diff --git a/pkg.info b/pkg.info
index 12d290f..78ec624 100644
--- a/pkg.info
+++ b/pkg.info
@@ -1,7 +1,7 @@
 name: libheif
 description: HEIF and AVIF file format decoder and encoder
 version: 1.21.2
-revision: 3
+revision: 4
 url: https://github.com/strukturag/libheif
 license: LGPL3-or-later
 maintainers:
diff --git a/source-files/svt-av1-4.0-fix.patch b/source-files/svt-av1-4.0-fix.patch
index 1b948d2..4041977 100644
--- a/source-files/svt-av1-4.0-fix.patch
+++ b/source-files/svt-av1-4.0-fix.patch
@@ -1,7 +1,7 @@
 From 61923302d12f80e2a5c945a3903d1009cf67778f Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Robert-Andr=C3=A9=20Mauchin?= <eclipseo@mauchin.fr>
 Date: Sat, 24 Jan 2026 17:30:35 +0100
-Subject: [PATCH 1/2] Set SVT-AV1's avif option for v4.0.0 or later
+Subject: [PATCH 1/3] Set SVT-AV1's avif option for v4.0.0 or later
 
 ---
  libheif/plugins/encoder_svt.cc | 7 ++++---
@@ -29,7 +29,7 @@ index 03d87ca1ae..7993e3959a 100644
 From f9919e34868920000ddba13c55e1bf3731b1e64b Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Robert-Andr=C3=A9=20Mauchin?= <eclipseo@mauchin.fr>
 Date: Sat, 24 Jan 2026 18:18:46 +0100
-Subject: [PATCH 2/2] Use PredStructure values from definitions.h instead of
+Subject: [PATCH 2/3] Use PredStructure values from definitions.h instead of
  removed SvtAv1PredStructure for v4.0.0 or later
 
 ---
@@ -79,3 +79,38 @@ index 7993e3959a..393748e997 100644
           * svt_av1_enc_get_packet() hangs on the second call. As a workaround, we can leave the
           * loop when we got the image:
           */
+
+From 9c9d839132f8846652ecadceaa8dcf23d1ff3e4c Mon Sep 17 00:00:00 2001
+From: Joachim Bauch <bauch@struktur.de>
+Date: Wed, 8 Apr 2026 10:23:34 +0200
+Subject: [PATCH 3/3] Add patch to fix building against SVT-AV1 4.1.0
+
+---
+ libheif/plugins/encoder_svt.cc | 14 +++++++++++++-
+ 1 file changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/libheif/plugins/encoder_svt.cc b/libheif/plugins/encoder_svt.cc
+index 393748e997..3e614908fe 100644
+--- a/libheif/plugins/encoder_svt.cc
++++ b/libheif/plugins/encoder_svt.cc
+@@ -838,7 +838,19 @@ static heif_error svt_start_sequence_encoding_intern(void* encoder_raw, const he
+     // svt_config.force_key_frames = true; TODO: this does not seem to work (see all [1])
+ 
+ #if 1
+-#if SVT_AV1_CHECK_VERSION(4, 0, 0)
++#if SVT_AV1_CHECK_VERSION(4, 1, 0)
++    switch (options->gop_structure) {
++      case heif_sequence_gop_structure_intra_only:
++        //svt_config.pred_structure = 1; // LOW_DELAY
++        break;
++      case heif_sequence_gop_structure_lowdelay:
++        //svt_config.pred_structure = 1; // LOW_DELAY
++        break;
++      case heif_sequence_gop_structure_unrestricted:
++        svt_config.pred_structure = PredStructure::RANDOM_ACCESS;
++        break;
++    }
++#elif SVT_AV1_CHECK_VERSION(4, 0, 0)
+     switch (options->gop_structure) {
+       case heif_sequence_gop_structure_intra_only:
+         //svt_config.pred_structure = 1; // LOW_DELAY