diff --git a/environment.yml b/environment.yml
index 7cbbbef8a1..b18c7f3413 100644
--- a/environment.yml
+++ b/environment.yml
@@ -12,19 +12,19 @@ dependencies:
   - dask
   - dask-jobqueue
   - distributed
-  - esgf-pyclient>=0.3.1
-  - esmpy!=8.1.0
+  - esgf-pyclient >=0.3.1
+  - esmpy !=8.1.0
   - filelock
   - fiona
   - fire
   - geopy
   - humanfriendly
   - importlib_resources
-  - iris>=3.6.0
-  - iris-esmf-regrid >=0.7.0  # to work with latest esmpy
+  - iris >=3.6.0
+  - iris-esmf-regrid >=0.7.0
   - isodate
   - jinja2
-  - libnetcdf!=4.9.1 # to avoid hdf5 warnings
+  - libnetcdf !=4.9.1  # to avoid hdf5 warnings
   - nc-time-axis
   - nested-lookup
   - netcdf4
@@ -32,32 +32,32 @@ dependencies:
   - packaging
   - pandas
   - pillow
-  - pip!=21.3
+  - pip !=21.3
   - prov
   - psutil
   - py-cordex
   - pybtex
-  - python>=3.9
-  - python-stratify>=0.3
+  - python >=3.9
+  - python-stratify >=0.3
   - pyyaml
   - requests
-  - scipy>=1.6
+  - scipy >=1.6
   - shapely >=2.0.0
   - yamale
   # Python packages needed for building docs
-  - autodocsumm>=0.2.2
+  - autodocsumm >=0.2.2
   - ipython
   - nbsphinx
-  - sphinx>=6.1.3
+  - sphinx >=6.1.3
   - pydata-sphinx-theme
   # Python packages needed for testing
   - flake8
-  - mypy>=0.990
-  - pytest>=3.9,!=6.0.0rc1,!=6.0.0
-  - pytest-cov>=2.10.1
+  - mypy >=0.990
+  - pytest >=3.9,!=6.0.0rc1,!=6.0.0
+  - pytest-cov >=2.10.1
   - pytest-env
-  - pytest-html!=2.1.0
-  - pytest-metadata>=1.5.1
+  - pytest-html !=2.1.0
+  - pytest-metadata >=1.5.1
   - pytest-mypy
   - pytest-mock
   - pytest-xdist