diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 00000000..b8541a5e
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,3 @@
+sphinxcontrib-applehelp<1.0.8
+Sphinx<5.0
+sphinx_rtd_theme<2.0.0