diff --git a/packages.txt b/packages.txt
index 6752a3a..7a76631 100644
--- a/packages.txt
+++ b/packages.txt
@@ -347,6 +347,7 @@ dotnet5.0-build-reference-packages
 dotnet6.0
 dotnet7.0
 dotnet8.0
+dotnet9.0
 double-conversion
 dovecot
 doxygen