diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e72ee7..aaa1ebc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,10 +2,13 @@ CHANGELOG
 =========
 
 ## HEAD (Unreleased)
-* Fix typing for `#ap`
+_(none)_
 
 ---
 
+## 3.1.1 (2022-02-27)
+* Fix typing for `#ap`
+
 ## 3.1.0 (2022-02-27)
 
 * Added `#ap` and `#switchMap` methods.
diff --git a/package-lock.json b/package-lock.json
index 5c5ac8e..72a6736 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "randomator",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index ded04f1..867e46b 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "randomator",
   "private": false,
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "composable random generators",
   "main": "build/main/index.js",
   "types": "build/main/index.d.ts",