diff --git a/History.md b/History.md
index 353dcb8..4e1d63a 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,8 @@
+13.1.3 / 2017-10-28
+===================
+
+  * Fix weird bug in `.containDeep` when given object is string (see \#157)
+
 13.1.2 / 2017-10-10
 ===================
 
diff --git a/package.json b/package.json
index a5464ad..391347d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "should",
   "description": "test framework agnostic BDD-style assertions",
-  "version": "13.1.2",
+  "version": "13.1.3",
   "author": "TJ Holowaychuk <tj@vision-media.ca>, Denis Bardadym <bardadymchik@gmail.com>",
   "typings": "./should.d.ts",
   "repository": {
@@ -16,7 +16,8 @@
     "prepare": "npm run build && npm run build:umd && npm run build:cjs:as-function",
     "pretest": "npm run build",
     "build:cjs:as-function": "rollup --input ./lib/should.js --output.format=cjs --output.file ./as-function.js",
-    "test": "mocha -R mocha-better-spec-reporter --require ./cjs/should --color --check-leaks ./test/*.test.js ./test/**/*.test.js",
+    "test":
+      "mocha -R mocha-better-spec-reporter --require ./cjs/should --color --check-leaks ./test/*.test.js ./test/**/*.test.js",
     "zuul": "zuul -- ./test/**/*.test.js ./test/*.test.js",
     "build:umd": "rollup -c rollup.config.js --input ./lib/umd.js --output.format=iife  --output.file ./should.js"
   },
@@ -33,12 +34,7 @@
     "typescript": "^2.5.3",
     "zuul": "latest"
   },
-  "keywords": [
-    "test",
-    "bdd",
-    "assert",
-    "should"
-  ],
+  "keywords": ["test", "bdd", "assert", "should"],
   "main": "./cjs/should.js",
   "module": "./es6/should.js",
   "license": "MIT",
@@ -49,13 +45,5 @@
     "should-type-adaptors": "^1.0.1",
     "should-util": "^1.0.0"
   },
-  "files": [
-    "cjs/*",
-    "es6/*",
-    "as-function.js",
-    "should.js",
-    "LICENSE",
-    "*.md",
-    "should.d.ts"
-  ]
+  "files": ["cjs/*", "es6/*", "as-function.js", "should.js", "LICENSE", "*.md", "should.d.ts"]
 }
diff --git a/should.js b/should.js
index e42809b..3ed924b 100644
--- a/should.js
+++ b/should.js
@@ -1,6 +1,6 @@
 /*!
  * should - test framework agnostic BDD-style assertions
- * @version v13.1.2
+ * @version v13.1.3
  * @author TJ Holowaychuk <tj@vision-media.ca>, Denis Bardadym <bardadymchik@gmail.com>
  * @link https://github.com/shouldjs/should.js
  * @license MIT
@@ -3428,7 +3428,7 @@ var containAssertions = function(should, Assertion) {
     this.params = { operator: "to contain " + i(other) };
 
     var obj = this.obj;
-    if (typeof obj == "string") {
+    if (typeof obj === "string" && typeof other === "string") {
       // expect other to be string
       this.is.equal(String(other));
     } else if (isIterable(obj) && isIterable(other)) {