diff --git a/VERSION b/VERSION
index ef8d7569d6773..d87edbfc10694 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.0
\ No newline at end of file
+4.2.1
\ No newline at end of file
diff --git a/atom/browser/resources/mac/Info.plist b/atom/browser/resources/mac/Info.plist
index 93cde44d0b9e0..25886d5d66699 100644
--- a/atom/browser/resources/mac/Info.plist
+++ b/atom/browser/resources/mac/Info.plist
@@ -17,9 +17,9 @@
   <key>CFBundleIconFile</key>
   <string>electron.icns</string>
   <key>CFBundleVersion</key>
-  <string>4.2.0</string>
+  <string>4.2.1</string>
   <key>CFBundleShortVersionString</key>
-  <string>4.2.0</string>
+  <string>4.2.1</string>
   <key>LSApplicationCategoryType</key>
   <string>public.app-category.developer-tools</string>
   <key>LSMinimumSystemVersion</key>
diff --git a/atom/browser/resources/win/atom.rc b/atom/browser/resources/win/atom.rc
index 36b015f54fffa..e48ece6e23ce7 100644
--- a/atom/browser/resources/win/atom.rc
+++ b/atom/browser/resources/win/atom.rc
@@ -50,8 +50,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 4,2,0,0
- PRODUCTVERSION 4,2,0,0
+ FILEVERSION 4,2,1,0
+ PRODUCTVERSION 4,2,1,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -68,12 +68,12 @@ BEGIN
         BEGIN
             VALUE "CompanyName", "GitHub, Inc."
             VALUE "FileDescription", "Electron"
-            VALUE "FileVersion", "4.2.0"
+            VALUE "FileVersion", "4.2.1"
             VALUE "InternalName", "electron.exe"
             VALUE "LegalCopyright", "Copyright (C) 2015 GitHub, Inc. All rights reserved."
             VALUE "OriginalFilename", "electron.exe"
             VALUE "ProductName", "Electron"
-            VALUE "ProductVersion", "4.2.0"
+            VALUE "ProductVersion", "4.2.1"
             VALUE "SquirrelAwareVersion", "1"
         END
     END
diff --git a/atom/common/atom_version.h b/atom/common/atom_version.h
index 13593040c472a..01a8fb350c511 100644
--- a/atom/common/atom_version.h
+++ b/atom/common/atom_version.h
@@ -7,7 +7,7 @@
 
 #define ATOM_MAJOR_VERSION 4
 #define ATOM_MINOR_VERSION 2
-#define ATOM_PATCH_VERSION 0
+#define ATOM_PATCH_VERSION 1
 // clang-format off
 // #define ATOM_PRE_RELEASE_VERSION
 // clang-format on
diff --git a/package-lock.json b/package-lock.json
index 6333a3bf05b90..c8bfdd4ea320c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "electron",
-  "version": "4.2.0",
+  "version": "4.2.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index f46505f87cf31..1cc773a244c7e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "electron",
-  "version": "4.2.0",
+  "version": "4.2.1",
   "repository": "https://github.com/electron/electron",
   "description": "Build cross platform desktop apps with JavaScript, HTML, and CSS",
   "devDependencies": {