diff --git a/requirements.txt b/requirements.txt
index 0319863..83b5aee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,6 @@ brian2
 nevergrad==0.3.0
 scikit-optimize
 scikit-learn!=0.23.0
+lmfit
 tqdm
 efel
diff --git a/setup.py b/setup.py
index b7554f1..fefbc13 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,8 @@ def readme():
                         'nevergrad>=0.2,<=0.3',
                         'scikit-optimize',
                         'efel',
-                        'tqdm'
+                        'tqdm',
+                        'lmfit'
                         ],
       provides=['brian2modelfitting'],
       extras_require={'test': ['pytest'],