Allow customising the version of the Synapse image used in the Dockerfile

1 files changed, 4 insertions, 1 deletions

diff --git a/docker/Dockerfile-workers b/docker/Dockerfile-workers

index 46f2e17382..53f59e9362 100644
--- a/docker/Dockerfile-workers
+++ b/docker/Dockerfile-workers
@@ -1,5 +1,8 @@
+ARG base_version=latest
+
 # Inherit from the official Synapse docker image
-FROM matrixdotorg/synapse
+
+FROM matrixdotorg/synapse:$base_version
 
 # Install deps
 RUN apt-get update