diff --git a/pyproject.toml b/pyproject.toml
index 7229afa83..ab3ecd775 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ dependencies = [
    "typing_extensions",
    "pycountry",
    "airportsdata",
-   "outlines_core",
+   "outlines_core==0.1.0",
 ]
 dynamic = ["version"]