diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b9576e58..e36a8e51b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 3.13.1
+
+- list: TRMC was in 4.14, we can use it earlier
+- fix insidious bug in CCList.flat_map linked to unspecified
+    evaluation order
+- perf: use `concat_map` for `CCList.flat_map` on >= 5.1
+    (this also re-fixes the same bug in `CCList.flat_map` anyway)
+
 ## 3.13
 
 - breaking: delete containers-thread (which was deprecated)
diff --git a/containers-data.opam b/containers-data.opam
index 57845e979..e2fb4ade8 100644
--- a/containers-data.opam
+++ b/containers-data.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "3.13"
+version: "3.13.1"
 synopsis: "A set of advanced datatypes for containers"
 maintainer: ["c-cube"]
 authors: ["c-cube"]
diff --git a/containers.opam b/containers.opam
index e0e46c440..50acf25ae 100644
--- a/containers.opam
+++ b/containers.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "3.13"
+version: "3.13.1"
 synopsis:
   "A modular, clean and powerful extension of the OCaml standard library"
 maintainer: ["c-cube"]
diff --git a/dune-project b/dune-project
index 392ee7558..d05d4b37d 100644
--- a/dune-project
+++ b/dune-project
@@ -2,7 +2,7 @@
 (name containers)
 (generate_opam_files true)
 
-(version 3.13)
+(version 3.13.1)
 (authors c-cube)
 (maintainers c-cube)
 (license BSD-2-Clause)