diff --git a/Bugsnag.podspec.json b/Bugsnag.podspec.json
index 1667150b2..4bf0c967c 100644
--- a/Bugsnag.podspec.json
+++ b/Bugsnag.podspec.json
@@ -1,6 +1,6 @@
 {
   "name": "Bugsnag",
-  "version": "6.3.0",
+  "version": "6.4.0",
   "summary": "The Bugsnag crash reporting framework for Apple platforms.",
   "homepage": "https://bugsnag.com",
   "license": "MIT",
@@ -9,7 +9,7 @@
   },
   "source": {
     "git": "https://github.com/bugsnag/bugsnag-cocoa.git",
-    "tag": "v6.3.0"
+    "tag": "v6.4.0"
   },
   "frameworks": [
     "Foundation",
diff --git a/Bugsnag/Payload/BugsnagNotifier.m b/Bugsnag/Payload/BugsnagNotifier.m
index abfc3961a..1bd9bf41f 100644
--- a/Bugsnag/Payload/BugsnagNotifier.m
+++ b/Bugsnag/Payload/BugsnagNotifier.m
@@ -23,7 +23,7 @@ - (instancetype)init {
 #else
         self.name = @"Bugsnag Objective-C";
 #endif
-        self.version = @"6.3.0";
+        self.version = @"6.4.0";
         self.url = @"https://github.com/bugsnag/bugsnag-cocoa";
         self.dependencies = [NSMutableArray new];
     }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index acb1453f6..a6ad8e6e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,19 @@
 Changelog
 =========
 
+## 6.4.0 (2020-12-08)
+
+### Enhancements
+
+* Allow overriding the "unhandled" flag in error callbacks.
+  [#921](https://github.com/bugsnag/bugsnag-cocoa/pull/921)
+  [#912](https://github.com/bugsnag/bugsnag-cocoa/pull/912)
+
+### Bug fixes
+
+* Fix unexpected exception behavior when started without an API key.
+  [#931](https://github.com/bugsnag/bugsnag-cocoa/pull/931)
+
 ## 6.3.0 (2020-12-02)
 
 ### Enhancements
diff --git a/Framework/Info.plist b/Framework/Info.plist
index 26fb6024e..1b7d58dbe 100644
--- a/Framework/Info.plist
+++ b/Framework/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>6.3.0</string>
+	<string>6.4.0</string>
 	<key>CFBundleVersion</key>
 	<string>1</string>
 </dict>
diff --git a/Tests/Info.plist b/Tests/Info.plist
index 2a062aaa8..d6320c3a0 100644
--- a/Tests/Info.plist
+++ b/Tests/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>6.3.0</string>
+	<string>6.4.0</string>
 	<key>CFBundleVersion</key>
 	<string>1</string>
 </dict>
diff --git a/VERSION b/VERSION
index 798e38995..19b860c18 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.3.0
+6.4.0