diff --git a/.github/workflows/build-ffmpeg.yml b/.github/workflows/build-ffmpeg.yml
index 9d798b3f..5dae8e3f 100644
--- a/.github/workflows/build-ffmpeg.yml
+++ b/.github/workflows/build-ffmpeg.yml
@@ -63,10 +63,9 @@ jobs:
       - name: Install packages for macOS
         if: runner.os == 'macOS'
         run: |
-          brew update
           brew unlink gettext libidn2 libpng libtiff libunistring libx11 libxau libxcb libxdmcp little-cms2 unbound
           if [ "${{ matrix.os }}" = "macos-15-intel" ]; then
-            brew install yasm
+            brew install nasm
           fi
       - uses: msys2/setup-msys2@v2
         if: runner.os == 'Windows'
diff --git a/README.rst b/README.rst
index 494da375..c65abb4c 100644
--- a/README.rst
+++ b/README.rst
@@ -21,7 +21,7 @@ Currently FFmpeg 8.1 is built with the following packages enabled for all platfo
 - opus 1.6.1
 - vorbis 1.3.7
 - dav1d 1.5.3
-- libsvtav1 3.1.2
+- libsvtav1 4.0.1
 - vpx 1.16.0
 - png 1.6.54
 - webp 1.5.0
diff --git a/scripts/build-ffmpeg.py b/scripts/build-ffmpeg.py
index b7cd1efd..3a54a6b5 100644
--- a/scripts/build-ffmpeg.py
+++ b/scripts/build-ffmpeg.py
@@ -93,10 +93,10 @@ def calculate_sha256(filename: str) -> str:
     ),
     Package(
         name="libsvtav1",
-        source_url="https://gitlab.com/AOMediaCodec/SVT-AV1/-/archive/v3.1.2/SVT-AV1-v3.1.2.tar.bz2",
-        sha256="802e9bb2b14f66e8c638f54857ccb84d3536144b0ae18b9f568bbf2314d2de88",
+        source_url="https://gitlab.com/AOMediaCodec/SVT-AV1/-/archive/v4.0.1/SVT-AV1-v4.0.1.tar.bz2",
+        sha256="df2a2dd51512717e8c3637072750a3899c3a69d684accccace33c1c467f7e852",
         build_system="cmake",
-        build_arguments=["-DBUILD_APPS=OFF", "-DENABLE_NASM=ON"],
+        build_arguments=["-DBUILD_APPS=OFF", "-DBUILD_DEC=OFF", "-DBUILD_ENC=ON", "-DENABLE_NASM=ON"],
     ),
     Package(
         name="vpx",