diff --git a/README.md b/README.md
index 54a5a0faf..42f23e59a 100644
--- a/README.md
+++ b/README.md
@@ -23,4 +23,4 @@ To add documentation for a version:
   `<!-- insert here -->` comment, and changing the `href` locations
   appropriately.
 
-- Finally, run `python3 update.py` and commit all changes.
+- Finally, run `pip install packaging; python3 update.py` and commit all changes.
diff --git a/update.py b/update.py
index 03df5d972..61e3f1bda 100755
--- a/update.py
+++ b/update.py
@@ -7,7 +7,7 @@
 import os
 import argparse
 import html.parser
-from pkg_resources import parse_version
+from packaging.version import parse as parse_version
 
 
 class Scaper(html.parser.HTMLParser):