diff --git a/python27_requirements.txt b/python27_requirements.txt
index 7ff2372..3c889f9 100644
--- a/python27_requirements.txt
+++ b/python27_requirements.txt
@@ -1,5 +1,5 @@
 matplotlib==2.0.2
-numpy==1.15.3
+numpy==1.22.0
 pandas==0.24.2
 PyClone==0.13.1
 PyDP==0.2.4
diff --git a/python36_requirements.txt b/python36_requirements.txt
index 19f66ce..270ef5a 100644
--- a/python36_requirements.txt
+++ b/python36_requirements.txt
@@ -4,7 +4,7 @@ Cython==0.29.13
 kiwisolver==1.0.1
 lifelines==0.22.3
 matplotlib==3.0.2
-numpy==1.16.4
+numpy==1.22.0
 pandas==0.24.2
 scikit-learn==0.20.3
 scipy==1.1.0