diff --git a/Project.toml b/Project.toml
index b10cf590..c3ab4693 100644
--- a/Project.toml
+++ b/Project.toml
@@ -32,7 +32,7 @@ CTFlows = "0.16"
 CTLie = "0.1"
 CTModels = "0.15"
 CTParser = "0.8"
-CTSolvers = "0.4"
+CTSolvers = "0.4, 0.5"
 CUDA = "5, 6"
 CUDSS = "0.6, 0.7, 0.8"
 CommonSolve = "0.2"