diff --git a/irmin.opam b/irmin.opam
index 0ae924ed2c..323416da86 100644
--- a/irmin.opam
+++ b/irmin.opam
@@ -44,7 +44,7 @@ depends: [
 
 pin-depends: [
   # Fix segv in kcas
-  [ "kcas.dev" "git+https://git@github.com/ocaml-multicore/kcas#5f3a39dfc72189e2b83f96c3754d402d5e7d6bc5"]
+  [ "kcas.dev" "git+https://git@github.com/ocaml-multicore/kcas#debeae67a48743f9659471a4de3b9166afdb1647"]
   # Metrics may have been unnecessarily constrained in opam-repository
   [ "metrics.dev" "git+https://github.com/mirage/metrics#995eb18d2837df02c8ead719c00fb156cf475ab5"]
   [ "metrics-unix.dev" "git+https://github.com/mirage/metrics#995eb18d2837df02c8ead719c00fb156cf475ab5"]