diff --git a/3rdparty b/3rdparty
index 27a56c5bb9d0e..e287243b8eeaf 160000
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit 27a56c5bb9d0ec514a8fb22044fd5f03a51ea2a5
+Subproject commit e287243b8eeaf72443b841ace3b1788e85a5aacd
diff --git a/lib/private/Files/Storage/Local.php b/lib/private/Files/Storage/Local.php
index 5d0ce596b11f7..7f4568be02b71 100644
--- a/lib/private/Files/Storage/Local.php
+++ b/lib/private/Files/Storage/Local.php
@@ -274,6 +274,8 @@ public function file_get_contents($path) {
 	}
 
 	public function file_put_contents($path, $data) {
+		// support Write-Once-Read-Many filesystems
+		$this->unlink($path);
 		return file_put_contents($this->getSourcePath($path), $data);
 	}
 
@@ -353,6 +355,10 @@ public function copy($path1, $path2) {
 	}
 
 	public function fopen($path, $mode) {
+		if ($mode === 'w') {
+			// support Write-Once-Read-Many filesystems
+			$this->unlink($path);
+		}
 		return fopen($this->getSourcePath($path), $mode);
 	}