diff --git a/requirements/cltk.txt b/requirements/cltk.txt
index 6b1f132..7a31354 100644
--- a/requirements/cltk.txt
+++ b/requirements/cltk.txt
@@ -4,7 +4,7 @@ gitdb2==2.0.3
 GitPython==2.1.8
 python-crfsuite==0.9.5
 pyuca==1.2
-PyYAML==3.12
+PyYAML==5.4
 regex==2018.2.21
 smmap2==2.0.3
 Whoosh==2.7.4