diff --git a/requirements.txt b/requirements.txt
index a799e3f..0d81b12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ elasticsearch==1.9.0
 packaging==16.8
 pyparsing==2.1.10
 python-dateutil==2.6.0
-PyYAML==3.12
+PyYAML==5.4
 requests==2.13.0
 -e git+https://github.com/EHRI/resync.git@ehribranch#egg=resync
 -e git+https://github.com/EHRI/rspub-core.git@master#egg=rspub-core