diff --git a/copyparty/__version__.py b/copyparty/__version__.py
index 8b5a2803..187d01d4 100644
--- a/copyparty/__version__.py
+++ b/copyparty/__version__.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 
-VERSION = (1, 4, 4)
+VERSION = (1, 4, 5)
 CODENAME = "mostly reliable"
 BUILD_DT = (2022, 10, 9)
 
diff --git a/copyparty/th_srv.py b/copyparty/th_srv.py
index b82fa838..ae045bc0 100644
--- a/copyparty/th_srv.py
+++ b/copyparty/th_srv.py
@@ -621,7 +621,7 @@ class ThumbSrv(object):
 
     def _clean(self, cat: str, thumbpath: str) -> int:
         # self.log("cln {}".format(thumbpath))
-        exts = ["jpg", "webp"] if cat == "th" else ["opus", "caf"]
+        exts = ["jpg", "webp", "png"] if cat == "th" else ["opus", "caf"]
         maxage = getattr(self.args, cat + "_maxage")
         now = time.time()
         prev_b64 = None