diff --git a/pom.xml b/pom.xml
index 2b93da5..93ed935 100644
--- a/pom.xml
+++ b/pom.xml
@@ -150,7 +150,7 @@
       <dependency>
         <groupId>com.io7m.jregions</groupId>
         <artifactId>com.io7m.jregions.core</artifactId>
-        <version>4.0.0</version>
+        <version>5.0.0</version>
       </dependency>
       <dependency>
         <groupId>com.io7m.immutables.style</groupId>