diff --git a/mono/latest/Dockerfile b/mono/latest/Dockerfile
index 4022fcd..8f7774a 100644
--- a/mono/latest/Dockerfile
+++ b/mono/latest/Dockerfile
@@ -10,7 +10,7 @@ RUN         sh -c 'echo "deb https://download.mono-project.com/repo/debian stabl
 RUN         wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
 RUN         dpkg -i packages-microsoft-prod.deb
 RUN         apt update
-RUN         apt install -y mono-complete dotnet-runtime-8.0
+RUN         apt install -y mono-complete dotnet-runtime-8.0 dotnet-runtime-9.0
 
 # Only install the needed steamcmd packages on the AMD64 build
 RUN         if [ "$(uname -m)" = "x86_64" ]; then \