diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,14 +15,14 @@
   stage: build
   script:
     - dotnet build isometric-park-fna-core.sln -f netcoreapp3.1
-  image: mcr.microsoft.com/dotnet/sdk:3.1-focal
+  image: mcr.microsoft.com/dotnet/sdk:5.0-focal
 
 
 build-release-windows:
   stage: build
   script:
     - dotnet build isometric-park-fna-core.sln -f netcoreapp3.1 -c Release
-  image: mcr.microsoft.com/dotnet/sdk:3.1
+  image: mcr.microsoft.com/dotnet/sdk:5.0
 
 build-release:
   stage: build
@@ -32,4 +32,4 @@
     paths:
       - screenshot.xwd
     expire_in: 1 week
-  image: mcr.microsoft.com/dotnet/sdk:3.1-focal
+  image: mcr.microsoft.com/dotnet/sdk:5.0-focal