diff --git a/pyproject.toml b/pyproject.toml
index 7703ce71f9..2f04857daf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -98,7 +98,7 @@ lmp = [
     "lammps~=2023.8.2.3.0",
 ]
 ipi = [
-    "i-PI",
+    "ipi",
 ]
 gui = [
     "dpgui",