diff --git a/bench/Project.toml b/bench/Project.toml
index 31d2d4c0..5777112d 100644
--- a/bench/Project.toml
+++ b/bench/Project.toml
@@ -30,7 +30,7 @@ ForwardDiff = "0.10"
 InteractiveUtils = "1"
 LogDensityProblems = "2"
 Mooncake = "0.4.5"
-Optimisers = "0.3"
+Optimisers = "0.3, 0.4"
 Random = "1"
 ReverseDiff = "1"
 SimpleUnPack = "1"