diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9427e28416df..aa48f0756055 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -274,7 +274,6 @@ jobs:
         working_directory: ~/transformers
         docker:
             - image: circleci/python:3.6
-        resource_class: large
         steps:
             - checkout
             - restore_cache:
@@ -295,7 +294,6 @@ jobs:
         working_directory: ~/transformers
         docker:
             - image: circleci/python:3.6
-        resource_class: large
         steps:
             - add_ssh_keys:
                 fingerprints:
diff --git a/setup.py b/setup.py
index 7ffacbff359f..406fbbbdd1ef 100644
--- a/setup.py
+++ b/setup.py
@@ -105,7 +105,7 @@
 extras["retrieval"] = ["faiss-cpu", "datasets"]
 extras["testing"] = ["pytest", "pytest-xdist", "timeout-decorator", "parameterized", "psutil"] + extras["retrieval"]
 # sphinx-rtd-theme==0.5.0 introduced big changes in the style.
-extras["docs"] = ["recommonmark", "sphinx", "sphinx-markdown-tables", "sphinx-rtd-theme==0.4.3", "sphinx-copybutton"]
+extras["docs"] = ["recommonmark", "sphinx==3.2.1", "sphinx-markdown-tables", "sphinx-rtd-theme==0.4.3", "sphinx-copybutton"]
 extras["quality"] = ["black >= 20.8b1", "isort >= 5.5.4", "flake8 >= 3.8.3"]