diff --git a/environment.yml b/environment.yml
index 02e8be199ce9e66ae61d11c70ab56a5f08f282d4..6f51d929d4e737bfbf02a6f1e6a7bb2235f0bf01 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,4 +6,6 @@ channels:
 
 dependencies:
   # Python packages that cannot be installed from PyPI:
-  - iris
\ No newline at end of file
+  - python<3.9
+  - six
+  - iris==3.0.1
diff --git a/setup.py b/setup.py
index 59082e67038596c102db7e2e04c2ea7b890aab14..f4779bb6cbd91f742d0c771ac625ccca7ac79f7a 100644
--- a/setup.py
+++ b/setup.py
@@ -14,9 +14,12 @@ REQUIREMENTS = {
         'setuptools_scm',
     ],
     'install': [
+        #'dask[array]', 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',
+        'scitools-iris==3.0.1',
         'six',
     ],
     'gpu': [