diff --git a/.ci/get_build_matrix.sh b/.ci/get_build_matrix.sh
index def11fad01..c3410599f7 100755
--- a/.ci/get_build_matrix.sh
+++ b/.ci/get_build_matrix.sh
@@ -60,7 +60,6 @@ BUILD_ORDER=$(catkin list -u)
 
 FIRST=true
 
-# RESULT='{"matrix": ['
 RESULT='['
 
 $DEBUG && echo "Sorting packages"
@@ -106,7 +105,6 @@ for ROS_PACKAGE in $BUILD_ORDER; do
 
 done
 
-# RESULT="$RESULT]}"
 RESULT="$RESULT]"
 
 echo $RESULT
diff --git a/.ci/get_nonbloom_build_matrix.sh b/.ci/get_nonbloom_build_matrix.sh
index 3dfec9c738..e9edaffbf4 100755
--- a/.ci/get_nonbloom_build_matrix.sh
+++ b/.ci/get_nonbloom_build_matrix.sh
@@ -5,6 +5,8 @@ set -e
 trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
 trap 'echo "$0: \"${last_command}\" command failed with exit code $?, log:" && cat /tmp/log.txt' ERR
 
+sudo apt-get -y install python3 python3-yaml
+
 DEBUG=false
 
 LIST=$1