diff --git a/changelogs/3.9.md b/changelogs/3.9.md
index 4fa55b5b8..1f8f68545 100644
--- a/changelogs/3.9.md
+++ b/changelogs/3.9.md
@@ -37,3 +37,10 @@ Plugin developers should **only** update their required API to this version if y
   - `RemoveEntityPacket` (not to be confused with the old one)
   - `StructureTemplateDataExportRequestPacket`
   - `StructureTemplateDataExportResponsePacket`
+
+# 3.9.1
+- Fixed resource packs not working on 1.12 clients.
+- Fixed some particles displaying incorrectly (some still don't render at all).
+- Fixed `Entity->setFireTicks()` with a value of `0` setting the on-fire flag.
+- Silenced a debug message which appeared every time a player right-clicked a block.
+- Updated constants for `LevelSoundEventPacket`.
diff --git a/src/pocketmine/VersionInfo.php b/src/pocketmine/VersionInfo.php
index 1c4a26100..a912acab8 100644
--- a/src/pocketmine/VersionInfo.php
+++ b/src/pocketmine/VersionInfo.php
@@ -23,5 +23,5 @@ namespace pocketmine;
 
 const NAME = "PocketMine-MP";
 const BASE_VERSION = "3.9.1";
-const IS_DEVELOPMENT_BUILD = true;
+const IS_DEVELOPMENT_BUILD = false;
 const BUILD_NUMBER = 0;