diff --git a/.hgtags b/.hgtags
index ea53f68..ee9500c 100644
--- a/.hgtags
+++ b/.hgtags
@@ -22,3 +22,4 @@ a0e24af92af0a4523e5e7dd9b658f1204ce3fe2d mmsource-1.7.1
 9c2b1e877e1689ff60eb4ec9b2473823eb7397a1 mmsource-1.8.2
 96932fe375a5b1c8ff5508cf0736bf45e6045779 mmsource-1.8.3
 c28930dd4f46be2de46ce9c9e042bffac021aa84 mmsource-1.8.4
+3e48f4adf523e90148145aee903882bb825936d5 mmsource-1.8.5
diff --git a/product.version b/product.version
index 6dd95e3..9f0c663 100644
--- a/product.version
+++ b/product.version
@@ -1 +1 @@
-1.8.5-dev
+1.8.6-dev
diff --git a/support/changelog.txt b/support/changelog.txt
index e97470c..26426c4 100644
--- a/support/changelog.txt
+++ b/support/changelog.txt
@@ -1,6 +1,9 @@
-2010/10/31 1.8.4:
+2010/12/19 1.8.5:
+ - Added support for latest Orange Box engine update (bug 4752).
+
+2010/10/30 1.8.4:
  - Added support for Alien Swarm (bug 4529).
- - Added support for L4D and L4D2 on Mac OS X (bug 4680 and bug 4646).
+ - Added support for L4D and L4D2 on Mac OS X (bug 4683 and bug 4646).
  - Updated support for L4D (bug 4680).
  - Fixed bug on OB listen servers where the engine was being detected as OBV
    (bug 4560).