diff --git a/docs/Project.toml b/docs/Project.toml
index 30d7aef81..43ec63fa0 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -43,7 +43,7 @@ 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"
 CairoMakie = "0.15"