diff --git a/requirements.txt b/requirements.txt
index 4516340d7..fe8da411c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,4 @@ Jinja2==2.10
 MarkupSafe==1.0
 Pygments==2.2.0
 pyPEG2==2.15.2
-PyYAML==3.13b1  # rq.filter: != 4.1
+PyYAML==4.2b4  # rq.filter: != 4.1