeleaf-expression-processor:1.1.3'
 		dependency 'nz.net.ultraq.thymeleaf:thymeleaf-layout-dialect:2.4.1'
 		dependency 'ognl:ognl:3.1.12'
-		dependency 'org.akhikhl.gretty:gretty-runner-tomcat8:2.0.0'
-		dependency 'org.akhikhl.gretty:gretty-runner-tomcat:2.0.0'
-		dependency 'org.akhikhl.gretty:gretty-runner:2.0.0'
-		dependency 'org.akhikhl.gretty:gretty-runner:2.0.0'
+		dependency 'org.akhikhl.gretty:gretty-runner-tomcat9:2.3.0'
+		dependency 'org.akhikhl.gretty:gretty-runner-tomcat:2.3.0'
+		dependency 'org.akhikhl.gretty:gretty-runner:2.3.0'
+		dependency 'org.akhikhl.gretty:gretty-runner:2.3.0'
 		dependency 'org.apache.commons:commons-collections4:4.1'
 		dependency 'org.apache.commons:commons-exec:1.3'
 		dependency 'org.apache.commons:commons-lang3:3.7'
@@ -139,12 +139,12 @@ dependencyManagement {
 		dependency 'org.apache.taglibs:taglibs-standard-impl:1.2.5'
 		dependency 'org.apache.taglibs:taglibs-standard-jstlel:1.2.5'
 		dependency 'org.apache.taglibs:taglibs-standard-spec:1.2.5'
-		dependency 'org.apache.tomcat.embed:tomcat-embed-core:8.5.23'
-		dependency 'org.apache.tomcat.embed:tomcat-embed-el:8.5.23'
-		dependency 'org.apache.tomcat.embed:tomcat-embed-jasper:8.5.23'
-		dependency 'org.apache.tomcat.embed:tomcat-embed-logging-log4j:8.0.44'
+		dependency 'org.apache.tomcat.embed:tomcat-embed-core:9.0.24'
+		dependency 'org.apache.tomcat.embed:tomcat-embed-el:9.0.24'
+		dependency 'org.apache.tomcat.embed:tomcat-embed-jasper:9.0.24'
+		dependency 'org.apache.tomcat.embed:tomcat-embed-logging-log4j:9.0.24'
 		dependency 'org.apache.tomcat.embed:tomcat-embed-websocket:8.5.23'
-		dependency 'org.apache.tomcat:tomcat-annotations-api:8.5.23'
+		dependency 'org.apache.tomcat:tomcat-annotations-api:9.0.24'
 		dependency "org.aspectj:aspectjrt:$aspectjVersion"
 		dependency "org.aspectj:aspectjtools:$aspectjVersion"
 		dependency "org.aspectj:aspectjweaver:$aspectjVersion"