diff --git a/hack/azblob_test/test1/Dockerfile b/hack/azblob_test/test1/Dockerfile
index 11a688b0828a..d56dd9d1fd92 100644
--- a/hack/azblob_test/test1/Dockerfile
+++ b/hack/azblob_test/test1/Dockerfile
@@ -1,4 +1,4 @@
-FROM busybox AS build
+FROM busybox:1.35 AS build
 RUN cat /dev/urandom | head -c 100 | sha256sum > unique_first
 RUN cat /dev/urandom | head -c 100 | sha256sum > unique_second
 
diff --git a/hack/azblob_test/test2/Dockerfile b/hack/azblob_test/test2/Dockerfile
index a6590a9140b7..c0efe23b40c6 100644
--- a/hack/azblob_test/test2/Dockerfile
+++ b/hack/azblob_test/test2/Dockerfile
@@ -1,4 +1,4 @@
-FROM busybox AS build
+FROM busybox:1.35 AS build
 RUN cat /dev/urandom | head -c 100 | sha256sum > unique_first
 RUN cat /dev/urandom | head -c 100 | sha256sum > unique_second
 RUN cat /dev/urandom | head -c 100 | sha256sum > unique_third