diff --git a/CHANGELOG.md b/CHANGELOG.md
index 635f431..43e4bd8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@
 **Note**: Gaps between patch versions are faulty/broken releases. **Note**: A feature tagged as Experimental is in a
 high state of flux, you're at risk of it changing without notice.
 
+# 0.5.11
+
+- **New Feature**
+  - add `BigIntFromString` codec, #141 (@EricCrosson)
+
 # 0.5.10
 
 - **Polish**
diff --git a/package.json b/package.json
index 19978fa..e4b4d9c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "io-ts-types",
-  "version": "0.5.10",
+  "version": "0.5.11",
   "description": "A collection of codecs and combinators for use with io-ts",
   "main": "lib/index.js",
   "module": "es6/index.js",