diff --git a/config.sh b/config.sh
index d8eb6e4cd0f..a68e41e98d6 100644
--- a/config.sh
+++ b/config.sh
@@ -6,7 +6,7 @@ ARCHIVE_SDIR=pillow-depends-main
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.0
 HARFBUZZ_VERSION=7.3.0
-LIBPNG_VERSION=1.6.39
+LIBPNG_VERSION=1.6.40
 JPEGTURBO_VERSION=2.1.5.1
 OPENJPEG_VERSION=2.5.0
 XZ_VERSION=5.4.3