diff --git a/templates/update_r_packages.sh.j2 b/templates/update_r_packages.sh.j2
index f0d2edb..2d4a013 100644
--- a/templates/update_r_packages.sh.j2
+++ b/templates/update_r_packages.sh.j2
@@ -282,10 +282,10 @@ function r_github_pkgs() {
         for l in $( cat $R_PKGS_GITHUB ) ; do
             pkg=$( echo $l | cut -d "/" -f 2 )
             if [ "$ACTION" == "upgrade" ] ; then
-                Rscript $RSCRIPT_OPTIONS -e "require(devtools); require(methods); require(jsonlite) ; package_to_install <- '$l' ; refs <- jsonlite::read_json(sprintf('https://api.github.com/repos/%s/releases', package_to_install)) ; ref_to_install <- 'master'; if(length(refs)>0) { ref_to_install <- refs[[1]][['tag_name']] } ; devtools::install_github(package_to_install, ref = ref_to_install, upgrade='false')"
+                Rscript $RSCRIPT_OPTIONS -e "require(devtools); require(methods); require(jsonlite) ; package_to_install <- '$l' ; refs <- jsonlite::read_json(sprintf('https://api.github.com/repos/%s/releases', package_to_install)) ; ref_to_install <- 'master'; if(length(refs)>0) { ref_to_install <- refs[[1]][['tag_name']] } ; devtools::install_github(package_to_install, ref = ref_to_install, upgrade='never')"
 
             else
-                Rscript $RSCRIPT_OPTIONS -e "if (! ('$pkg' %in% installed.packages()[,'Package'])) { require(devtools); require(methods); require(jsonlite) ; package_to_install <- '$l' ; refs <- jsonlite::read_json(sprintf('https://api.github.com/repos/%s/releases', package_to_install)) ; ref_to_install <- 'master'; if(length(refs)>0) { ref_to_install <- refs[[1]][['tag_name']] } ; devtools::install_github(package_to_install, ref = ref_to_install, upgrade='false') }"
+                Rscript $RSCRIPT_OPTIONS -e "if (! ('$pkg' %in% installed.packages()[,'Package'])) { require(devtools); require(methods); require(jsonlite) ; package_to_install <- '$l' ; refs <- jsonlite::read_json(sprintf('https://api.github.com/repos/%s/releases', package_to_install)) ; ref_to_install <- 'master'; if(length(refs)>0) { ref_to_install <- refs[[1]][['tag_name']] } ; devtools::install_github(package_to_install, ref = ref_to_install, upgrade='never') }"
             fi
         done
     else