diff --git a/requirements-docs.txt b/requirements-docs.txt
index 4b0538e2..c3e63e56 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,8 +1,4 @@
 # requirements for building sphinx docs
-pygments==2.4.1
-sphinx
-sphinx_rtd_theme
-sphinx_markdown_tables
-sphinx_book_theme
-recommonmark
-nbsphinx
+sphinx_book_theme==0.3.3
+sphinx_markdown_tables==0.0.15
+recommonmark==0.7.1