diff --git a/requirements.txt b/requirements.txt
index e16fad0..ec38678 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ numpy==1.12.1
 openpyxl==2.4.7
 pathlib==1.0.1
 pyparsing==2.2.0
-PyYAML==3.12
+PyYAML==5.4
 rdflib==4.2.2
 rdflib-jsonld==0.4.0
 requests==2.14.2