diff --git a/extra/libpng/checksums b/extra/libpng/checksums
index a7986420..11fc7845 100644
--- a/extra/libpng/checksums
+++ b/extra/libpng/checksums
@@ -1,2 +1,2 @@
-99d2b2684b045a128210230a8b5437066b68d162f38923a27a925d37ce101bd4ba
+74018331e0c60f74559e0922be0c57c955c398bd938f26eeffabae2bcb4b1f1e8c
 863a91028e401842ec2b61710246b0bd7515d5e5ea24547c25c7874b754c6ae1d7
diff --git a/extra/libpng/sources b/extra/libpng/sources
index 82e3f481..88b3a877 100644
--- a/extra/libpng/sources
+++ b/extra/libpng/sources
@@ -1,2 +1,2 @@
-https://github.com/glennrp/libpng/archive/v1.6.40.tar.gz
+https://github.com/glennrp/libpng/archive/v1.6.42.tar.gz
 patches/apng.patch
diff --git a/extra/libpng/version b/extra/libpng/version
index acb5c583..46df3579 100644
--- a/extra/libpng/version
+++ b/extra/libpng/version
@@ -1 +1 @@
-1.6.40 1
+1.6.42 1