diff --git a/Project.toml b/Project.toml
index b9d984ab..12c3259a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -29,7 +29,7 @@ Unzip = "41fe7b60-77ed-43a1-b4f0-825fd5a5650d"
 [compat]
 CavityTools = "0.2.1"
 Distributions = "0"
-IndexedGraphs = "0.3"
+IndexedGraphs = "0.3, 0.4"
 InvertedIndices = "1"
 Lazy = "0"
 LogExpFunctions = "0"