diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a5804875e1..d025f610ff 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -32,6 +32,7 @@ run_tests:
     reports:
       junit:
         - test_output/*.coverage.xml
+  image: mcr.microsoft.com/dotnet/core/sdk:3.1
   script:
     - Dist/BuildTestRelease.sh
   stage: test