diff --git a/poseidon2.nimble b/poseidon2.nimble
index 013aae6..131eac7 100644
--- a/poseidon2.nimble
+++ b/poseidon2.nimble
@@ -3,4 +3,4 @@ author = "nim-poseidon2 authors"
 description = "Poseidon2 hash function"
 license = "MIT"
 
-requires "https://github.com/mratsim/constantine"
+requires "https://github.com/mratsim/constantine#ab6fa6ae1bbbd1b10071a92ec209b381b5d82511"