diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56159450..e7fa49e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,13 @@ Web:
 * The default web page served on fresh installations now adds the `noindex` meta tag.
 * The HSTS header is revised to also be sent on non-success responses.
 
+v0.48 (August 26, 2020)
+-----------------------
+
+Security fixes:
+
+* Roundcube is updated to version 1.4.8 fixing additional cross-site scripting (XSS) vulnerabilities.
+
 v0.47 (July 29, 2020)
 ---------------------
 
diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 7cc02d43..7f4364a9 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -20,7 +20,7 @@ if [ -z "$TAG" ]; then
 	# want to display in status checks.
 	if [ "`lsb_release -d | sed 's/.*:\s*//' | sed 's/18\.04\.[0-9]/18.04/' `" == "Ubuntu 18.04 LTS" ]; then
 		# This machine is running Ubuntu 18.04.
-		TAG=v0.47
+		TAG=v0.48
 
 	elif [ "`lsb_release -d | sed 's/.*:\s*//' | sed 's/14\.04\.[0-9]/14.04/' `" == "Ubuntu 14.04 LTS" ]; then
 		# This machine is running Ubuntu 14.04.
diff --git a/setup/webmail.sh b/setup/webmail.sh
index 71d4a858..7e28a894 100755
--- a/setup/webmail.sh
+++ b/setup/webmail.sh
@@ -29,8 +29,8 @@ apt_install \
 # Install Roundcube from source if it is not already present or if it is out of date.
 # Combine the Roundcube version number with the commit hash of plugins to track
 # whether we have the latest version of everything.
-VERSION=1.4.7
-HASH=49F194D25AC7B9BF175BD52285BB61CDE7BAED44
+VERSION=1.4.8
+HASH=3a6824fd68fef2e0d24f186cfbee5c6f9d6edbe9
 PERSISTENT_LOGIN_VERSION=6b3fc450cae23ccb2f393d0ef67aa319e877e435
 HTML5_NOTIFIER_VERSION=4b370e3cd60dabd2f428a26f45b677ad1b7118d5
 CARDDAV_VERSION=3.0.3