diff --git a/.gitignore b/.gitignore
index 9a94f7cbc..c10bb2817 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 *~
 .DS_Store
 .idea
+.env
 
 # Old OS3 files and folders
 .coverage
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 4e5d25661..a61a7a922 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -56,6 +56,15 @@ required (phony) targets are:
 - `run-tests`: Execute all tests from the submodule
 - `build-dev`: Build an image with the tag `openslides-<service>-dev`
 
+### Build arguments in the Dockerfile
+
+These build arguments should be supported by every service:
+
+- `REPOSITORY_URL`: The git-url for the repository to use
+- `GIT_CHECKOUT`: A branch/tag/commit to check out during the build
+
+Note that meaningful defaults should be provided in the Dockerfile.
+
 ## Developing on a single service
 
 Go to the serivce and create a new branch (from master):
diff --git a/Makefile b/Makefile
index 290e1d0fc..1d8b8df5b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-# TESTS
+SHELL := /bin/bash
 
 run-system-tests:
 	echo "TODO: write complete system tests"
@@ -14,6 +14,7 @@ run-dev: | build-dev
 	docker-compose -f docker-compose.yml -f docker-compose.dev.yml -p 127.0.0.1:8000:8000/tcp up
 
 build-prod:
+	git submodule status | awk '{ gsub(/[^0-9a-f]/, "", $$1); gsub("-","_",$$2); print toupper($$2)"_COMMIT_HASH="$$1 }' > .env
 	docker-compose -f docker-compose.yml -f docker-compose.prod.yml build
 
 run-prod: | build-prod
diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index 7e09bb737..191c52ff4 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -1,10 +1,16 @@
 version: '3'
 services:
     datastore-writer:
-        build: https://github.com/OpenSlides/openslides-datastore-service.git#:writer
+        build:
+            context: "https://github.com/OpenSlides/openslides-datastore-service.git#:writer"
+            args:
+                GIT_CHECKOUT: "${OPENSLIDES_DATASTORE_SERVICE_COMMIT_HASH}"
         image: openslides-datastore-writer
     client:
-        build: https://github.com/OpenSlides/openslides-client.git
+        build:
+            context: "https://github.com/OpenSlides/openslides-client.git"
+            args:
+                GIT_CHECKOUT: "${OPENSLIDES_CLIENT_COMMIT_HASH}"
         image: openslides-client
     haproxy:
         build: ./haproxy
diff --git a/openslides-client b/openslides-client
index e75e72b50..049920af1 160000
--- a/openslides-client
+++ b/openslides-client
@@ -1 +1 @@
-Subproject commit e75e72b50c66cd59ca6aac8cea1cf8c6c998d954
+Subproject commit 049920af19dd88d83548e710d25f07dacd3b56f4
diff --git a/openslides-datastore-service b/openslides-datastore-service
index 51af334dd..4325e10af 160000
--- a/openslides-datastore-service
+++ b/openslides-datastore-service
@@ -1 +1 @@
-Subproject commit 51af334ddc7c7a57616263e8d56e27c21c0e5e65
+Subproject commit 4325e10af1f7ecad911c9f3ded195ba08f7eef86