diff --git a/changelog.txt b/changelog.txt
index 388fca3d..0bcd07f6 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,7 +1,7 @@
 OPENSEADRAGON CHANGELOG
 =======================
 
-3.2.0: (in progress...)
+4.0.0:
 
 * NEW BEHAVIOR: Setting the viewport rotation now animates by default (pass false for the new `immediately` parameter to disable) (#2136 @jonasengelmann)
 * NEW BEHAVIOR: The auto resize now takes both width and height into account when scaling the contents proportionally to the viewer (#2256 @pearcetm)
diff --git a/package.json b/package.json
index 05458ac3..87cbf254 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "openseadragon",
-    "version": "3.1.0",
+    "version": "4.0.0",
     "description": "Provides a smooth, zoomable user interface for HTML/Javascript.",
     "keywords": [
         "image",
@@ -47,4 +47,4 @@
         "test": "grunt test",
         "prepare": "grunt build"
     }
-}
+}
\ No newline at end of file