diff --git a/test/Project.toml b/test/Project.toml
index ef1d36b1d..8d9b19bce 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -50,6 +50,7 @@ LogDensityProblemsAD = "1.7.0"
 MCMCChains = "6.0.4"
 MacroTools = "0.5.6"
 Mooncake = "0.4.59"
+OrderedCollections = "1"
 ReverseDiff = "1"
 StableRNGs = "1"
 Tracker = "0.2.23"