diff --git a/docker/docker-compose.1604.51.yaml b/docker/docker-compose.1604.51.yaml
index a630577951..27a69e3a8d 100644
--- a/docker/docker-compose.1604.51.yaml
+++ b/docker/docker-compose.1604.51.yaml
@@ -8,7 +8,7 @@ services:
       args:
         ubuntu_version: "16.04"
         swift_version: "5.1"
-        swift_flavour: "DEVELOPMENT-SNAPSHOT-2019-07-09-a"
+        swift_flavour: "DEVELOPMENT-SNAPSHOT-2019-07-19-a"
         swift_builds_suffix: "branch"
 
   unit-tests: