diff --git a/docs/docsite/known_good_reqs.txt b/docs/docsite/known_good_reqs.txt
index 75323d13b02286..6000ad6fe30478 100644
--- a/docs/docsite/known_good_reqs.txt
+++ b/docs/docsite/known_good_reqs.txt
@@ -1,7 +1,7 @@
 # pip packages required to build docsite
-# tested June 9 2021
+# tested April 14 2022
 
-antsibull
+antsibull==0.42.0
 # version floats free, since we control features and releases
 docutils==0.16
 # check unordered lists when testing more recent docutils versions