diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 64167db..4611fcc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -51,7 +51,8 @@ jobs:
 
         python --version
 
-        python -m pip install --upgrade pip
+        # don't upgrade PIP for now: https://github.com/pdm-project/pdm/issues/874
+        # python -m pip install --upgrade pip
 
         pip install pdm
 
diff --git a/docker/image/Dockerfile b/docker/image/Dockerfile
index 2a19ee4..1c19468 100644
--- a/docker/image/Dockerfile
+++ b/docker/image/Dockerfile
@@ -41,14 +41,18 @@ RUN apt-get update \
     binutils `# required by pyinstaller` \
     git `# required by pdm to generate app version` \
     curl xz-utils `# required to install upx` \
+ #
  # install upx
  # upx is currently not supported on Linux, see https://github.com/pyinstaller/pyinstaller/discussions/6275
  #&& mkdir /opt/upx \
  #&& upx_download_url=$(curl -fsSL https://api.github.com/repos/upx/upx/releases/latest | grep browser_download_url | grep amd64_linux.tar.xz | cut "-d\"" -f4) \
  #&& echo "Downloading [$upx_download_url]..." \
  #&& curl -fL $upx_download_url | tar Jxv -C /opt/upx --strip-components=1 \
+ #
  # upgrade pip
- && python -m pip install --upgrade pip \
+ # don't upgrade PIP for now: https://github.com/pdm-project/pdm/issues/874
+ #&& python -m pip install --upgrade pip \
+ #
  # install pdm
  && pip install pdm