diff --git a/Makefile b/Makefile
index 90b8e2b1..91bf61d3 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ install:
 .PHONY: dev_install
 dev_install:
 	pip install poetry
-	poetry install --with dev
+	poetry install --with=dev
 
 
 .PHONY: test