diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9d235c..2d9cab5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,11 @@
 You may also find the [Update Guide](UPDATING.md) useful.
 
 
-## [0.5.1] - Unreleased
+## [0.5.1] - 2018-06-08
+
+### New distributions
+- Added Cauchy distribution. (#474, #486)
+- Added Pareto distribution. (#495)
 
 ### Platform support and `OsRng`
 - Remove blanket Unix implementation. (#484)
diff --git a/Cargo.toml b/Cargo.toml
index 6335de4..e1b7b78 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rand"
-version = "0.5.0" # NB: When modifying, also modify html_root_url in lib.rs
+version = "0.5.1" # NB: When modifying, also modify html_root_url in lib.rs
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"
diff --git a/rand_core/CHANGELOG.md b/rand_core/CHANGELOG.md
index bb54ceb..5885e17 100644
--- a/rand_core/CHANGELOG.md
+++ b/rand_core/CHANGELOG.md
@@ -4,6 +4,8 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.2.1] - 2018-06-08
+- References to a `CryptoRng` now also implement `CryptoRng`. (#470)
 
 ## [0.2.0] - 2018-05-21
 - Enable the `std` feature by default. (#409)
diff --git a/rand_core/Cargo.toml b/rand_core/Cargo.toml
index 0f07306..a6acfc3 100644
--- a/rand_core/Cargo.toml
+++ b/rand_core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rand_core"
-version = "0.2.0" # NB: When modifying, also modify html_root_url in lib.rs
+version = "0.2.1" # NB: When modifying, also modify html_root_url in lib.rs
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"
diff --git a/rand_core/src/lib.rs b/rand_core/src/lib.rs
index 957f98a..1b9c24c 100644
--- a/rand_core/src/lib.rs
+++ b/rand_core/src/lib.rs
@@ -35,7 +35,7 @@
 
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
        html_favicon_url = "https://www.rust-lang.org/favicon.ico",
-       html_root_url = "https://docs.rs/rand_core/0.2.0")]
+       html_root_url = "https://docs.rs/rand_core/0.2.1")]
 
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
diff --git a/src/lib.rs b/src/lib.rs
index eb23f86..03d505f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -223,7 +223,7 @@
 
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
        html_favicon_url = "https://www.rust-lang.org/favicon.ico",
-       html_root_url = "https://docs.rs/rand/0.5.0")]
+       html_root_url = "https://docs.rs/rand/0.5.1")]
 
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]