diff --git a/mongodb/transactions/pom.xml b/mongodb/transactions/pom.xml
index e561e682..05d5e96e 100644
--- a/mongodb/transactions/pom.xml
+++ b/mongodb/transactions/pom.xml
@@ -15,6 +15,7 @@
 		<mongodb.version>3.8.0</mongodb.version>
 		<mongo-driver-reactivestreams.version>1.9.0</mongo-driver-reactivestreams.version>
 		<spring-data-releasetrain.version>Lovelace-RC1</spring-data-releasetrain.version>
+		<reactor-bom.version>Californium-M1</reactor-bom.version>
 	</properties>
 
 	<profiles>