diff --git a/opam.pins b/opam.pins
index b496f750fc3ef03c16bcba873827a7483400ccee..607c346aae6510fc42352c82e3ae8e7e527ac244 100644
--- a/opam.pins
+++ b/opam.pins
@@ -1 +1 @@
-coq-iris https://gitlab.mpi-sws.org/FP/iris-coq 02bc52b4d905eb635940ff8545d59676ad44ea8c
+coq-iris https://gitlab.mpi-sws.org/FP/iris-coq c3dde6181d7d99007fd584d23a5dc3e859b47765
diff --git a/theories/lang/lang.v b/theories/lang/lang.v
index 70f6f9069c405e64868a9cb9feb8b2948efe6ab0..9ec5db995b6bd7f7bcbc54a03ef73c940e13df7f 100644
--- a/theories/lang/lang.v
+++ b/theories/lang/lang.v
@@ -1,5 +1,5 @@
 From iris.program_logic Require Export language ectx_language ectxi_language.
-From stdpp Require Export strings.
+From fast_string Require Export fast_string_lib.
 From stdpp Require Import gmap.
 Set Default Proof Using "Type".
 
diff --git a/theories/lifetime/lifetime_sig.v b/theories/lifetime/lifetime_sig.v
index 4684b65d115f0ae967368e629234dcd33e5d3632..89a403a30735f39c5fb16fd8a9af9bf212460918 100644
--- a/theories/lifetime/lifetime_sig.v
+++ b/theories/lifetime/lifetime_sig.v
@@ -1,5 +1,6 @@
 From iris.algebra Require Import frac.
-From stdpp Require Export gmultiset strings.
+From stdpp Require Export gmultiset.
+From fast_string Require Export fast_string_lib.
 From iris.base_logic.lib Require Export invariants.
 From iris.base_logic.lib Require Import boxes fractional.
 Set Default Proof Using "Type".