diff --git a/requirements.txt b/requirements.txt
index d5dd44c08..5ef20f84b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,8 @@ MarkupSafe==0.23
 Pygments==2.0.2
 pyPEG2==2.15.2
 PyYAML==3.11
-colorama==0.3.3
+# "ValueError: I/O operation on closed file" with pytest since 0.3.5
+# WORKAROUND for https://github.com/tartley/colorama/issues/81
+colorama==0.3.3  # rq.filter: <=0.3.3
 colorlog==2.6.0
 cssutils==1.0.1