diff --git a/install-php-extensions b/install-php-extensions
index 1bb2978..6280484 100755
--- a/install-php-extensions
+++ b/install-php-extensions
@@ -1385,7 +1385,12 @@ installMicrosoftSqlServerODBC() {
 		debian)
 			# https://docs.microsoft.com/en-us/sql/connect/odbc/linux-mac/installing-the-microsoft-odbc-driver-for-sql-server#debian17
 			printf -- '- installing the Microsoft APT key\n'
-			curl -sSLf https://packages.microsoft.com/keys/microsoft.asc | apt-key add -
+			if test $DISTRO_VERSION_NUMBER -ge 11; then
+				# apt-key is deprecated
+				curl -sSLf -o /etc/apt/trusted.gpg.d/microsoft.asc https://packages.microsoft.com/keys/microsoft.asc
+			else
+				curl -sSLf https://packages.microsoft.com/keys/microsoft.asc | apt-key add -
+			fi
 			if ! test -f /etc/apt/sources.list.d/mssql-release.list; then
 				printf -- '- adding the Microsoft APT source list\n'
 				curl -sSLf https://packages.microsoft.com/config/debian/$DISTRO_VERSION_NUMBER/prod.list >/etc/apt/sources.list.d/mssql-release.list