diff --git a/docs/conf.py b/docs/conf.py
index b550bb40..a8e393bd 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -20,7 +20,6 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('.'))
-sys.path.insert(0, os.path.abspath('../python/matrix_io'))
 
 # Exclude build directory and Jupyter backup files:
 exclude_patterns = ['_build', '**.ipynb_checkpoints']
@@ -116,7 +115,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
diff --git a/docs/requirements.txt b/docs/requirements.txt
index a5023af6..99f7f5bb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,6 @@
 ipython
 sphinx>=1.4
+sphinx_rtd_theme
 ipykernel
 nbsphinx
 pygments>=2.6.1