diff --git a/testutil/compose/static/lodestar/Dockerfile b/testutil/compose/static/lodestar/Dockerfile
index 5745c4528..57430c877 100644
--- a/testutil/compose/static/lodestar/Dockerfile
+++ b/testutil/compose/static/lodestar/Dockerfile
@@ -1,6 +1,6 @@
-FROM chainsafe/lodestar:v1.20.2
+FROM chainsafe/lodestar:v1.21.0
 
-RUN apk update && apk add curl jq wget
+RUN apt-get update && apt-get install -y curl jq wget
 
 ENV YQ_VERSION=v4.23.1
 ENV YQ_BINARY=yq_linux_amd64
diff --git a/testutil/compose/static/lodestar/run.sh b/testutil/compose/static/lodestar/run.sh
index b8350d0e1..b5b1c12ed 100755
--- a/testutil/compose/static/lodestar/run.sh
+++ b/testutil/compose/static/lodestar/run.sh
@@ -17,7 +17,7 @@ for f in /compose/"${NODE}"/validator_keys/keystore-*.json; do
     node /usr/app/packages/cli/bin/lodestar validator import \
         --network="dev" \
         --importKeystores="$f" \
-        --importKeystoresPassword="${f//json/txt}"
+        --importKeystoresPassword="${f%.json}.txt"
 done
 
 echo "Imported all keys"