diff --git a/.ci/build-wheels.sh b/.ci/build-wheels.sh
index fef148c..e999bc9 100755
--- a/.ci/build-wheels.sh
+++ b/.ci/build-wheels.sh
@@ -84,7 +84,11 @@ make install
 cd ~/ffmpeg_sources
 curl -sLO "https://bitbucket.org/multicoreware/x265_git/downloads/x265_$X265_VERSION.tar.gz"
 tar xzf "x265_$X265_VERSION.tar.gz"
-cd x265_*/build/linux
+cd x265_*/
+# Backport patches to fix build on cmake >4.0.0
+patch -p1 < /io/.ci/x265_b354c009a60bcd6d7fc04014e200a1ee9c45c167.patch
+patch -p1 < /io/.ci/x265_51ae8e922bcc4586ad4710812072289af91492a8.patch
+cd build/linux
 cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$BUILD_DIR" -DENABLE_SHARED:bool=on ../../source
 make
 make install
diff --git a/.ci/build_wheels_osx.sh b/.ci/build_wheels_osx.sh
index 7002f7a..83bd15e 100644
--- a/.ci/build_wheels_osx.sh
+++ b/.ci/build_wheels_osx.sh
@@ -82,7 +82,7 @@ tar xzf "v$BROTLI_VERSION.tar.gz"
 cd "brotli-$BROTLI_VERSION"
 mkdir out
 cd out
-cmake -DCMAKE_INSTALL_PREFIX="$BUILD_PATH" -DCMAKE_OSX_ARCHITECTURES="$ARCH" -DCMAKE_BUILD_TYPE=Release ..
+cmake -DCMAKE_INSTALL_PREFIX="$BUILD_PATH" -DCMAKE_OSX_ARCHITECTURES="$ARCH" -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 ..
 cmake --build . --config Release --target install
 
 
@@ -197,6 +197,9 @@ make install
 cd "$SRC_PATH"
 git clone https://bitbucket.org/multicoreware/x265_git.git --depth 1 --branch "Release_$X265_VERSION"
 cd x265_git
+# Backport patches to fix build on cmake >4.0.0
+patch -p1 < "$base_dir/.ci/x265_b354c009a60bcd6d7fc04014e200a1ee9c45c167.patch"
+patch -p1 < "$base_dir/.ci/x265_51ae8e922bcc4586ad4710812072289af91492a8.patch"
 if [ "$ARCH" = "arm64" ]; then
   patch -p1 < "$base_dir/.ci/apple_arm64_x265.patch"
   cd source
@@ -257,11 +260,8 @@ tar xzvf "libtheora-$LIBTHEORA_VERSION.tar.gz"
 cd "libtheora-$LIBTHEORA_VERSION"
 # https://bugs.gentoo.org/465450
 sed -i "" 's/png_\(sizeof\)/\1/g' examples/png2theora.c
-THEORA_ARCH=$ARCH
-if [ "$ARCH" = "arm64" ]; then
-  THEORA_ARCH=arm
-fi
-./configure --prefix="$BUILD_PATH" --enable-shared --host=$THEORA_ARCH-darwin
+THEORA_ARCH=$ARCH2
+./configure --prefix="$BUILD_PATH" --enable-shared --host=$THEORA_ARCH-apple-darwin
 make
 make install
 
