diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 543dc1f..bc81ae0 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -2,6 +2,10 @@ FROM mcr.microsoft.com/devcontainers/javascript-node:1-22-bookworm
 # Copy the Sophos CA certificate into the container
 COPY sophos.crt /usr/local/share/ca-certificates/sophos.crt
 COPY mitutoyo.crt /usr/local/share/ca-certificates/mitutoyo.crt
+# Merge multiple CA certificates into one file
+RUN cat /usr/local/share/ca-certificates/sophos.crt \
+        /usr/local/share/ca-certificates/mitutoyo.crt \
+        > /usr/local/share/ca-certificates/custom-ca.pem
 # Update system CA certificates
 RUN update-ca-certificates
 # Install MongoDB command line tools - though mongo-database-tools not available on arm64