diff --git a/src/Nocr.Users.Host/Dockerfile b/src/Nocr.Users.Host/Dockerfile
index 6c2caa8..1c585c0 100644
--- a/src/Nocr.Users.Host/Dockerfile
+++ b/src/Nocr.Users.Host/Dockerfile
@@ -16,8 +16,8 @@ RUN apt-get update && \
     update-ca-certificates && \
     rm -rf /var/lib/apt/lists/*
 
-# Copy nuget.config (copied to submodule root by CI/CD)
-COPY nuget.config /root/.nuget/NuGet/NuGet.Config
+# Copy nuget.config from parent repository (via additional_contexts)
+COPY --from=rootconfig nuget.config /root/.nuget/NuGet/NuGet.Config
 
 COPY . .
 
diff --git a/src/Nocr.Users.Migrator/Dockerfile b/src/Nocr.Users.Migrator/Dockerfile
index 6000546..2523a1f 100644
--- a/src/Nocr.Users.Migrator/Dockerfile
+++ b/src/Nocr.Users.Migrator/Dockerfile
@@ -10,8 +10,8 @@ RUN apt-get update && \
     update-ca-certificates && \
     rm -rf /var/lib/apt/lists/*
 
-# Copy nuget.config (copied to submodule root by CI/CD)
-COPY nuget.config /root/.nuget/NuGet/NuGet.Config
+# Copy nuget.config from parent repository (via additional_contexts)
+COPY --from=rootconfig nuget.config /root/.nuget/NuGet/NuGet.Config
 
 COPY . .