diff --git a/envs/environment.yaml b/envs/environment.yaml
index 41fd6c86..8cb8e565 100644
--- a/envs/environment.yaml
+++ b/envs/environment.yaml
@@ -7,7 +7,7 @@ channels:
   - conda-forge
   - bioconda
 dependencies:
-  - python==3.9
+  - python>=3.8
   - pip
 
   - pypsa>=0.20
@@ -37,14 +37,14 @@ dependencies:
   - pyomo
   - matplotlib
   - proj
-  - fiona # <= 1.18.20  # Till issue https://github.com/Toblerity/Fiona/issues/1085 is not solved
+  - fiona <= 1.18.20  # Till issue https://github.com/Toblerity/Fiona/issues/1085 is not solved
   - country_converter
 
   # Keep in conda environment when calling ipython
   - ipython
 
   # GIS dependencies:
-  - cartopy>=0.16
+  - cartopy
   - descartes
   - rasterio<=1.2.9  # 1.2.10 creates error https://github.com/PyPSA/atlite/issues/238