diff --git a/sbt b/sbt
index e0343df..b84e29d 100755
--- a/sbt
+++ b/sbt
@@ -4,8 +4,8 @@
 # Author: Paul Phillips <paulp@typesafe.com>
 
 # todo - make this dynamic
-declare -r sbt_release_version="0.13.1"
-declare -r sbt_unreleased_version="0.13.2-SNAPSHOT" # -sbt-dev doesn't work at present
+declare -r sbt_release_version="0.13.8"
+declare -r sbt_unreleased_version="0.13.8-SNAPSHOT" # -sbt-dev doesn't work at present
 declare -r buildProps="project/build.properties"
 
 declare sbt_jar sbt_dir sbt_create sbt_launch_dir
@@ -119,12 +119,12 @@ init_default_option_file () {
 
 declare -r cms_opts="-XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC"
 declare -r jit_opts="-XX:ReservedCodeCacheSize=256m -XX:+TieredCompilation"
-declare -r default_jvm_opts="-Dfile.encoding=UTF8 -XX:MaxPermSize=384m -Xms512m -Xmx1536m -Xss2m $jit_opts $cms_opts"
+declare -r default_jvm_opts="-ea -Dfile.encoding=UTF8 -Xms512m -Xmx1536m -Xss2m $jit_opts $cms_opts"
 declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
 declare -r latest_28="2.8.2"
 declare -r latest_29="2.9.3"
-declare -r latest_210="2.10.3"
-declare -r latest_211="2.11.0-M5"
+declare -r latest_210="2.10.5"
+declare -r latest_211="2.11.6"
 
 declare -r script_path="$(get_script_path "$BASH_SOURCE")"
 declare -r script_name="${script_path##*/}"