diff --git a/.tangled/workflows/ci.yml b/.tangled/workflows/ci.yml
index a701809..0e29669 100644
--- a/.tangled/workflows/ci.yml
+++ b/.tangled/workflows/ci.yml
@@ -21,6 +21,10 @@ steps:
       CGO_ENABLED: "0"
       GOCACHE: "/tangled/workspace/.cache/go-build"
       GOMODCACHE: "/tangled/workspace/.cache/go-mod"
+      # The spindle pod carries an Athens sidecar; host.docker.internal
+      # is the docker host gateway, which is that pod. The fallbacks
+      # keep builds working when the sidecar is down.
+      GOPROXY: "http://host.docker.internal:3000,https://proxy.golang.org,direct"
     command: |
       ./check-coverage
 
@@ -29,6 +33,10 @@ steps:
       CGO_ENABLED: "0"
       GOCACHE: "/tangled/workspace/.cache/go-build"
       GOMODCACHE: "/tangled/workspace/.cache/go-mod"
+      # The spindle pod carries an Athens sidecar; host.docker.internal
+      # is the docker host gateway, which is that pod. The fallbacks
+      # keep builds working when the sidecar is down.
+      GOPROXY: "http://host.docker.internal:3000,https://proxy.golang.org,direct"
       KO_DOCKER_REPO: "atcr.io/guid.foo/wicket"
     command: |
       export VERSION="$(date -u +%Y%m%d%H%M%S)-$(git rev-parse --short HEAD)"