diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 9c3157c50b..506d1f2d1b 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -15,6 +15,10 @@ build:
   jobs:
     post_create_environment:
       - conda run -n ${CONDA_DEFAULT_ENV} pip install . --no-deps
+      # Print some debugging information:
+      - conda env export
+      - locale
+      - python -m locale
 
 # Declare the requirements required to build your docs
 conda:
diff --git a/environment.yml b/environment.yml
index 09ec1def63..4cb129af72 100644
--- a/environment.yml
+++ b/environment.yml
@@ -36,7 +36,7 @@ dependencies:
   - psutil
   - py-cordex
   - pybtex
-  - python >=3.10
+  - python >=3.10, !=3.13.3
   - python-stratify >=0.3
   - pyyaml
   - requests