diff --git a/_ext/gradle/p2-fat-jar-setup.gradle b/_ext/gradle/p2-fat-jar-setup.gradle
index fd61956882..dd404e1a31 100644
--- a/_ext/gradle/p2-fat-jar-setup.gradle
+++ b/_ext/gradle/p2-fat-jar-setup.gradle
@@ -7,7 +7,7 @@ buildscript {
         }
     }
     dependencies {
-        classpath "com.diffplug.gradle:goomph:3.15.0"
+        classpath "com.diffplug.gradle:goomph:3.17.4"
     }
 }
 apply plugin: com.diffplug.gradle.p2.AsMavenPlugin
@@ -73,7 +73,7 @@ p2AsMaven {
 		p2ant {
 			/*
 			Define p2ant proxy settings as a closure. Refer to the API documents for instructions:
-			https://diffplug.github.io/goomph/javadoc/3.3.0/com/diffplug/gradle/p2/AsMavenPlugin.html
+			https://diffplug.github.io/goomph/javadoc/3.17.4/com/diffplug/gradle/p2/AsMavenPlugin.html
 			*/
 			if (project.hasProperty('setP2AntProxy')) {
 				setP2AntProxy(it)
diff --git a/gradle.properties b/gradle.properties
index 41f440f62f..cb9d730db7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -25,7 +25,7 @@ VER_SPOTBUGS=3.1.6
 VER_SPOTBUGS_PLUGIN=1.6.2
 VER_BINTRAY=1.7.3
 VER_PLUGIN_PUBLISH=0.9.7
-VER_GOOMPH=3.8.1
+VER_GOOMPH=3.17.4
 VER_GRADLE_GIT=1.6.0
 VER_PEGDOWN_DOCLET=1.3