diff --git a/values.yaml b/values.yaml
index e42b871..82c0457 100644
--- a/values.yaml
+++ b/values.yaml
@@ -279,7 +279,7 @@ mastodon:
       # streaming image split in Mastodon v4.3.0
       repository: ghcr.io/mastodon/mastodon-streaming
       # other options: `latest` for the latest release or `edge` for most recent commit
-      tag: null
+      tag: ""
     port: 4000
     # -- this should be set manually since os.cpus() returns the number of CPUs on
     # the node running the pod, which is unrelated to the resources allocated to