diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d71e413..ae14862 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,7 +27,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: |
-          sudo apt-get -y install libva-dev libdrm-dev libx11-dev
+          sudo apt-get -y install libx11-dev
       - uses: astral-sh/setup-uv@v4
       - run: uv python pin 3.13
       - run: uv sync
@@ -96,7 +96,7 @@ jobs:
       # libx11-dev は Ubuntu 24.04 の時に必要になる模様
       - run: |
           sudo apt-get update
-          sudo apt-get -y install libva-dev libdrm-dev libx11-dev
+          sudo apt-get -y install libx11-dev
         if: ${{ matrix.platform.os == 'ubuntu' && matrix.platform.arch == 'x86_64' }}
       - run: |
           sudo apt-get -y install multistrap binutils-aarch64-linux-gnu
diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index 7c236a4..19721e0 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -44,7 +44,7 @@ jobs:
       # libx11-dev は Ubuntu 24.04 の時に必要になる模様
       - run: |
           sudo apt-get update
-          sudo apt-get -y install libva2 libdrm2 libva-dev libdrm-dev libx11-dev portaudio19-dev
+          sudo apt-get -y install libva2 libdrm2 libx11-dev portaudio19-dev
       - name: Download openh264
         run: |
           curl -LO http://ciscobinary.openh264.org/libopenh264-${{ env.OPENH264_VERSION }}-linux64.7.so.bz2
diff --git a/CHANGES.md b/CHANGES.md
index 26f1392..eb3b100 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -74,6 +74,10 @@
   - @voluntas
 - [UPDATE] ubuntu-latest を ubuntu-24.04 に変更する
   - @voluntas
+- [CHANGE] CI の Ubuntu から libva と libdrm をインストールしないようにする
+  - @voluntas
+- [CHANGE] CMakefile の依存から libva と libdrm を削除する
+  - @voluntas
 - [CHANGE] ruff と mypy と pytest はバージョンを未指定にして、常に最新版を利用するようにする
   - @voluntas
 - [CHANGE] 利用していなかった auditwheel を削除する
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 10b45af..3c08181 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,10 +64,6 @@ find_package(nanobind CONFIG REQUIRED)
 if(NOT TARGET_OS STREQUAL "windows")
   find_package(Threads REQUIRED)
 endif()
-if(TARGET_OS STREQUAL "ubuntu" AND NOT CMAKE_CROSSCOMPILING)
-  find_package(Libva REQUIRED)
-  find_package(Libdrm REQUIRED)
-endif()
 
 
 nanobind_add_module(