diff --git a/backend/pom.xml b/backend/pom.xml
index 76bf745..76f041d 100644
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -13,6 +13,7 @@
     <parent>
         <groupId>uk.co.neviyn</groupId>
         <artifactId>Observations</artifactId>
+        <!--suppress MavenPropertyInParent -->
         <version>${revision}</version>
     </parent>
 
@@ -62,10 +63,12 @@
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-stdlib-jdk8</artifactId>
+            <version>${kotlin.version}</version>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-reflect</artifactId>
+            <version>${kotlin.version}</version>
         </dependency>
 
         <dependency>
diff --git a/frontend/pom.xml b/frontend/pom.xml
index c56981d..d6117b2 100644
--- a/frontend/pom.xml
+++ b/frontend/pom.xml
@@ -5,6 +5,7 @@
     <parent>
         <groupId>uk.co.neviyn</groupId>
         <artifactId>Observations</artifactId>
+        <!--suppress MavenPropertyInParent -->
         <version>${revision}</version>
     </parent>