diff --git a/docs/Project.toml b/docs/Project.toml
index 3e0338f9..84e2c0b4 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -44,7 +44,7 @@ MLJIteration = "0.6"
 PlutoStaticHTML = "4.0.5, 5, 6"
 PlutoUI = "0.7"
 PosteriorStats = "0.1.1"
-PSIS = "0.9.11"
+PSIS = "0.9.1"
 StanSample = "7.0.1"
 StatisticalMeasures = "0.1"
 Statistics = "1.6"