diff --git a/CHANGELOG.md b/CHANGELOG.md
index 687660eb..3d6d6531 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.6.1
+
+- use `either` compatibility library instead of shims
+
 ## 3.6
 
 - rename `CCOpt` to `CCOption` and deprecate `CCOpt`
diff --git a/containers-data.opam b/containers-data.opam
index 7eab3a45..202f4899 100644
--- a/containers-data.opam
+++ b/containers-data.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "3.6"
+version: "3.6.1"
 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 d13c5751..d4c32535 100644
--- a/containers-thread.opam
+++ b/containers-thread.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "3.6"
+version: "3.6.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 license: "BSD-2-Clause"
diff --git a/containers.opam b/containers.opam
index 14dc7f52..582aee88 100644
--- a/containers.opam
+++ b/containers.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "containers"
-version: "3.6"
+version: "3.6.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes.2007@m4x.org"
 license: "BSD-2-Clause"