diff --git a/tests/letstest/scripts/test_sdists.sh b/tests/letstest/scripts/test_sdists.sh
index aa12d5610..525266831 100755
--- a/tests/letstest/scripts/test_sdists.sh
+++ b/tests/letstest/scripts/test_sdists.sh
@@ -12,12 +12,7 @@ sudo $BOOTSTRAP_SCRIPT
 # We strip the hashes because the venv creation script includes unhashed
 # constraints in the commands given to pip and the mix of hashed and unhashed
 # packages makes pip error out.
-python3 tools/strip_hashes.py letsencrypt-auto-source/pieces/dependency-requirements.txt > requirements.txt
-# We also strip out the requirement for enum34 because it cannot be installed
-# in newer versions of Python 3, tools/strip_hashes.py removes the environment
-# marker that'd normally prevent it from being installed, and this package is
-# not needed for any OS tested here.
-sed -i '/enum34/d' requirements.txt
+python3 tools/strip_hashes.py tools/certbot_constraints.txt > requirements.txt
 CERTBOT_PIP_NO_BINARY=:all: tools/venv.py --requirement requirements.txt
 . "$VENV_PATH/bin/activate"
 # pytest is needed to run tests on some of our packages so we install a pinned version here.