diff --git a/pyproject.toml b/pyproject.toml
index 1b1a3c11675eb1190a6a78f2651c7e357934218d..f2414a836d280c43bfef3a211ed0a868efa3d4ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ dynamic = ["version", "readme"]
 dependencies = [
           "numpy>=1.21",
           "scipy>=1.6",
+          "lmfit",
           "scikit-learn>=1.2.0",
           "torch",
           ]