diff --git a/contrib/libtests/pngunknown.c b/contrib/libtests/pngunknown.c
index ecf8f33bb..89077e4b1 100644
--- a/contrib/libtests/pngunknown.c
+++ b/contrib/libtests/pngunknown.c
@@ -1,8 +1,8 @@
 
 /* pngunknown.c - test the read side unknown chunk handling
  *
- * Last changed in libpng 1.6.10 [March 6, 2014]
- * Copyright (c) 2014 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.22 [(PENDING RELEASE)]
+ * Copyright (c) 2016 Glenn Randers-Pehrson
  * Written by John Cunningham Bowler
  *
  * This code is released under the libpng license.