diff --git a/TransitApi/Dockerfile.arm b/TransitApi/Dockerfile.arm
index cb56ed5..0d6367c 100644
--- a/TransitApi/Dockerfile.arm
+++ b/TransitApi/Dockerfile.arm
@@ -1,9 +1,9 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 COPY ["TransitApi/TransitApi.csproj", "TransitApi/"]
 RUN dotnet restore "TransitApi/TransitApi.csproj"
diff --git a/TransitWebViewer/Dockerfile.arm b/TransitWebViewer/Dockerfile.arm
index a5fc416..2e51cd3 100644
--- a/TransitWebViewer/Dockerfile.arm
+++ b/TransitWebViewer/Dockerfile.arm
@@ -1,9 +1,9 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 WORKDIR /app
 EXPOSE 80
 EXPOSE 443
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 COPY ["TransitWebViewer/TransitWebViewer.csproj", "TransitWebViewer/"]
 RUN dotnet restore "TransitWebViewer/TransitWebViewer.csproj"