diff --git a/data/supported-extensions b/data/supported-extensions
index d71d1c1..d86de02 100644
--- a/data/supported-extensions
+++ b/data/supported-extensions
@@ -128,7 +128,7 @@ xdebug 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
 xdiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 xhprof 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 xlswriter 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
-xmldiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
+xmldiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 xmlrpc 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 xsl 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 yac 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
diff --git a/scripts/ci-test-extensions b/scripts/ci-test-extensions
index 2f77687..bea1a54 100755
--- a/scripts/ci-test-extensions
+++ b/scripts/ci-test-extensions
@@ -23,7 +23,7 @@ set -o nounset
 # $2: the PHP version
 shouldProcessPhpVersionForDistro() {
 	case "$2@$1" in
-		8.1@alpine3.12)
+		8.1@alpine3.12 | 8.3@buster)
 			return 1
 			;;
 		*)