diff --git a/docker/checkout.sh b/docker/checkout.sh
index 0b3ecf9d..f5d80dd4 100755
--- a/docker/checkout.sh
+++ b/docker/checkout.sh
@@ -24,4 +24,4 @@ if [[ -n ${1} ]]; then
       dir=${1}
 fi
 
-git clone https://github.com/usdot-fhwa-stol/CARMAMsgs.git ${dir}/src/CARMAMsgs --branch CARMASystem_3.1.0 --depth 1
+git clone https://github.com/usdot-fhwa-stol/CARMAMsgs.git ${dir}/src/CARMAMsgs --branch develop --depth 1