diff --git a/CHANGELOG.md b/CHANGELOG.md
index 586a5df21..7322f4f5a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,7 +15,7 @@ Other updates:
 * Added an undocumented option to proxy websockets.
 * Internal improvements to the code to make it more reliable and readable.
 
-Version 69a released on July 21, 2024 corrects a setup failure.
+Version 69a (July 21, 2024) and 69b (July 23, 2024) correct setup failures.
 
 Version 68 (April 1, 2024)
 --------------------------
diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index b7aac0a55..93c72f06e 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -25,7 +25,7 @@ if [ -z "$TAG" ]; then
 	if [ "$UBUNTU_VERSION" == "Ubuntu 22.04 LTS" ]; then
 		# This machine is running Ubuntu 22.04, which is supported by
 		# Mail-in-a-Box versions 60 and later.
-		TAG=v69a
+		TAG=v69b
 	elif [ "$UBUNTU_VERSION" == "Ubuntu 18.04 LTS" ]; then
 		# This machine is running Ubuntu 18.04, which is supported by
 		# Mail-in-a-Box versions 0.40 through 5x.
diff --git a/setup/management.sh b/setup/management.sh
index 7fd844ea7..fb359cd3b 100755
--- a/setup/management.sh
+++ b/setup/management.sh
@@ -54,7 +54,7 @@ hide_output $venv/bin/pip install --upgrade \
 # Create a backup directory and a random key for encrypting backups.
 mkdir -p "$STORAGE_ROOT/backup"
 if [ ! -f "$STORAGE_ROOT/backup/secret_key.txt" ]; then
-	umask 077; openssl rand -base64 2048 > "$STORAGE_ROOT/backup/secret_key.txt"
+	(umask 077; openssl rand -base64 2048 > "$STORAGE_ROOT/backup/secret_key.txt")
 fi