diff --git a/csharp/Dockerfile b/csharp/Dockerfile
index 00fb87f0bfc..7454d75be2b 100644
--- a/csharp/Dockerfile
+++ b/csharp/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0 as build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 as build
 
 WORKDIR /usr/src/app
 
@@ -10,7 +10,7 @@ RUN dotnet restore
 COPY . .
 RUN dotnet publish -c release -o out
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0
+FROM mcr.microsoft.com/dotnet/aspnet:9.0
 
 WORKDIR /usr/src/app
 
diff --git a/fsharp/Dockerfile b/fsharp/Dockerfile
index 2805ee8fc86..2cfa89c0442 100644
--- a/fsharp/Dockerfile
+++ b/fsharp/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0-bookworm-slim AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim AS build
 
 WORKDIR /usr/src/app
 
@@ -10,7 +10,7 @@ RUN dotnet restore
 COPY . .
 RUN dotnet publish -c release -o out
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-bookworm-slim
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-bookworm-slim
 
 WORKDIR /usr/src/app