diff --git a/pyproject.toml b/pyproject.toml
index f1cbccb3f..6823b9833 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ dependencies = [
   "websocket_client",
 
   # acados deps
-  "casadi >=3.6.6",  # 3.12 fixed in 3.6.6
+  "casadi ==3.6.7",  # pinned to match libcasadi bundled in commaai/dependencies@release-acados
 
   # joystickd
   "inputs",