diff --git a/engine/Makefile b/engine/Makefile
index 8b0c09d78..d143a043c 100644
--- a/engine/Makefile
+++ b/engine/Makefile
@@ -84,10 +84,10 @@ MAKE:=$(MAKE) --no-print-directory SVNREVISION="$(SVNREVISION)" SVN_VERSION="$(S
 #update these to download+build a different version. this assumes that the url+subdirs etc contain a consistant version everywhere.
 JPEGVER=9c
 ZLIBVER=1.2.13
-PNGVER=1.6.37
+PNGVER=1.6.39
 OGGVER=1.3.4
 VORBISVER=1.3.6
-SDL2VER=2.0.10
+SDL2VER=2.26.4
 SCINTILLAVER=373
 OPUSVER=1.3.1
 SPEEXVER=1.2.0