diff --git a/requirements.txt b/requirements.txt
index c5ac5ae..5ca8e24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ nbformat==4.4.0
 nbval==0.9.1
 netCDF4==1.4.0
 notebook==5.6.0
-numpy==1.15.0
+numpy==1.22.0
 pandas==0.23.4
 pandocfilters==1.4.2
 parcels==1.0.4.dev125+g5516597