diff --git a/Dockerfile.CompressImages b/Dockerfile.CompressImages
index bd2e874a6..d4e9b2dcf 100644
--- a/Dockerfile.CompressImages
+++ b/Dockerfile.CompressImages
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS dotnet
+FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS dotnet
 
 COPY . /src/
 RUN mkdir -p /home/site/wwwroot