diff --git a/buildkit/Dockerfile b/buildkit/Dockerfile
index 1bf629d..7451a23 100644
--- a/buildkit/Dockerfile
+++ b/buildkit/Dockerfile
@@ -1,3 +1,4 @@
 FROM moby/buildkit:buildx-stable-1
+COPY internal-ca.crt /usr/local/share/ca-certificates/internal-ca.crt
 COPY intermediate-ca.crt /usr/local/share/ca-certificates/intermediate-ca.crt
 RUN apk add --no-cache ca-certificates && update-ca-certificates