diff --git a/opam b/opam
index 0cb1f94df2d2246107c4b210f44b9641a997dee3..51dcfcb4f4ea5c144c80e4fc3cef99b6eccb3245 100644
--- a/opam
+++ b/opam
@@ -9,6 +9,6 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: [ "sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/iron" ]
 depends: [
-  "coq-iris" { (= "dev.2019-03-06.2.f5d03e25") | (= "dev") }
+  "coq-iris" { (= "dev.2019-04-24.0.d2f8b689") | (= "dev") }
 ]
 
diff --git a/theories/heap_lang/lang.v b/theories/heap_lang/lang.v
index 7829395810adbbaaa671b75be95f0682d7ddfb98..b9e5267eebff9ffa59c411557e6b4e8b6e9f8e2f 100644
--- a/theories/heap_lang/lang.v
+++ b/theories/heap_lang/lang.v
@@ -38,7 +38,7 @@ Instance binder_eq_dec_eq : EqDecision binder.
 Proof. solve_decision. Defined.
 
 Instance set_unfold_cons_binder x mx X P :
-  SetUnfold (x ∈ X) P → SetUnfold (x ∈ mx :b: X) (BNamed x = mx ∨ P).
+  SetUnfoldElemOf x X P → SetUnfoldElemOf x (mx :b: X) (BNamed x = mx ∨ P).
 Proof.
   constructor. rewrite -(set_unfold (x ∈ X) P).
   destruct mx; rewrite /= ?elem_of_cons; naive_solver.