diff --git a/.gitignore b/.gitignore
index e73938c..5128e7d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
-# See https://help.github.com/ignore-files/ for more about ignoring files.
-
 # dependencies
 node_modules/
 
diff --git a/.travis.yml b/.travis.yml
index aa0ed08..861bcbb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,3 +40,7 @@ jobs:
       on:
         all_branches: true
         condition: $TRAVIS_TAG =~ ^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$
+notifications:
+  webhooks: 
+    secure: "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"
+
diff --git a/package.json b/package.json
index 2759e7f..caa4232 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "demux-postgres",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Demux-js Action Handler implementation for Postgres databases",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -28,12 +28,12 @@
   },
   "dependencies": {
     "@types/express": "^4.16.1",
-    "demux": "4.0.1-ff84e5a.0",
+    "demux": "4.0.0",
     "massive": "5.7.2",
     "pg-promise": "8.5.3"
   },
   "peerDependencies": {
-    "demux": "4.0.1-ff84e5a.0"
+    "demux": "4.0.0"
   },
   "scripts": {
     "build": "tsc && cp -R src/cyanaudit dist",
diff --git a/src/index.ts b/src/index.ts
index 6d08863..fa9b114 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,4 @@
 export { MassiveActionHandler } from './MassiveActionHandler'
 export { Migration } from './Migration'
 export { MigrationRunner } from './MigrationRunner'
+export { MigrationSequence } from './interfaces'
diff --git a/tsconfig.json b/tsconfig.json
index 3ccc22e..180e13d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,8 +2,9 @@
   "compilerOptions": {
     "target": "es6",
     "module": "commonjs",
-     "declaration": true,
+    "declaration": true,
     "outDir": "dist",
+    "sourceMap": true,
 
     "strict": true,
     "noImplicitAny": true,
diff --git a/typings.d.ts b/typings.d.ts
deleted file mode 100644
index 261d51e..0000000
--- a/typings.d.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-declare module "*.json" {
-  const value: any
-  export default value
-}
diff --git a/yarn.lock b/yarn.lock
index d83c0b0..483b78b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1051,10 +1051,10 @@ delegates@^1.0.0:
   resolved "https://registry.yarnpkg.com/delegates/-/delegates-1.0.0.tgz#84c6e159b81904fdca59a0ef44cd870d31250f9a"
   integrity sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=
 
-demux@4.0.1-ff84e5a.0:
-  version "4.0.1-ff84e5a.0"
-  resolved "https://registry.yarnpkg.com/demux/-/demux-4.0.1-ff84e5a.0.tgz#7cec648ab7800c79e8cc07626869b18f4342dda6"
-  integrity sha512-w33MpYEbsJ25Fmiu+R2RawVuoHp3nUS/XIM8IjmWmrsHuaUP+JsH7hWPLzYLUaSgeuRbsgmCwwhrFsChRa8k+A==
+demux@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/demux/-/demux-4.0.0.tgz#f0803107b3588071afeb5cc57e1cdddf354a1e80"
+  integrity sha512-wgugBOMDJciL0b2+fpy2L1ysza63Q1l72rPycc/Sdra7rXrphCTQS9M/v1e1NwMXNS60iDdp5uKEIKl/CYUcKQ==
   dependencies:
     bunyan "1.8.12"
     express "4.16.4"