diff --git a/Project.toml b/Project.toml
index 10120c77..343f77d2 100644
--- a/Project.toml
+++ b/Project.toml
@@ -39,6 +39,7 @@ Ipopt = "1.4"
 JLD2 = "0.4"
 MathOptInterface = "1.20"
 NamedTrajectories = "0.1"
+QuantumOpticsBase = "0.5"
 Reexport = "1.2"
 TestItems = "0.1"
 TrajectoryIndexingUtils = "0.1"