diff --git a/docs/Project.toml b/docs/Project.toml
index cd40d4a03..d2cfa1d63 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -39,7 +39,7 @@ CTBase = "0.30"
 CTDirect = "1"
 CTFlows = "0.18"
 CTLie = "0.2"
-CTModels = "0.19"
+CTModels = "0.19, 0.18"
 CTParser = "0.9"
 CTSolvers = "0.5"
 CUDA = "6"