Pin setuptools-scm build time dependency

CHANGES.md

@@ -13,6 +13,7 @@
   trailing comma (#2384)
 - Parsing support has been added for unparenthesized walruses in set literals, set
   comprehensions, and indices (#2447).
+- Pin `setuptools-scm` build-time dependency version (#2457)
 
 ### _Blackd_
 

pyproject.toml

@@ -23,7 +23,10 @@ extend-exclude = '''
 # NOTE: You don't need this in your own Black configuration.
 
 [build-system]
-requires = ["setuptools>=41.0", "setuptools-scm", "wheel"]
+# We're pinning setuptools-scm to bugfix versions only because for build-time
+# deps having them work on install by default is really important. Especially
+# since it's hard for users to work-around the specified build requirements.
+requires = ["setuptools>=41.0", "setuptools_scm~=6.0.1", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.pytest.ini_options]

setup.cfg

@@ -1,2 +1,3 @@
 [options]
-setup_requires = setuptools_scm
+setup_requires =
+  setuptools_scm~=6.0.1