diff --git a/pyproject.toml b/pyproject.toml
index cf2e7b1..1324791 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,7 @@ dependencies = [
 [project.optional-dependencies]
 sk-util = ["skfolio==0.4.1", "sktime==0.33.1"]
 bayes = [
-    "arviz==0.19.0",
+    "arviz==0.20.0",
     "bambi==0.14.0",
     "pymc==5.16.2",
     "formulae==0.5.4",