diff --git a/Project.toml b/Project.toml
index 397b053..0a55dc6 100644
--- a/Project.toml
+++ b/Project.toml
@@ -25,6 +25,7 @@ PlottingSPM = "Plots"
 DataFrames = "1.6.1"
 Distributions = "<0.25.102, 0.25"
 GLM = "1.9.0"
+NLopt = "1"
 Parameters = "<0.12.4"
 StatsBase = "<0.34.3"
 julia = "1.9"