diff --git a/README.md b/README.md
index 7ddf9893..a09841a7 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,16 @@ A3. Check your uri, if you hit a pdf that is hosted on a `http` you will need to
 
 
 ### ChangeLog
+v4.0.0 (**break change**)
+1. replace dependence lib ```react-native-fetch-blob``` with ```rn-fetch-blob```
+if you upgrade from an old version, you should 
+```
+react-native unlink react-native-fetch-blob
+npm uninstall react-native-fetch-blob
+
+npm install rn-fetch-blob --save
+react-native link rn-fetch-blob
+```
 
 v3.0.17
 1. update android build tool to v26.0.3
diff --git a/package.json b/package.json
index fe3b45c1..739702b3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "react-native-pdf",
-    "version": "3.0.17",
+    "version": "4.0.0",
     "description": "A react native PDF view component",
     "main": "index.js",
     "typings": "./index.d.ts",
@@ -30,6 +30,6 @@
         "prop-types": "^15.5.10"
     },
     "peerDependencies": {
-        "rn-fetch-blob": "^0.10.11"
+        "rn-fetch-blob": "^0.10.12"
     }
 }
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