diff --git a/stream-applications-release-train/pom.xml b/stream-applications-release-train/pom.xml
index 5621d7f0..e6cb8fe9 100644
--- a/stream-applications-release-train/pom.xml
+++ b/stream-applications-release-train/pom.xml
@@ -9,7 +9,7 @@
     <parent>
         <groupId>org.springframework.cloud.stream.app</groupId>
         <artifactId>stream-applications-core</artifactId>
-        <version>3.1.0-SNAPSHOT</version>
+        <version>3.1.0-RC1</version>
         <relativePath>../applications/stream-applications-core/pom.xml</relativePath>
     </parent>
 
@@ -19,9 +19,9 @@
     </modules>
 
     <properties>
-        <revision>2021.0.0-SNAPSHOT</revision>
-        <apps.version>3.1.0-SNAPSHOT</apps.version>
-        <apps.harbor.version>3.0.2</apps.harbor.version>
+        <revision>2021.0.0-RC1</revision>
+        <apps.version>3.1.0-RC1</apps.version>
+        <apps.harbor.version>3.1.0-RC1</apps.harbor.version>
         <cdc-debezium-source.version>${apps.version}</cdc-debezium-source.version>
         <file-source.version>${apps.version}</file-source.version>
         <ftp-source.version>${apps.version}</ftp-source.version>
diff --git a/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/kafka-apps-harbor.properties b/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/kafka-apps-harbor.properties
index 237bcd7e..b8d02374 100644
--- a/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/kafka-apps-harbor.properties
+++ b/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/kafka-apps-harbor.properties
@@ -19,6 +19,7 @@ source.twitter-message=docker:projects.registry.vmware.com/springcloudstream/twi
 source.twitter-search=docker:projects.registry.vmware.com/springcloudstream/twitter-search-source-kafka:@apps.harbor.version@
 source.twitter-stream=docker:projects.registry.vmware.com/springcloudstream/twitter-stream-source-kafka:@apps.harbor.version@
 source.websocket=docker:projects.registry.vmware.com/springcloudstream/websocket-source-kafka:@apps.harbor.version@
+source.zeromq=docker:projects.registry.vmware.com/springcloudstream/zeromq-source-kafka:@apps.harbor.version@
 sink.cassandra=docker:projects.registry.vmware.com/springcloudstream/cassandra-sink-kafka:@apps.harbor.version@
 sink.analytics=docker:projects.registry.vmware.com/springcloudstream/analytics-sink-kafka:@apps.harbor.version@
 sink.elasticsearch=docker:projects.registry.vmware.com/springcloudstream/elasticsearch-sink-kafka:@apps.harbor.version@
@@ -42,6 +43,7 @@ sink.throughput=docker:projects.registry.vmware.com/springcloudstream/throughput
 sink.twitter-message=docker:projects.registry.vmware.com/springcloudstream/twitter-message-sink-kafka:@apps.harbor.version@
 sink.twitter-update=docker:projects.registry.vmware.com/springcloudstream/twitter-update-sink-kafka:@apps.harbor.version@
 sink.websocket=docker:projects.registry.vmware.com/springcloudstream/websocket-sink-kafka:@apps.harbor.version@
+sink.zeromq=docker:projects.registry.vmware.com/springcloudstream/zeromq-sink-kafka:@apps.harbor.version@
 processor.aggregator=docker:projects.registry.vmware.com/springcloudstream/aggregator-processor-kafka:@apps.harbor.version@
 processor.bridge=docker:projects.registry.vmware.com/springcloudstream/bridge-processor-kafka:@apps.harbor.version@
 processor.filter=docker:projects.registry.vmware.com/springcloudstream/filter-processor-kafka:@apps.harbor.version@
diff --git a/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/rabbit-apps-harbor.properties b/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/rabbit-apps-harbor.properties
index fe2ace86..aeb49916 100644
--- a/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/rabbit-apps-harbor.properties
+++ b/stream-applications-release-train/stream-applications-descriptor/src/main/resources/META-INF/rabbit-apps-harbor.properties
@@ -19,6 +19,7 @@ source.twitter-message=docker:projects.registry.vmware.com/springcloudstream/twi
 source.twitter-search=docker:projects.registry.vmware.com/springcloudstream/twitter-search-source-rabbit:@apps.harbor.version@
 source.twitter-stream=docker:projects.registry.vmware.com/springcloudstream/twitter-stream-source-rabbit:@apps.harbor.version@
 source.websocket=docker:projects.registry.vmware.com/springcloudstream/websocket-source-rabbit:@apps.harbor.version@
+source.zeromq=docker:projects.registry.vmware.com/springcloudstream/zeromq-source-rabbit:@apps.harbor.version@
 sink.cassandra=docker:projects.registry.vmware.com/springcloudstream/cassandra-sink-rabbit:@apps.harbor.version@
 sink.analytics=docker:projects.registry.vmware.com/springcloudstream/analytics-sink-rabbit:@apps.harbor.version@
 sink.elasticsearch=docker:projects.registry.vmware.com/springcloudstream/elasticsearch-sink-rabbit:@apps.harbor.version@
@@ -42,6 +43,7 @@ sink.throughput=docker:projects.registry.vmware.com/springcloudstream/throughput
 sink.twitter-message=docker:projects.registry.vmware.com/springcloudstream/twitter-message-sink-rabbit:@apps.harbor.version@
 sink.twitter-update=docker:projects.registry.vmware.com/springcloudstream/twitter-update-sink-rabbit:@apps.harbor.version@
 sink.websocket=docker:projects.registry.vmware.com/springcloudstream/websocket-sink-rabbit:@apps.harbor.version@
+sink.zeromq=docker:projects.registry.vmware.com/springcloudstream/zeromq-sink-rabbit:@apps.harbor.version@
 processor.aggregator=docker:projects.registry.vmware.com/springcloudstream/aggregator-processor-rabbit:@apps.harbor.version@
 processor.bridge=docker:projects.registry.vmware.com/springcloudstream/bridge-processor-rabbit:@apps.harbor.version@
 processor.filter=docker:projects.registry.vmware.com/springcloudstream/filter-processor-rabbit:@apps.harbor.version@