diff --git a/.github/workflows/zephyr.yml b/.github/workflows/zephyr.yml
index 281e1a5544da..e6de975e661d 100644
--- a/.github/workflows/zephyr.yml
+++ b/.github/workflows/zephyr.yml
@@ -20,5 +20,5 @@ jobs:
 
       - name: build
         run: docker run -v "$(pwd)":/workdir
-             docker.io/zephyrprojectrtos/zephyr-build:latest
+             docker.io/zephyrprojectrtos/zephyr-build:v0.17.3
              ./zephyr/docker-build.sh
diff --git a/zephyr/docker-build.sh b/zephyr/docker-build.sh
index 80bae2cc5bf1..105eed94f34b 100755
--- a/zephyr/docker-build.sh
+++ b/zephyr/docker-build.sh
@@ -8,14 +8,8 @@
 set -e
 set -x
 
-# export http_proxy=...
-# export https_proxy=...
-
 unset ZEPHYR_BASE
 
-sudo --preserve-env=http_proxy,https_proxy apt-get update
-sudo --preserve-env=http_proxy,https_proxy apt-get -y install libssl-dev
-
 # Make sure we're in the right place; chgrp -R below.
 test -e ./scripts/xtensa-build-zephyr.sh