1 files changed, 7 insertions, 4 deletions
diff --git a/Pipfile b/Pipfile
index 3fd334e..8947189 100644
--- a/Pipfile
+++ b/Pipfile
@@ -11,14 +11,17 @@ name = "pypi"
 [dev-packages]
 flake8 = "*"
 flake8-annotations = "*"
+isort = "*"
 mypy = "*"
 pytest = "*"
-pytest-cov = "*"
 pytest-codeblocks = "*"
-typing_extensions = "*"
-yapf = "*"
-isort = "*"
+pytest-cov = "*"
 requests = "*"
+typing_extensions = "*"
+
+# must lock black to an exact version because it is still "beta"
+# see: https://github.com/psf/black/issues/517
+black = "==21.9b0"
 
 [requires]
 python_version = "3.8"