diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 65df470..d524989 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ build_lib_test:
 
 build_lib_release:
   stage: build
-  image: mono:5.8
+  image: mcr.microsoft.com/dotnet/core/sdk:3.1-buster
   script:
     - export BUILD_VERSION=$(echo $CI_COMMIT_REF_NAME | sed  's/\([0-9]\+\.[0-9]\+\.[0-9]\+\)\-release$/\1/g')
     - echo $BUILD_VERSION
@@ -78,4 +78,4 @@ pages:
   tags:
     - docker
   only:
-    - master
\ No newline at end of file
+    - master