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-rw-r--r--appveyor.yml2
1 files changed, 1 insertions, 1 deletions
diff --git a/appveyor.yml b/appveyor.yml
index d657a3d..c860c41 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -28,7 +28,7 @@ install:
- "ci_tools/retry.bat %PYTHON% updatezinfo.py"
# This environment variable tells the test suite it's OK to mess with the time zone.
- set DATEUTIL_MAY_CHANGE_TZ=1
- - C:\Python36\python -m pip install -U tox
+ - C:\Python36\python -m pip install -U tox virtualenv==20.4.7
test_script:
- C:\Python36\scripts\tox