diff --git a/.ci/dep_versions.sh b/.ci/dep_versions.sh
index 9c281b0..e7cb613 100644
--- a/.ci/dep_versions.sh
+++ b/.ci/dep_versions.sh
@@ -13,7 +13,7 @@ export X265_VERSION=3.5  # https://bitbucket.org/multicoreware/x265_git/download
 export FDK_VERSION=2.0.2  # https://github.com/mstorsjo/fdk-aac
 export OPUS_VERSION=1.3.1  # https://archive.mozilla.org/pub/opus/
 export LIBOGG_VERSION=1.3.5  # http://downloads.xiph.org/releases/ogg/
-export LIBTHEORA_VERSION=1.1.1  # https://ftp.osuosl.org/pub/xiph/releases/theora/
+export LIBTHEORA_VERSION=1.2.0  # https://ftp.osuosl.org/pub/xiph/releases/theora/
 export LIBVORBIS_VERSION=1.3.7  # http://downloads.xiph.org/releases/vorbis
 export LIBVPX_VERSION=1.14.1  # https://chromium.googlesource.com/webm/libvpx
 export XZ_VERSION=5.4.1  # https://tukaani.org/xz/
diff --git a/.ci/x265_51ae8e922bcc4586ad4710812072289af91492a8.patch b/.ci/x265_51ae8e922bcc4586ad4710812072289af91492a8.patch
new file mode 100644
index 0000000..8d21b0a
--- /dev/null
+++ b/.ci/x265_51ae8e922bcc4586ad4710812072289af91492a8.patch
@@ -0,0 +1,57 @@
+From 51ae8e922bcc4586ad4710812072289af91492a8 Mon Sep 17 00:00:00 2001
+From: yaswanthsastry <yaswanth.sastry@multicorewareinc.com>
+Date: Mon, 7 Apr 2025 11:27:36 +0530
+Subject: [PATCH] Fix for CMake Build Errors in MacOS
+
+---
+ source/CMakeLists.txt | 15 +++++++--------
+ 1 file changed, 7 insertions(+), 8 deletions(-)
+
+diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
+index 4f5b3ed82..7183fd3ce 100755
+--- a/source/CMakeLists.txt
++++ b/source/CMakeLists.txt
+@@ -6,18 +6,14 @@ if(NOT CMAKE_BUILD_TYPE)
+         FORCE)
+ endif()
+ message(STATUS "cmake version ${CMAKE_VERSION}")
+-if(POLICY CMP0025)
+-    cmake_policy(SET CMP0025 NEW) # report Apple's Clang as just Clang
+-endif()
++
+ if(POLICY CMP0042)
+     cmake_policy(SET CMP0042 NEW) # MACOSX_RPATH
+ endif()
+-if(POLICY CMP0054)
+-    cmake_policy(SET CMP0054 NEW) # Only interpret if() arguments as variables or keywords when unquoted
+-endif()
++
+ 
+ project (x265)
+-cmake_minimum_required (VERSION 2.8.8) # OBJECT libraries require 2.8.8
++cmake_minimum_required (VERSION 2.8.8...3.10) # OBJECT libraries require 2.8.8
+ include(CheckIncludeFiles)
+ include(CheckFunctionExists)
+ include(CheckSymbolExists)
+@@ -168,7 +164,7 @@ if(APPLE)
+   add_definitions(-DMACOS=1)
+ endif()
+ 
+-if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
++if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang")
+     set(CLANG 1)
+ endif()
+ if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
+@@ -740,6 +736,9 @@ if((MSVC_IDE OR XCODE OR GCC) AND ENABLE_ASSEMBLY)
+     if(ARM OR CROSS_COMPILE_ARM)
+     # compile ARM arch asm files here
+         enable_language(ASM)
++        if(APPLE)
++            set(ARM_ARGS ${ARM_ARGS} -arch ${CMAKE_OSX_ARCHITECTURES})
++        endif()
+         foreach(ASM ${ARM_ASMS})
+ 			set(ASM_SRC ${CMAKE_CURRENT_SOURCE_DIR}/common/arm/${ASM})
+             list(APPEND ASM_SRCS ${ASM_SRC})
+-- 
+2.49.0
+
diff --git a/.ci/x265_b354c009a60bcd6d7fc04014e200a1ee9c45c167.patch b/.ci/x265_b354c009a60bcd6d7fc04014e200a1ee9c45c167.patch
new file mode 100644
index 0000000..a46fe97
--- /dev/null
+++ b/.ci/x265_b354c009a60bcd6d7fc04014e200a1ee9c45c167.patch
@@ -0,0 +1,32 @@
+From b354c009a60bcd6d7fc04014e200a1ee9c45c167 Mon Sep 17 00:00:00 2001
+From: yaswanthsastry <yaswanth.sastry@multicorewareinc.com>
+Date: Mon, 24 Feb 2025 17:07:03 +0530
+Subject: [PATCH] Fix CMake build error with latest CMake 4.0 release
+
+---
+ source/CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
+index 37dbe1a87..4f5b3ed82 100755
+--- a/source/CMakeLists.txt
++++ b/source/CMakeLists.txt
+@@ -7,13 +7,13 @@ if(NOT CMAKE_BUILD_TYPE)
+ endif()
+ message(STATUS "cmake version ${CMAKE_VERSION}")
+ if(POLICY CMP0025)
+-    cmake_policy(SET CMP0025 OLD) # report Apple's Clang as just Clang
++    cmake_policy(SET CMP0025 NEW) # report Apple's Clang as just Clang
+ endif()
+ if(POLICY CMP0042)
+     cmake_policy(SET CMP0042 NEW) # MACOSX_RPATH
+ endif()
+ if(POLICY CMP0054)
+-    cmake_policy(SET CMP0054 OLD) # Only interpret if() arguments as variables or keywords when unquoted
++    cmake_policy(SET CMP0054 NEW) # Only interpret if() arguments as variables or keywords when unquoted
+ endif()
+ 
+ project (x265)
+-- 
+2.49.0
+
diff --git a/.ci/yum_deps.sh b/.ci/yum_deps.sh
index e0e5673..788d833 100644
--- a/.ci/yum_deps.sh
+++ b/.ci/yum_deps.sh
@@ -8,4 +8,4 @@ pkgconfig zlib-devel enca-devel fontconfig-devel openssl openssl-devel wget open
 libpng libpng-devel libtiff libtiff-devel libwebp libwebp-devel dbus-devel dbus ibus-devel ibus libsamplerate-devel \
 libsamplerate libmodplug-devel libmodplug flac-devel flac \
 libjpeg-turbo-devel libjpeg-turbo pulseaudio pulseaudio-libs-devel alsa-lib alsa-lib-devel ca-certificates perl-devel \
-perl perl-IPC-Cmd
+perl perl-IPC-Cmd patch
diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index 2183640..e9b659b 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -121,7 +121,12 @@ jobs:
         }
 
