diff --git a/environment.yml b/environment.yml
index f3b7b11f..8aa5f34f 100644
--- a/environment.yml
+++ b/environment.yml
@@ -15,7 +15,7 @@ dependencies:
   - numcodecs >=0.12  # github.com/valeriupredoi/PyActiveStorage/issues/162
   - numpy !=1.24.3  # severe masking bug
   - pip !=21.3
-  - s3fs
+  - s3fs >=2024.2.0  # loose s3fs deps leading to old aiobotocore for <2024.2.0
   # pin Zarr to avoid using old KVStore interface
   # see github.com/zarr-developers/zarr-python/issues/1362
   - zarr >=2.13.6  # KVStore to FSStore
diff --git a/setup.py b/setup.py
index 47fa908c..ed771420 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
         'netcdf4',
         'numcodecs>=0.12',  # github/issues/162
         'numpy!=1.24.3',  # severe masking bug
-        's3fs',
+        's3fs>=2024.2.0',  # see environment.yml for pin reason
         # pin Zarr to use new FSStore instead of KVStore
         'zarr>=2.13.3', # github.com/zarr-developers/zarr-python/issues/1362
         # for testing