diff --git a/opam b/opam
index aa78b4dec64e5a4c48103ec7904c4d0a6becc7ef..eccc8d220d69a7ca2a646b63f6d48aaa0602418a 100644
--- a/opam
+++ b/opam
@@ -11,5 +11,5 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: [ "sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/lrust'" ]
 depends: [
-  "coq-iris" { (= "dev.2017-12-07.2") | (= "dev") }
+  "coq-iris" { (= "dev.2017-12-18.1") | (= "dev") }
 ]