diff --git a/climada/hazard/test/test_tc_tracks.py b/climada/hazard/test/test_tc_tracks.py
index 1dbf615c2..52535c34c 100644
--- a/climada/hazard/test/test_tc_tracks.py
+++ b/climada/hazard/test/test_tc_tracks.py
@@ -60,7 +60,7 @@
         "basin": ("time", ["NA", "NA", "NA", "NA"]),
     },
     coords={
-        "time": ("time", pd.date_range("2025-01-01", periods=4, freq="12H")),
+        "time": ("time", pd.date_range("2025-01-01", periods=4, freq="12h")),
         "lat": ("time", [-90, -89, -88, -87]),
         "lon": ("time", [-179, -169, -159, -149]),
     },
diff --git a/requirements/env_climada.yml b/requirements/env_climada.yml
index c4588ca6d..6e42d55b3 100644
--- a/requirements/env_climada.yml
+++ b/requirements/env_climada.yml
@@ -3,7 +3,7 @@ channels:
   - conda-forge
   - nodefaults
 dependencies:
-  - affine>=2.4,<3.0
+  - affine>=2.4,<3.0  # see #1311, affine 3.0 cannot read metadata from hdf5 files written by climada < 6.1
   - bayesian-optimization>=1.5,<2.0
   - bottleneck>=1.6
   - cartopy>=0.25