diff --git a/tools/setup_buildenv_ubuntu20.04.sh b/tools/setup_buildenv_ubuntu20.04.sh
index 3f63c5ca9..ba97b3ee5 100755
--- a/tools/setup_buildenv_ubuntu20.04.sh
+++ b/tools/setup_buildenv_ubuntu20.04.sh
@@ -42,7 +42,7 @@ if [[ $PAUSEAFTEREACHLINE == "true" ]]; then
 fi
 
 echo "=== Step $((STEP++)): Installing packages ==="
-sudo apt-get -y install build-essential cmake gcc git lib32ncurses-dev lib32z1 libfox-1.6-dev libsdl1.2-dev qt5-default qtmultimedia5-dev qttools5-dev qttools5-dev-tools qtcreator libqt5svg5-dev software-properties-common wget zip python-pip-whl python-pil libgtest-dev python3-pip python3-tk python3-setuptools clang-7 python-clang-7 libusb-1.0-0-dev stlink-tools openocd npm pv libclang-11-dev libncurses5:i386 libpython2.7:i386
+sudo apt-get -y install build-essential cmake gcc git lib32ncurses-dev lib32z1 libfox-1.6-dev libsdl1.2-dev qt5-default qtmultimedia5-dev qttools5-dev qttools5-dev-tools qtcreator libqt5svg5-dev software-properties-common wget zip python-pip-whl python-pil libgtest-dev python3-pip python3-tk python3-setuptools clang-7 python-clang-7 libusb-1.0-0-dev stlink-tools openocd npm pv libncurses5:i386 libpython2.7:i386 libclang-6.0-dev
 if [[ $PAUSEAFTEREACHLINE == "true" ]]; then
   echo "Step finished. Please check the output above and press Enter to continue or Ctrl+C to stop."
   read
@@ -56,7 +56,7 @@ if [[ $PAUSEAFTEREACHLINE == "true" ]]; then
 fi
 
 echo "=== Step $((STEP++)): Installing Python packages ==="
-sudo python3 -m pip install filelock asciitree jinja2 pillow==7.2.0 clang future lxml
+sudo python3 -m pip install filelock asciitree jinja2 pillow==7.2.0 clang==6.0.0 future lxml
 if [[ $PAUSEAFTEREACHLINE == "true" ]]; then
   echo "Step finished. Please check the output above and press Enter to continue or Ctrl+C to stop."
   read