   linux_test_src:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
+    runs-on: ${{ matrix.os }}
     needs: windows_wheels_tests
     steps:
       - uses: actions/checkout@v4.2.2
@@ -156,7 +161,12 @@ jobs:
           pytest "$name/tests"
 
   linux_test_wheel:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+          - os: ubuntu-24.04-arm
+    runs-on: ${{ matrix.os }}
     needs: linux_wheels
     steps:
       - uses: actions/checkout@v4.2.2
@@ -194,21 +204,22 @@ jobs:
       CIBW_BEFORE_ALL_LINUX: >
         cp -r `pwd`/ffmpeg_build $HOME/ffmpeg_build &&
         source .ci/yum_deps.sh
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest ]
-        cibw_archs: [ x86_64 ]
-        cibw_build: [ 'cp39-manylinux_x86_64 cp310-manylinux_x86_64 cp311-manylinux_x86_64 cp312-manylinux_x86_64 cp313-manylinux_x86_64' ]
+        include:
+          - os: ubuntu-latest
+            cibw_archs: 'x86_64'
+            cibw_build: 'cp39-manylinux_x86_64 cp310-manylinux_x86_64 cp311-manylinux_x86_64 cp312-manylinux_x86_64 cp313-manylinux_x86_64'
+          - os: ubuntu-24.04-arm
+            cibw_archs: 'aarch64'
+            cibw_build: 'cp39-manylinux_aarch64 cp310-manylinux_aarch64 cp311-manylinux_aarch64 cp312-manylinux_aarch64 cp313-manylinux_aarch64'
     steps:
       - uses: actions/checkout@v4.2.2
       - name: Set up Python 3.x
         uses: actions/setup-python@v5.4.0
         with:
           python-version: 3.x
-      - name: Set up QEMU
-        if: ${{ matrix.cibw_archs == 'aarch64' }}
-        uses: docker/setup-qemu-action@v3.6.0
       - uses: actions/cache@v4.2.3
         id: deps-cache
         with:
@@ -221,7 +232,7 @@ jobs:
           docker run --rm -v `pwd`:/io:rw quay.io/pypa/manylinux2014_${{ matrix.cibw_archs }} /io/.ci/build-wheels.sh
       - name: Install cibuildwheel
         run: |
-          python -m pip install cibuildwheel~=2.20.0
+          python -m pip install cibuildwheel~=2.23.3
       - name: Make wheels
         run: |
           python -m cibuildwheel --output-dir dist
@@ -279,7 +290,7 @@ jobs:
 
       - name: Install cibuildwheel
         run: |
-          python -m pip install cibuildwheel~=2.20.0
+          python -m pip install cibuildwheel~=2.23.3
       - name: Build wheels
         run: |
           export REPAIR_LIBRARY_PATH="$HOME/${{ env.FFMPEG_BUILD_PATH }}_${{ matrix.arch }}/lib"