diff --git a/linux/RUBY_VERSIONS.txt b/linux/RUBY_VERSIONS.txt
index 6f71144..42178e5 100644
--- a/linux/RUBY_VERSIONS.txt
+++ b/linux/RUBY_VERSIONS.txt
@@ -1 +1 @@
-2.1.6 2.2.2 2.3.4 2.4.3 2.5.1 2.5.3 2.6.2
+2.1.6 2.2.2 2.3.4 2.4.3 2.5.1 2.5.3 2.6.4
diff --git a/linux/image/install.sh b/linux/image/install.sh
index 1b4723b..1a162dc 100755
--- a/linux/image/install.sh
+++ b/linux/image/install.sh
@@ -22,8 +22,6 @@ function create_group()
 	fi
 }
 
-set -x
-
 cd /tmp
 rpm -Uvh http://mirror.overthewire.com.au/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
 yum update -y