diff --git a/script/ci/before_install.sh b/script/ci/before_install.sh
index 6b0fae571..9d8b4b0b9 100755
--- a/script/ci/before_install.sh
+++ b/script/ci/before_install.sh
@@ -1,9 +1,10 @@
 #!/bin/sh
+# install selenium prerelease
+gem install selenium-webdriver --pre
+gem list
 
 # Ensure known RubyGems version
 envdir="$(readlink -e $(dirname $0))/../env"
 . "$envdir/ruby_env"
 . "$envdir/ensure_right_rubygems"
 
-# install selenium prerelease
-gem install selenium-webdriver --pre