diff --git a/Makefile b/Makefile
index 9e13c8f4..fa11162e 100644
--- a/Makefile
+++ b/Makefile
@@ -31,11 +31,13 @@ start-worker:
 upstream-sync:
 	. ./venv/bin/activate && python cre.py --upstream_sync
 
+PORT?=5000
+
 dev-flask:
-	. ./venv/bin/activate && INSECURE_REQUESTS=1 FLASK_APP=`pwd`/cre.py  FLASK_CONFIG=development flask run
+	. ./venv/bin/activate && INSECURE_REQUESTS=1 FLASK_APP=`pwd`/cre.py  FLASK_CONFIG=development flask run --port $(PORT)
 
 dev-flask-docker:
-	. ./venv/bin/activate && INSECURE_REQUESTS=1 FLASK_APP=`pwd`/cre.py  FLASK_CONFIG=development flask run --host=0.0.0.0
+	. ./venv/bin/activate && INSECURE_REQUESTS=1 FLASK_APP=`pwd`/cre.py  FLASK_CONFIG=development flask run --host=0.0.0.0 --port $(PORT)
 
 e2e:
 	yarn build
@@ -86,10 +88,10 @@ docker-prod:
 	docker build -f Dockerfile -t opencre:$(shell git rev-parse HEAD) .
 
 docker-dev-run:
-	docker run -it -p 127.0.0.1:5000:5000 opencre-dev:$(shell git rev-parse HEAD)
+	docker run -it -p 127.0.0.1:$(PORT):$(PORT) opencre-dev:$(shell git rev-parse HEAD)
 
 docker-prod-run:
-	 docker run -it -p 5000:5000 opencre:$(shell git rev-parse HEAD)
+	 docker run -it -p $(PORT):$(PORT) opencre:$(shell git rev-parse HEAD)
 
 lint:
 	[ -d "./venv" ] && . ./venv/bin/activate && black . && yarn lint