diff --git a/Dockerfile b/Dockerfile
index ba87745..dee25be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
+FROM mcr.microsoft.com/dotnet/sdk:3.1 AS build
 WORKDIR /app
 
 LABEL "com.github.actions.name"="Microsoft Teams (Generic)"