diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index 0d384eb63c3038be319248b998167df8c5d5f824..52fda171784d2a8cfaab88337178c1d7c9592dc2 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.2021-10-02.1.9ed67339") | (= "dev") }
+  "coq-iris" { (= "dev.2021-12-09.1.f52f9f6a") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]