diff --git a/Project.toml b/Project.toml
index 376200ca..07e4945c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -35,7 +35,7 @@ Distributions = "0.25"
 DocStringExtensions = "0.9"
 Enzyme = "0.11, 0.12"
 ForwardDiff = "0.10.25"
-Optimisers = "0.2.16, 0.3"
+Optimisers = "0.2.16, 0.3, 0.4"
 ProgressMeter = "1.0.0"
 Requires = "1"
 ReverseDiff = "1.14"