diff --git a/CHANGES.rst b/CHANGES.rst
index 019c6fdd..1ab9d638 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,7 +1,7 @@
 0.2.4 (unreleased)
 ==================
 
-
+Workaround for setuptools_scm issues with recent versions of pip. [#45]
 
 0.2.3 (2021-08-06)
 ==================
diff --git a/setup.cfg b/setup.cfg
index 5df79b3b..1acbeda9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,6 +20,9 @@ zip_safe = True
 python_requires = >=3.7
 setup_requires =
     setuptools_scm
+    # This requirement forces readthedocs.io to install the
+    # minimum version of packaging that setuptools_scm needs.
+    packaging>=17
 
 install_requires =
     numpy>=1.17
diff --git a/setup.py b/setup.py
index 36f7fe77..42e89de9 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
 from setuptools import setup
 
-setup()
+# This should be enabled by pyproject.toml, but that doesn't seem
+# to work with pip 21.2.4.
+setup(use_scm_version={"write_to": "src/stcal/_version.py"})