diff --git a/test/Project.toml b/test/Project.toml
index 0c014a193..927954ba4 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -39,6 +39,7 @@ Accessors = "0.1"
 Aqua = "0.8"
 BangBang = "0.4"
 Bijectors = "0.15.1"
+Chairmarks = "1"
 Combinatorics = "1"
 DifferentiationInterface = "0.6.41, 0.7"
 Distributions = "0.25"