diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index 1a6efc470f..1120904bee 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -16,6 +16,6 @@ flake8==3.9.2
 pytest-cov==2.7.1
 pytest-doctestplus==0.4.0
 h5py==2.10.0
-s3fs==0.5.1; python_version > '3.6'
-fsspec==0.8.4; python_version > '3.6'
+s3fs==2021.5.0; python_version > '3.6'
+fsspec==2021.5.0; python_version > '3.6'
 moto[server]>=1.3.14; python_version > '3.6'