diff --git a/tests/script/bootstrap/common.sh b/tests/script/bootstrap/common.sh
index c3cd90e..abfef88 100644
--- a/tests/script/bootstrap/common.sh
+++ b/tests/script/bootstrap/common.sh
@@ -184,7 +184,7 @@ if [ -z $COMMON_SOURCED ]; then
         PIP_SUDO_CMD=$SUDO_CMD
     fi
 
-    $PIP_SUDO_CMD pip install --src dependencies --pre -Ur $BOOTSTRAP_DIR/pip-requirements.txt
+    $PIP_SUDO_CMD pip install --ignore-installed --src dependencies --pre -Ur $BOOTSTRAP_DIR/pip-requirements.txt
 
     COMMON_SOURCED=1
 fi