diff --git a/setup.py b/setup.py
index f4779bb6cbd91f742d0c771ac625ccca7ac79f7a..c60841d6896efce29b5c9b2cd08c69b1eacb1c6f 100644
--- a/setup.py
+++ b/setup.py
@@ -14,11 +14,11 @@ REQUIREMENTS = {
         'setuptools_scm',
     ],
     'install': [
-        #'dask[array]', I have doubts about this one, because it's in the setup of
+        #'dask[array]==2022.1.0, #I have doubts about this one, because it's in the setup of
         # earthdiagnostics but it does not get used in there, but rather in diagonals
         'netCDF4',
         'numba==0.52',
-        'numpy',
+        'numpy==1.21.5',
         'scitools-iris==3.0.1',
         'six',
     ],