diff --git a/Project.toml b/Project.toml
index ad776d915..a92fab137 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,7 +30,7 @@ CTFlows = "0.18"
 CTLie = "0.2"
 CTModels = "0.19"
 CTParser = "0.9"
-CTSolvers = "0.5"
+CTSolvers = "0.5, 0.6"
 CUDA = "6"
 CUDSS = "0.7"
 CommonSolve = "0.2"