diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index b7318d68abf54fd0442e7409f3c291aff9420bba..13b76adf93cb0ac7d11d2c4a17dc6fbc07c2a250 100644
--- a/coq-lambda-rust.opam
+++ b/coq-lambda-rust.opam
@@ -13,7 +13,7 @@ the type system, and safety proof for some Rust libraries.
 """
 
 depends: [
-  "coq-iris" { (= "dev.2021-09-25.0.467fa48b") | (= "dev") }
+  "coq-iris" { (= "dev.2021-09-27.0.38392de4") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]