diff --git a/CHANGELOG.md b/CHANGELOG.md
index cbacc29..f79c01f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [12.3.4] - 2019-04-08
 
 ### Changed
 
diff --git a/Cargo.toml b/Cargo.toml
index 7b78248..f87b49d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "im"
-version = "12.3.3"
+version = "12.3.4"
 authors = ["Bodil Stokke <bodil@bodil.org>"]
 edition = "2018"
 license = "MPL-2.0+"
diff --git a/rc/Cargo.toml b/rc/Cargo.toml
index e264d78..a327d37 100644
--- a/rc/Cargo.toml
+++ b/rc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "im-rc"
-version = "12.3.3"
+version = "12.3.4"
 edition = "2018"
 authors = ["Bodil Stokke <bodil@bodil.org>"]
 license = "MPL-2.0+"
@@ -24,7 +24,7 @@ rustc_version = "0.2"
 
 [dependencies]
 typenum = "1.10"
-sized-chunks = "0.1.1"
+sized-chunks = "0.1.2"
 quickcheck = { version = "0.8", optional = true }
 proptest = { version = "0.9", optional = true }
 serde = { version = "1.0", optional = true }