diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2daaf363..c1699888 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.0.1
+
+- fix build on 32 bits architectures
+
 ## 3.0
 
 ### Breaking changes
diff --git a/containers-data.opam b/containers-data.opam
index d6fde3ae..b2851d95 100644
--- a/containers-data.opam
+++ b/containers-data.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "3.0"
+version: "3.0.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 synopsis: "A set of advanced datatypes for containers"
diff --git a/containers-thread.opam b/containers-thread.opam
index 319b2d70..03b86cf9 100644
--- a/containers-thread.opam
+++ b/containers-thread.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "3.0"
+version: "3.0.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 synopsis: "An extension of containers for threading"
diff --git a/containers.opam b/containers.opam
index a23ab347..9a90c333 100644
--- a/containers.opam
+++ b/containers.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "containers"
-version: "3.0"
+version: "3.0.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 synopsis: "A modular, clean and powerful extension of the OCaml standard library"