Update Project.toml

Author: ChrisRackauckas

Project.toml

@@ -1,7 +1,7 @@
 name = "DiffEqProblemLibrary"
 uuid = "a077e3f3-b75c-5d7f-a0c6-6bc4c8ec64a9"
 authors = ["Chris Rackauckas <[email protected]>"]
-version = "4.7.0"
+version = "4.6.0"
 
 [deps]
 DiffEqBase = "2b5f629d-d688-5b77-993f-72d75c75574e"
@@ -13,7 +13,7 @@ ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 
 [compat]
-DiffEqBase = ">= 5.15.0"
+DiffEqBase = "6"
 DiffEqBiological = "4.0"
 DiffEqOperators = "4"
 ModelingToolkit = "0.9, 0.10, 1.0"