diff --git a/ci/environment-py38.yml b/ci/environment-py38.yml
index 68f6287..6b877da 100644
--- a/ci/environment-py38.yml
+++ b/ci/environment-py38.yml
@@ -13,7 +13,7 @@ dependencies:
   - pip
   - pydap
   - pytest
-  - rasterio
+  - rasterio <= 1.3.6
   - s3fs >= 2021.08.0
   - scikit-image
   - rangehttpserver