diff --git a/requirements/core.txt b/requirements/core.txt
index 09ffb8954c..f938159cc8 100644
--- a/requirements/core.txt
+++ b/requirements/core.txt
@@ -10,5 +10,5 @@ cftime
 dask[array]  #conda: dask
 matplotlib>=2,<3
 netcdf4
-numpy>=1.14
+numpy>=1.14,!=1.15.2
 scipy