diff --git a/README.md b/README.md
index fae1597..973aa89 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,10 @@ This error type correctly inherits from `Error`, and can be used with `instanceo
 
 ## Changelog
 
+### 1.0.3 (August 31, 2019)
+
+- Added missing Bluebird dependency to `package.json` (as a non-development dependency).
+
 ### 1.0.2 (August 31, 2019)
 
 - DNS errors now also result in a `LookupFailed` error, like they should.
diff --git a/package.json b/package.json
index 0da0766..3b9e24e 100644
--- a/package.json
+++ b/package.json
@@ -12,11 +12,11 @@
     "axios-get-json-response": "^1.0.1",
     "create-error": "^0.3.1",
     "dotty": "^0.1.0",
-    "validatem": "^0.2.0"
+    "validatem": "^0.2.0",
+    "bluebird": "^3.5.5"
   },
   "devDependencies": {
     "@joepie91/eslint-config": "^1.1.0",
-    "bluebird": "^3.5.5",
     "eslint": "^6.2.2"
   }
 }