diff --git a/bypy/sources.json b/bypy/sources.json
index 33411d66ea..a200d55e7d 100644
--- a/bypy/sources.json
+++ b/bypy/sources.json
@@ -242,10 +242,10 @@
     },
 
     {
-        "name": "libpng 1.6.40",
+        "name": "libpng 1.6.51",
         "unix": {
             "file_extension": "tar.xz",
-            "hash": "sha256:535b479b2467ff231a3ec6d92a525906fb8ef27978be4f66dbe05d3f3a01b3a1",
+            "hash": "sha256:a050a892d3b4a7bb010c3a95c7301e49656d72a64f1fc709a90b8aded192bed2",
             "urls": ["https://downloads.sourceforge.net/sourceforge/libpng/{filename}"]
         }
     },