diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index 9700389408..d51ebf1a23 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -17,6 +17,6 @@ flake8==3.9.2
 pytest-cov==2.12.1
 pytest-doctestplus==0.10.0
 h5py==3.2.1
-s3fs==2021.6.0
+s3fs==2021.7.0
 fsspec==2021.6.0
 moto[server]>=1.3.14