diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index 13b76adf93cb0ac7d11d2c4a17dc6fbc07c2a250..6b1f95270d08b001a278047b18cd0ffc164d7c0e 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.2021-09-27.0.38392de4") | (= "dev") }
+  "coq-iris" { (= "dev.2021-10-01.0.b9315f85") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]