diff --git a/dune-project b/dune-project
index 18fcc9d..2f9f0f8 100644
--- a/dune-project
+++ b/dune-project
@@ -2,7 +2,7 @@
 (using menhir 3.0)
 
 (name hsim)
-(license "GPL-3.0-or-later")
+(license "CeCILL-2.1-or-later")
 
 (authors     "Henri Saudubray")
 (maintainers "henri.saudubray@proton.me")