diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index e968f4f318e978ca46692f42d9862a0154d40adf..3c154ba7cbfdee548176e2c323b994c6db6d5a46 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.2021-07-28.0.3424ace5") | (= "dev") }
+  "coq-iris" { (= "dev.2021-07-28.2.fb31118e") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]