diff --git a/ubuntu-20.04-focal-amd64/Dockerfile b/ubuntu-20.04-focal-amd64/Dockerfile
index 93ee41e1..a6aefee4 100644
--- a/ubuntu-20.04-focal-amd64/Dockerfile
+++ b/ubuntu-20.04-focal-amd64/Dockerfile
@@ -4,6 +4,7 @@ RUN apt-get -qq update && DEBIAN_FRONTEND=noninteractive apt-get -y install \
     cmake \
     ghostscript \
     git \
+    libegl-dev \
     libffi-dev \
     libfreetype6-dev \
     libfribidi-dev \
@@ -11,9 +12,15 @@ RUN apt-get -qq update && DEBIAN_FRONTEND=noninteractive apt-get -y install \
     libjpeg-turbo-progs \
     libjpeg8-dev \
     liblcms2-dev \
+    libopengl-dev \
     libopenjp2-7-dev \
     libtiff5-dev \
     libwebp-dev \
+    libxcb-icccm4 \
+    libxcb-image0 \
+    libxcb-keysyms1 \
+    libxcb-render-util0 \
+    libxkbcommon-x11-0 \
     netpbm \
     python3-dev \
     python3-numpy \
@@ -36,7 +43,7 @@ RUN useradd pillow \
 
 RUN virtualenv -p /usr/bin/python3.8 --system-site-packages /vpy3 \
     && /vpy3/bin/pip install --no-cache-dir --upgrade pip \
-    && /vpy3/bin/pip install --no-cache-dir cffi olefile pytest pytest-cov \
+    && /vpy3/bin/pip install --no-cache-dir cffi olefile pyside6 pytest pytest-cov \
     && chown -R pillow:pillow /vpy3
 
 ADD depends /depends