diff --git a/environment.yml b/environment.yml
index f326dc071..4506cb1dd 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,7 +5,7 @@ channels:
   - nodefaults
 dependencies:
   - python=3.10  # dev
-  - cyipopt  # dev
+  - cyipopt<=1.2.0  # dev
   - jupyterlab  # dev, docs
   - nb_black  # dev, docs
   - nlopt  # dev, tests
diff --git a/src/estimagic/optimization/tranquilo.py b/src/estimagic/optimization/tranquilo.py
index 4c989fb66..6574d936c 100644
--- a/src/estimagic/optimization/tranquilo.py
+++ b/src/estimagic/optimization/tranquilo.py
@@ -6,7 +6,7 @@
     from functools import partial
     from estimagic.decorators import mark_minimizer
 
-    tranquilo_scalar = mark_minimizer(
+    tranquilo = mark_minimizer(
         func=partial(_tranquilo, functype="scalar"),
         name="tranquilo",
         primary_criterion_entry="value",
@@ -24,6 +24,6 @@
         is_global=False,
     )
 
-    __all__ = ["tranquilo_scalar", "tranquilo_ls"]
+    __all__ = ["tranquilo", "tranquilo_ls"]
 else:
     __all__ = []