diff --git a/Makefile b/Makefile
index 74ec134..342301d 100644
--- a/Makefile
+++ b/Makefile
@@ -14,10 +14,11 @@ clean:
 
 3rdparty/onlyoffice/documentserver:
 	mkdir -p 3rdparty/onlyoffice
-	docker create --name oo-extract onlyoffice/documentserver:6.3.1.32
+	docker create --name oo-extract onlyoffice/documentserver:6.4.2.6
 	docker cp oo-extract:/var/www/onlyoffice/documentserver 3rdparty/onlyoffice
 	docker rm oo-extract
-	rm -r 3rdparty/onlyoffice/documentserver/server/{SpellChecker,Common,DocService}
+	rm -r 3rdparty/onlyoffice/documentserver/server/Common
+	rm -r 3rdparty/onlyoffice/documentserver/server/DocService
 	cd 3rdparty/onlyoffice/documentserver/server/FileConverter/bin && \
 		../../tools/allfontsgen \
 		--input="../../../core-fonts" \
diff --git a/lib/OnlyOffice/WebVersion.php b/lib/OnlyOffice/WebVersion.php
index 7a55956..b2aacc2 100644
--- a/lib/OnlyOffice/WebVersion.php
+++ b/lib/OnlyOffice/WebVersion.php
@@ -25,6 +25,6 @@
 
 class WebVersion {
 	public function getWebUIVersion(): string {
-		return '6.3.1';
+		return '6.4.2';
 	}
 }