diff --git a/CHANGES.md b/CHANGES.md
index 8d80c6c..3d5a810 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,10 @@
 Change Log
 ==========
 
+### 3.1.1 - 2021-06-22
+
+* Fixed security warnings by updating outdated npm dependencies. [#254](https://github.com/CesiumGS/obj2gltf/pull/254)
+
 ### 3.1.0 - 2020-03-13
 
 * Added back `inputUpAxis` and `outputUpAxis`. [#211](https://github.com/CesiumGS/obj2gltf/pull/211)
diff --git a/package.json b/package.json
index ead9361..b089975 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "obj2gltf",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Convert OBJ model format to glTF",
   "license": "Apache-2.0",
   "contributors": [