diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d298a41e..0e58eba1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -63,7 +63,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.8
+          # Mininum supported Python version
+          python-version: 3.6
       - name: Install dependencies
         run: python -m pip install tox
       - name: Build docs
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index d0d0d34c..2151c3dd 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -14,7 +14,8 @@ formats:
   - epub
 
 python:
-  version: 3.8
+  # Mininum supported Python version
+  version: "3.6"
   install:
     - requirements: docs/requirements.txt
     - method: pip
diff --git a/docs/conf.py b/docs/conf.py
index 87e86576..9e8bf685 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -272,6 +272,8 @@
     "https://github.com/pypa/twine/issues/*",
     # Avoid errors from channels interpreted as anchors
     "https://web.libera.chat/#",
+    # Avoid error from InvalidPyPIUploadURL docstring
+    "https://upload.pypi.org/legacy",
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.
@@ -282,7 +284,7 @@
 
 # TODO: Try to add these to intersphinx_mapping
 nitpick_ignore_regex = [
-    (r"py:.*", r"(pkginfo|requests)\..*"),
+    (r"py:.*", r"(pkginfo|requests|IO).*"),
 ]
 
 # -- Options for apidoc output ------------------------------------------------