diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index e0929c2987b5fa0c8723c7d836a272a53d6a86d6..80244a85afcd96ff6aae2dfa89769e43c9f7cf28 100644
--- a/coq-lambda-rust.opam
+++ b/coq-lambda-rust.opam
@@ -15,7 +15,7 @@ This branch uses a proper weak memory model.
 """
 
 depends: [
-  "coq-gpfsl" { (= "dev.2021-09-14.0.013913bf") | (= "dev") }
+  "coq-gpfsl" { (= "dev.2021-09-27.0.77618673") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]