diff --git a/test/Project.toml b/test/Project.toml
index dcfd3442..184a2b0d 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -34,6 +34,7 @@ ChainRulesTestUtils = "0.7, 1"
 ChangesOfVariables = "0.1"
 Combinatorics = "1.0.2"
 DistributionsAD = "0.6.3"
+Documenter = "1"
 Enzyme = "0.13.12"
 EnzymeTestUtils = "0.2.1"
 FillArrays = "1"