diff --git a/doc/conf.py b/doc/conf.py
index 2998545..510c506 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -27,6 +27,7 @@
 
 # If your documentation needs a minimal Sphinx version, state it here.
 #needs_sphinx = '1.0'
+needs_sphinx = '3.2.1'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -34,7 +35,7 @@
 extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.viewcode',
-    'sphinxcontrib.napoleon',
+    "sphinx.ext.napoleon",
 ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/requirements.txt b/requirements.txt
index 2f9b639..9e8c9f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,2 @@
 pyserial>=3
-sphinxcontrib-napoleon
 srp
\ No newline at end of file