diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9edc3f..f7a0adc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.5.1 (July 16, 2021)
+
+* Various security improvements: non-zero scalars, zeroizing on drop,
+  constant-time operations, reflected value check, and adding an
+  i2osp error condition
+
 ## 0.5.0 (March 1, 2020)
 
 * Removed dependency on generic-bytes-derive package
diff --git a/Cargo.lock b/Cargo.lock
index 02cb1a9..9ea461a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -564,7 +564,7 @@ checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
 name = "opaque-ke"
-version = "0.5.1-pre.1"
+version = "0.5.1"
 dependencies = [
  "anyhow",
  "base64",
diff --git a/Cargo.toml b/Cargo.toml
index e8d7eca..b01ca2a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "opaque-ke"
-version = "0.5.1-pre.1"
+version = "0.5.1"
 repository = "https://github.com/novifinancial/opaque-ke"
 keywords = ["cryptography", "crypto", "opaque", "passwords", "authentication"]
 description = "An implementation of the OPAQUE password-authenticated key exchange protocol"
diff --git a/README.md b/README.md
index feed3b5..36b16d8 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Installation
 Add the following line to the dependencies of your `Cargo.toml`:
 
 ```
-opaque-ke = "0.5.0"
+opaque-ke = "0.5.1"
 ```
 
 Resources