diff --git a/ci/before_install_jython.sh b/ci/before_install_jython.sh
index d1b5ff8..f6c8956 100755
--- a/ci/before_install_jython.sh
+++ b/ci/before_install_jython.sh
@@ -6,6 +6,5 @@ java -jar ${JYTHON_JAR} -s -d $HOME/jython
 
 $HOME/jython/bin/jython -m ensurepip
 
-# Install the latest virtualenv compatible with Jython
-$HOME/jython/bin/pip install virtualenv==1.9.1
+$HOME/jython/bin/pip install virtualenv
 $HOME/jython/bin/virtualenv $HOME/myvirtualenv