diff --git a/.github/workflows/progress.yml b/.github/workflows/progress.yml
index e30b8ae410b..cc0f86bee5b 100644
--- a/.github/workflows/progress.yml
+++ b/.github/workflows/progress.yml
@@ -29,7 +29,7 @@ jobs:
         run: |
           echo ${{ secrets.PROGRESS_BOT_GCP_ACCOUNT_KEY }} | base64 -d > progress-bot-credentials.json
       - name: Report to Slack
-        uses: docker://sourcegraph/progress-bot:latest
+        uses: docker://sourcegraph/progress-bot:latest@sha256:a6c8906529fd752e40cbad20085904d4fa4ed085f567cf00682fdd9b8fcdd611
         env:
           SINCE: ${{ github.event.inputs.since || '24h' }}
           DRY: ${{ github.event.inputs.dry || 'false' }}
diff --git a/internal/cmd/progress-bot/main.go b/internal/cmd/progress-bot/main.go
index 941e8c990c6..8b2c2577b8c 100644
--- a/internal/cmd/progress-bot/main.go
+++ b/internal/cmd/progress-bot/main.go
@@ -36,7 +36,7 @@ func main() {
 	since := flag.Duration("since", 24*time.Hour, "Report new changelog entries since this period")
 	dry := flag.Bool("dry", false, "If true, print out the JSON payload that would be sent to the Slack API")
 	channel := flag.String("channel", "progress-bot-test", "Slack channel to post message to")
-	gcsBucket := flag.String("bucket", "sourcegraph-progress-bot-avatars", "GCS bucket to which generated group avatars are uploaded")
+	gcsBucket := flag.String("bucket", "sg-progress-bot-avatars", "GCS bucket to which generated group avatars are uploaded")
 
 	flag.Parse()