diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-
+# These images don't have Make, so commands are executed directly
 stages:
   - validate
   - build
@@ -8,7 +8,7 @@
   script:
     - csi scripts/LoadYaml.csx
     - csi scripts/LoadInk.csx
-  image: mcr.microsoft.com/dotnet/sdk:3.1-focal
+  image: mcr.microsoft.com/dotnet/sdk:5.0-focal
 
 build-debug:
   stage: build