1 files changed, 3 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index f1055e3a..2bb1ae44 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,9 @@ whitelist_externals = mkdir
 deps = git+git://github.com/cherrypy/cheroot.git@master#egg=cheroot
 
 [testenv:pre-commit]
-deps = pre-commit
+deps =
+    git+https://github.com/yaml/pyyaml@master#egg=pyyaml;python_version=="3.7"
+    pre-commit
 commands = pre-commit run --all-files {posargs}
 
 [testenv:pre-commit-pep257]