diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd264718..e575533b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,11 @@ No features of Mail-in-a-Box have changed in this release, but with the newer ve
 In Development
 --------------
 
+Version 57a (June 19, 2022)
+---------------------------
+
+* The Backblaze backups fix posted in Version 57 was incomplete. It's now fixed.
+
 Version 57 (June 12, 2022)
 --------------------------
 
diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index edee7096..0e530240 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -29,7 +29,7 @@ if [ -z "$TAG" ]; then
 	elif [ "$UBUNTU_VERSION" == "Ubuntu 20.04 LTS" ]; then
 		# This machine is running Ubuntu 20.04, which is supported by
 		# Mail-in-a-Box versions 56 and later.
-		TAG=v56
+		TAG=v57a
 	elif [ "$UBUNTU_VERSION" == "Ubuntu 18.04 LTS" ]; then
 		# This machine is running Ubuntu 18.04, which is supported by
 		# Mail-in-a-Box versions 0.40 through 5x.
@@ -37,7 +37,7 @@ if [ -z "$TAG" ]; then
 		echo "Please immediately begin to migrate your information to"
 		echo "a new machine running Ubuntu 22.04. See:"
 		echo "https://mailinabox.email/maintenance.html#upgrade"
-		TAG=v56
+		TAG=v57a
 		GITSRC=miab
 	elif [ "$UBUNTU_VERSION" == "Ubuntu 14.04 LTS" ]; then
 		# This machine is running Ubuntu 14.04, which is supported by
diff --git a/setup/management.sh b/setup/management.sh
index 73fac5aa..1bec1c85 100755
--- a/setup/management.sh
+++ b/setup/management.sh
@@ -51,7 +51,8 @@ hide_output $venv/bin/pip install --upgrade \
 	rtyaml "email_validator>=1.0.0" "exclusiveprocess" \
 	flask dnspython python-dateutil expiringdict \
 	qrcode[pil] pyotp \
-	"idna>=2.0.0" "cryptography==2.2.2" boto psutil postfix-mta-sts-resolver b2sdk
+	"idna>=2.0.0" "cryptography==2.2.2" psutil postfix-mta-sts-resolver \
+	b2sdk==1.14.1 boto
 
 # CONFIGURATION