diff --git a/build-ffmpeg b/build-ffmpeg
index 326145f5..a93c7e55 100755
--- a/build-ffmpeg
+++ b/build-ffmpeg
@@ -4,8 +4,8 @@
 # LICENSE: https://github.com/markus-perl/ffmpeg-build-script/blob/master/LICENSE
 
 PROGNAME=$(basename "$0")
-FFMPEG_VERSION=5.0
-SCRIPT_VERSION=1.37
+FFMPEG_VERSION=5.1
+SCRIPT_VERSION=1.41
 CWD=$(pwd)
 PACKAGES="$CWD/packages"
 WORKSPACE="$CWD/workspace"
@@ -346,12 +346,12 @@ if build "nasm" "2.15.05"; then
   build_done "nasm" "2.15.05"
 fi
 
-if build "zlib" "1.2.12"; then
-  download "https://www.zlib.net/zlib-1.2.12.tar.gz"
+if build "zlib" "1.2.13"; then
+  download "https://www.zlib.net/zlib-1.2.13.tar.gz"
   execute ./configure --static --prefix="${WORKSPACE}"
   execute make -j $MJOBS
   execute make install
-  build_done "zlib" "1.2.12"
+  build_done "zlib" "1.2.13"
 fi
 
 if build "m4" "1.4.19"; then
@@ -477,7 +477,7 @@ fi
 if ! $MACOS_M1; then
   if build "svtav1" "0.9.0"; then
     # Last known working commit which passed CI Tests from HEAD branch
-    download "https://github.com/AOMediaCodec/SVT-AV1/archive/refs/tags/v0.9.0.tar.gz" "svtav1-0.9.0.tar.gz"
+    download "https://gitlab.com/AOMediaCodec/SVT-AV1/-/archive/v0.9.0/SVT-AV1-v0.9.0.tar.gz" "svtav1-0.9.0.tar.gz"
     cd "${PACKAGES}"/svtav1-0.9.0//Build/linux || exit
     execute cmake -DCMAKE_INSTALL_PREFIX="${WORKSPACE}" -DENABLE_SHARED=off -DBUILD_SHARED_LIBS=OFF ../.. -G"Unix Makefiles" -DCMAKE_BUILD_TYPE=Release
     execute make -j $MJOBS
@@ -768,11 +768,15 @@ if build "libtheora" "1.1.1"; then
   sed "s/-fforce-addr//g" configure >configure.patched
   chmod +x configure.patched
   mv configure.patched configure
-  ##BEGIN CONFIG.GUESS PATCH -- Updating config.guess file. Which allowed me to compile on aarch64 (ARMv8) [linux kernel 4.9 Ubuntu 20.04]
-  rm config.guess
-  curl -L --silent -o "config.guess" "https://raw.githubusercontent.com/gcc-mirror/gcc/master/config.guess"
-  chmod +x config.guess
-  ##END OF CONFIG.GUESS PATCH
+  
+  if ! $MACOS_M1; then
+    ##BEGIN CONFIG.GUESS PATCH -- Updating config.guess file. Which allowed me to compile on aarch64 (ARMv8) [linux kernel 4.9 Ubuntu 20.04]
+    rm config.guess
+    curl -L --silent -o "config.guess" "https://raw.githubusercontent.com/gcc-mirror/gcc/master/config.guess"
+    chmod +x config.guess
+    ##END OF CONFIG.GUESS PATCH
+  fi
+  
   execute ./configure --prefix="${WORKSPACE}" --with-ogg-libraries="${WORKSPACE}"/lib --with-ogg-includes="${WORKSPACE}"/include/ --with-vorbis-libraries="${WORKSPACE}"/lib --with-vorbis-includes="${WORKSPACE}"/include/ --enable-static --disable-shared --disable-oggtest --disable-vorbistest --disable-examples --disable-asm --disable-spec
   execute make -j $MJOBS
   execute make install