diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5fc7bfad4a3..7ed65de73cb 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -244,7 +244,7 @@ jobs:
                   key: v0.3-code_quality-{{ checksum "setup.py" }}
                   paths:
                       - '~/.cache/pip'
-            - run: black --check --line-length 119 --target-version py35 examples templates tests src utils
+            - run: black --check examples templates tests src utils
             - run: isort --check-only examples templates tests src utils
             - run: flake8 examples templates tests src utils
             - run: python utils/check_copies.py
diff --git a/Makefile b/Makefile
index 83998723fc5..6aef4b10f7c 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 # Check that source code meets quality standards
 
 quality:
-	black --check --line-length 119 --target-version py35 examples templates tests src utils
+	black --check examples templates tests src utils
 	isort --check-only examples templates tests src utils
 	flake8 examples templates tests src utils
 	python utils/check_copies.py
@@ -12,7 +12,7 @@ quality:
 # Format source code automatically
 
 style:
-	black --line-length 119 --target-version py35 examples templates tests src utils
+	black examples templates tests src utils
 	isort examples templates tests src utils
 
 # Make marked copies of snippets of codes conform to the original
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000000..291558c9a3d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[tool.black]
+line-length = 119
+target-version = ['py35']