diff --git a/test/Project.toml b/test/Project.toml
index 20ae16b44..cc0476bdf 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -40,6 +40,7 @@ Compat = "4.3.0"
 DifferentiationInterface = "0.6.41, 0.7"
 Distributions = "0.25"
 DistributionsAD = "0.6.3"
+Documenter = "1"
 EnzymeCore = "0.6 - 0.8"
 ForwardDiff = "0.10.12"
 JET = "0.9, 0.10"