diff --git a/doc/requirements.txt b/doc/requirements.txt
index e89b4352..915db4cd 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,4 @@
-sphinx_rtd_theme==1.0.0
-
+sympy
+scipy
+numpy
+sphinx_rtd_theme