diff --git a/judgels-backends/judgels-server-app/src/main/java/judgels/jerahmeel/submission/programming/SubmissionResource.java b/judgels-backends/judgels-server-app/src/main/java/judgels/jerahmeel/submission/programming/SubmissionResource.java
index c41e317b7..4e2e6cb95 100644
--- a/judgels-backends/judgels-server-app/src/main/java/judgels/jerahmeel/submission/programming/SubmissionResource.java
+++ b/judgels-backends/judgels-server-app/src/main/java/judgels/jerahmeel/submission/programming/SubmissionResource.java
@@ -287,7 +287,7 @@ public void regradeSubmission(
 
     @POST
     @Path("/regrade")
-    @UnitOfWork
+    @UnitOfWork(transactional = false)
     public void regradeSubmissions(
             @HeaderParam(AUTHORIZATION) AuthHeader authHeader,
             @QueryParam("containerJid") Optional<String> containerJid,
diff --git a/judgels-backends/judgels-server-app/src/main/java/judgels/uriel/contest/scoreboard/ContestScoreboardPoller.java b/judgels-backends/judgels-server-app/src/main/java/judgels/uriel/contest/scoreboard/ContestScoreboardPoller.java
index 40ba0733a..975fc4290 100644
--- a/judgels-backends/judgels-server-app/src/main/java/judgels/uriel/contest/scoreboard/ContestScoreboardPoller.java
+++ b/judgels-backends/judgels-server-app/src/main/java/judgels/uriel/contest/scoreboard/ContestScoreboardPoller.java
@@ -30,7 +30,7 @@ public ContestScoreboardPoller(
     }
 
     @Override
-    @UnitOfWork(readOnly = true)
+    @UnitOfWork(readOnly = true, transactional = false)
     public void run() {
         try {
             for (Contest contest : contestStore.getRunningContests()) {