diff --git a/environment.yml b/environment.yml
index bd591109..fd42d47c 100644
--- a/environment.yml
+++ b/environment.yml
@@ -10,15 +10,15 @@ dependencies:
   - matplotlib
   - nctoolkit >=0.8.7  # use linux64 build
   - netcdf4
-  - numpy !=1.24.3
+  - numpy >1.24.3, <1.25  # basemap=1.3.7 needs <1.25
   - pip !=21.3
   - python >=3.9
   - pyyaml
-  - scipy
+  - scipy >=1.6
   - scikit-learn
   # Python packages - dependencies for testing
   - flake8
-  - iris
+  - iris >=3.4.0
   - pytest >=3.9,!=6.0.0rc1,!=6.0.0
   - pytest-cov >=2.10.1
   - pytest-env
diff --git a/setup.py b/setup.py
index 859c7f46..015512b2 100755
--- a/setup.py
+++ b/setup.py
@@ -29,20 +29,20 @@
         'matplotlib',
         'nctoolkit>=0.8.7',  # use linux64 build
         'netcdf4',
-        'numpy!=1.24.3',
+        'numpy>1.24.3,<1.25',  # basemap 1.3.7 needs <1.25
         'pip!=21.3',
         'pyyaml',
         'scikit-learn',
-        'scipy',
+        'scipy>=1.6',
     ],
     # Test dependencies
     # Execute 'python setup.py test' to run tests
     'test': [
         'flake8',
+        'scitools-iris>=3.4.0',
         'pytest>=3.9,!=6.0.0rc1,!=6.0.0',
         'pytest-cov>=2.10.1',
         'pytest-env',
-        'pytest-flake8>=1.0.6',
         'pytest-html!=2.1.0',
         'pytest-metadata>=1.5.1',
         'pytest-mypy',
@@ -58,7 +58,7 @@
         'isort',
         'pre-commit',
         'prospector[with_pyroma,with_mypy]>=1.9.0',
-        'sphinx>2',
+        'sphinx>=5',
         'sphinx_rtd_theme',
         'vprof',
         'yamllint',