diff --git a/.circleci/config.yml b/.circleci/config.yml
index 311732b..107e8f1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,9 +6,9 @@ orbs:
 jobs:
   build:
     docker:
-      - image: mcr.microsoft.com/dotnet/core/sdk:3.0
+      - image: mcr.microsoft.com/dotnet/core/sdk:3.1
     environment:
-      DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX: 2
+      DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX: 0
     steps:
       - checkout
       - run: