diff --git a/NLPyPort/requirements.txt b/NLPyPort/requirements.txt
index c7766d6..1575dda 100644
--- a/NLPyPort/requirements.txt
+++ b/NLPyPort/requirements.txt
@@ -1,5 +1,5 @@
 nltk==3.4
-numpy==1.16.2
+numpy==1.22.0
 pandas==0.24.2
 python-crfsuite==0.9.6
 python-dateutil==2.8.0