diff --git a/coq-lambda-rust.opam b/coq-lambda-rust.opam
index 092adc7fd008cda94c2cb2e96d1467f53f890588..6fd2e6add12a5396362ff20abd8870bf6c0ed480 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.2021-05-07.0.f60c92f1") | (= "dev") }
+  "coq-gpfsl" { (= "dev.2021-05-20.0.ad7deb79") | (= "dev") }
 ]
 
 build: [make "-j%{jobs}%"]