diff --git a/docs/source/requirements.txt b/docs/source/requirements.txt
index 8d129a6..1cbde8e 100644
--- a/docs/source/requirements.txt
+++ b/docs/source/requirements.txt
@@ -1 +1 @@
-sphinx_rtd_theme=1.3.0
+sphinx_rtd_theme==1.3.0