diff --git a/SPECS/libpng/libpng.signatures.json b/SPECS/libpng/libpng.signatures.json
index 7bfae386e84..3d3b9474997 100644
--- a/SPECS/libpng/libpng.signatures.json
+++ b/SPECS/libpng/libpng.signatures.json
@@ -1,5 +1,5 @@
 {
   "Signatures": {
-    "libpng-1.6.55.tar.xz": "d925722864837ad5ae2a82070d4b2e0603dc72af44bd457c3962298258b8e82d"
+    "libpng-1.6.56.tar.xz": "f7d8bf1601b7804f583a254ab343a6549ca6cf27d255c302c47af2d9d36a6f18"
   }
 }
diff --git a/SPECS/libpng/libpng.spec b/SPECS/libpng/libpng.spec
index e3c28eb9b66..2bbf3177c61 100644
--- a/SPECS/libpng/libpng.spec
+++ b/SPECS/libpng/libpng.spec
@@ -1,6 +1,6 @@
 Summary:        contains libraries for reading and writing PNG files.
 Name:           libpng
-Version:        1.6.55
+Version:        1.6.56
 Release:        1%{?dist}
 License:        zlib
 Vendor:         Microsoft Corporation
@@ -57,6 +57,9 @@ make %{?_smp_mflags} -k check
 %{_mandir}/man3/*
 
 %changelog
+* Sat Mar 28 2026 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 1.6.56-1
+- Auto-upgrade to 1.6.56 - for CVE-2026-33636, CVE-2026-33416
+
 * Wed Feb 11 2026 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 1.6.55-1
 - Auto-upgrade to 1.6.55 - for CVE-2026-25646
 
diff --git a/cgmanifest.json b/cgmanifest.json
index 3749fcf0064..8474b264527 100644
--- a/cgmanifest.json
+++ b/cgmanifest.json
@@ -10841,8 +10841,8 @@
         "type": "other",
         "other": {
           "name": "libpng",
-          "version": "1.6.55",
-          "downloadUrl": "https://downloads.sourceforge.net/libpng/libpng-1.6.55.tar.xz"
+          "version": "1.6.56",
+          "downloadUrl": "https://downloads.sourceforge.net/libpng/libpng-1.6.56.tar.xz"
         }
       }
     },