diff --git a/Project.toml b/Project.toml
index 2a4224e1..31489744 100644
--- a/Project.toml
+++ b/Project.toml
@@ -46,6 +46,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 Weave = "44d3d7a6-8a23-5bf8-98c5-b353f8df5ec9"
 
 [compat]
+DiffEqOperators = "4.3"
 ForwardDiff = "0.10"
 SparseDiffTools = "0.10"
 Distributions = "0.21"