diff --git a/docs/requirements.txt b/docs/requirements.txt
index 713e48d4..4d745bf6 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,7 @@
 docutils==0.17
-sphinx-argparse
+sphinx-argparse==0.4.0
 sphinx_rtd_theme>=1.0.0
 snakebids>=0.4.0
-myst-parser
-sphinxcontrib.asciinema
+myst-parser==1.0.0
+sphinxcontrib.asciinema==0.3.7
 pulp<2.8.0