diff --git a/.github/workflows/build-linux-x86_64.yml b/.github/workflows/build-linux-x86_64.yml
index 34376fa..e23984d 100644
--- a/.github/workflows/build-linux-x86_64.yml
+++ b/.github/workflows/build-linux-x86_64.yml
@@ -42,6 +42,9 @@ jobs:
           path: ${{github.workspace}}/dep
           key: ${{ runner.os }}-dep-cef
 
+      - name: Install x11
+        run: sudo apt-get install -y libx11-dev
+
       - name: Configure CMake
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
         # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type