diff --git a/requirements/conda.txt b/requirements/conda.txt
index f3e0cad..3462e70 100644
--- a/requirements/conda.txt
+++ b/requirements/conda.txt
@@ -35,4 +35,5 @@
 
 # pytest is required in every environment to run the test suite
 # against the installed modules.
-pytest
+# Unpin when this is released https://github.com/pytest-dev/pytest-cov/pull/240
+pytest==4.0.2