diff --git a/build.sh b/build.sh
index 6acc1ec..1e1bc14 100644
--- a/build.sh
+++ b/build.sh
@@ -25,7 +25,7 @@ function build {
 
 function build_nvenc {
   git clone git://github.com/FFmpeg/nv-codec-headers.git $SRC/ffnvcodec
-  git checkout sdk/9.0
+  # git checkout sdk/9.0
   cd $SRC/ffnvcodec
   make PREFIX=$BUILD install
   add_comp nvenc
@@ -241,7 +241,7 @@ BUILD=`realpath build`
 SRC=`realpath src`
 
 git clone git://source.ffmpeg.org/ffmpeg.git $SRC/ffmpeg
-git checkout n4.3.1
+git checkout n4.2.4
 
 build_nvenc
 build_amf