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-rw-r--r--requirements/dev.pip1
1 files changed, 1 insertions, 0 deletions
diff --git a/requirements/dev.pip b/requirements/dev.pip
index c2cfcb1b..b497deb8 100644
--- a/requirements/dev.pip
+++ b/requirements/dev.pip
@@ -5,6 +5,7 @@
# https://requires.io/github/nedbat/coveragepy/requirements/
pip==18.0.0
+virtualenv==16.0.0
# PyPI requirements for running tests.
-r tox.pip