diff --git a/Tools/environment_install/install-prereqs-ubuntu.sh b/Tools/environment_install/install-prereqs-ubuntu.sh
index 16332a6e7a..7f5c075a82 100755
--- a/Tools/environment_install/install-prereqs-ubuntu.sh
+++ b/Tools/environment_install/install-prereqs-ubuntu.sh
@@ -164,7 +164,7 @@ fi
 # Lists of packages to install
 BASE_PKGS="build-essential ccache g++ gawk git make wget valgrind screen python3-pexpect"
 PYTHON_PKGS="future lxml pymavlink pyserial MAVProxy geocoder empy==3.3.4 ptyprocess dronecan"
-PYTHON_PKGS="$PYTHON_PKGS flake8 junitparser"
+PYTHON_PKGS="$PYTHON_PKGS flake8 junitparser wsproto"
 
 # add some Python packages required for commonly-used MAVProxy modules and hex file generation:
 if [[ $SKIP_AP_EXT_ENV -ne 1 ]]; then