diff --git a/requirements.txt b/requirements.txt
index 9bb440b3a..df89a1983 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-docutils>=0.14,<0.19
+docutils==0.16.0  # Compatibility with sphinx-tabs 3.2.0.
 jinja2<3.1  # Compatibility with Sphinx 3.5.4.
 libsass==0.18.0
 pygments~=2.6.1
 pygments-csv-lexer~=0.1
 sphinx~=3.0
-sphinx-tabs~=3.2.0
+sphinx-tabs==3.2.0
 werkzeug==0.14.1