diff --git a/Dockerfile b/Dockerfile
index 45c4464..56fbbeb 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:ae000be75dac94fc40e00f0eee903289e985995cc06dac3937469254ce5b60b6
 WORKDIR /scip-dotnet
 ADD . /scip-dotnet
 RUN dotnet pack