diff --git a/tools/ci.sh b/tools/ci.sh
index bf5b1fd043..5312de8a94 100755
--- a/tools/ci.sh
+++ b/tools/ci.sh
@@ -603,15 +603,18 @@ function ci_windows_build {
 ########################################################################################
 # ports/zephyr
 
+ZEPHYR_DOCKER_VERSION=v0.21.0
+ZEPHYR_SDK_VERSION=0.13.2
+
 function ci_zephyr_setup {
-    docker pull zephyrprojectrtos/ci:v0.17.3
+    docker pull zephyrprojectrtos/ci:${ZEPHYR_DOCKER_VERSION}
     docker run --name zephyr-ci -d -it \
       -v "$(pwd)":/micropython \
-      -e ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-0.12.4 \
+      -e ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION} \
       -e ZEPHYR_TOOLCHAIN_VARIANT=zephyr \
       -e ZEPHYR_BASE=/zephyrproject/zephyr \
       -w /micropython/ports/zephyr \
-      zephyrprojectrtos/ci:v0.17.3
+      zephyrprojectrtos/ci:${ZEPHYR_DOCKER_VERSION}
     docker ps -a
 }