diff --git a/.github/workflows/wheels-dependencies.sh b/.github/workflows/wheels-dependencies.sh
index bbc52352c18..32492d20ff7 100755
--- a/.github/workflows/wheels-dependencies.sh
+++ b/.github/workflows/wheels-dependencies.sh
@@ -104,7 +104,7 @@ LIBWEBP_VERSION=1.6.0
 BZIP2_VERSION=1.0.8
 LIBXCB_VERSION=1.17.0
 BROTLI_VERSION=1.2.0
-LIBAVIF_VERSION=1.3.0
+LIBAVIF_VERSION=1.4.0
 
 function build_pkg_config {
     if [ -e pkg-config-stamp ]; then return; fi
diff --git a/Tests/test_file_avif.py b/Tests/test_file_avif.py
index ffc4ce0210d..a25f7717797 100644
--- a/Tests/test_file_avif.py
+++ b/Tests/test_file_avif.py
@@ -145,14 +145,14 @@ def test_write_rgb(self, tmp_path: Path) -> None:
 
             # avifdec hopper.avif avif/hopper_avif_write.png
             assert_image_similar_tofile(
-                reloaded, "Tests/images/avif/hopper_avif_write.png", 6.02
+                reloaded, "Tests/images/avif/hopper_avif_write.png", 6.88
             )
 
             # This test asserts that the images are similar. If the average pixel
             # difference between the two images is less than the epsilon value,
             # then we're going to accept that it's a reasonable lossy version of
             # the image.
-            assert_image_similar(reloaded, im, 8.62)
+            assert_image_similar(reloaded, im, 9.28)
 
     def test_AvifEncoder_with_invalid_args(self) -> None:
         """
@@ -461,12 +461,9 @@ def test_decoder_codec_cannot_encode(self, tmp_path: Path) -> None:
     @pytest.mark.parametrize(
         "advanced",
         [
-            {
-                "aq-mode": "1",
-                "enable-chroma-deltaq": "1",
-            },
-            (("aq-mode", "1"), ("enable-chroma-deltaq", "1")),
-            [("aq-mode", "1"), ("enable-chroma-deltaq", "1")],
+            {"tune": "psnr"},
+            (("tune", "psnr"),),
+            [("tune", "psnr")],
         ],
     )
     def test_encoder_advanced_codec_options(
diff --git a/depends/install_libavif.sh b/depends/install_libavif.sh
index 0089bf2b5fd..5c5c6f3f7c2 100755
--- a/depends/install_libavif.sh
+++ b/depends/install_libavif.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
-version=1.3.0
+version=1.4.0
 
 if [[ "$GHA_LIBAVIF_CACHE_HIT" == "true" ]]; then
 
@@ -17,10 +17,6 @@ else
 
     pushd libavif-$version
 
-    # Apply patch for SVT-AV1 4.0 compatibility
-    # Pending release of https://github.com/AOMediaCodec/libavif/pull/2971
-    patch -p1 < ../libavif-svt4.patch
-
     if [ $(uname) == "Darwin" ] && [ -x "$(command -v brew)" ]; then
         PREFIX=$(brew --prefix)
     else
diff --git a/depends/libavif-svt4.patch b/depends/libavif-svt4.patch
deleted file mode 100644
index 7abfc529970..00000000000
--- a/depends/libavif-svt4.patch
+++ /dev/null
@@ -1,14 +0,0 @@
---- a/src/codec_svt.c
-+++ b/src/codec_svt.c
-@@ -162,7 +162,11 @@ static avifResult svtCodecEncodeImage(avifEncoder * encoder,
- #else
-         svt_config->logical_processors = encoder->maxThreads;
- #endif
-+#if SVT_AV1_CHECK_VERSION(4, 0, 0)
-+        svt_config->aq_mode = 2;
-+#else
-         svt_config->enable_adaptive_quantization = 2;
-+#endif
-         // disable 2-pass
- #if SVT_AV1_CHECK_VERSION(0, 9, 0)
-         svt_config->rc_stats_buffer = (SvtAv1FixedBuf) { NULL, 0 };
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 34f3065484c..f240cb02ad8 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -119,7 +119,7 @@ def cmd_msbuild(
     "HARFBUZZ": "12.3.2",
     "JPEGTURBO": "3.1.3",
     "LCMS2": "2.18",
-    "LIBAVIF": "1.3.0",
+    "LIBAVIF": "1.4.0",
     "LIBIMAGEQUANT": "4.4.1",
     "LIBPNG": "1.6.55",
     "LIBWEBP": "1.6.0",