diff --git a/Dockerfile b/Dockerfile
index 45c4464..06695c7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0
+FROM mcr.microsoft.com/dotnet/sdk:9.0@sha256:faa2daf2b72cbe787ee1882d9651fa4ef3e938ee56792b8324516f5a448f3abe
 WORKDIR /scip-dotnet
 ADD . /scip-dotnet
 RUN dotnet pack