diff --git a/Makefile b/Makefile
index 6bfe8db..56dac2b 100644
--- a/Makefile
+++ b/Makefile
@@ -51,8 +51,8 @@ clean-test: ## remove test and coverage artifacts
 	rm -fr htmlcov/
 
 lint: ## reformat with black and check style with flake8
-	isort -rc superx_budget
-	isort -rc tests
+	isort superx_budget
+	isort tests
 	black superx_budget tests
 	flake8 superx_budget tests
 
@@ -80,5 +80,5 @@ repo: devenv ## complete project setup with development environment and git repo
 	git init .
 	git add .
 	git commit -m "import of project template"
-	
+
 	.venv/bin/pre-commit install --install-hooks
diff --git a/pyproject.toml b/pyproject.toml
index 56149ce..c20e414 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ dev = [
     "black",
     "flake8",
     "flake8-comprehensions",
-    "isort",
+    "isort >= 5.0.0",
     "keyring",
     "pre-commit",
 ]