diff --git a/corporate/lib/stripe.py b/corporate/lib/stripe.py
index b11276bb4b..429504b36d 100644
--- a/corporate/lib/stripe.py
+++ b/corporate/lib/stripe.py
@@ -633,7 +633,7 @@ def do_change_remote_server_plan_type(remote_server: RemoteZulipServer, plan_typ
         event_type=RealmAuditLog.REMOTE_SERVER_PLAN_TYPE_CHANGED,
         server=remote_server,
         event_time=timezone_now(),
-        extra_data={"old_value": old_value, "new_value": plan_type},
+        extra_data=str({"old_value": old_value, "new_value": plan_type}),
     )
 
 
@@ -951,7 +951,7 @@ def attach_discount_to_realm(
         acting_user=acting_user,
         event_type=RealmAuditLog.REALM_DISCOUNT_CHANGED,
         event_time=timezone_now(),
-        extra_data={"old_discount": old_discount, "new_discount": discount},
+        extra_data=str({"old_discount": old_discount, "new_discount": discount}),
     )
 
 
@@ -966,9 +966,7 @@ def update_sponsorship_status(
         acting_user=acting_user,
         event_type=RealmAuditLog.REALM_SPONSORSHIP_PENDING_STATUS_CHANGED,
         event_time=timezone_now(),
-        extra_data={
-            "sponsorship_pending": sponsorship_pending,
-        },
+        extra_data=str({"sponsorship_pending": sponsorship_pending}),
     )
 
 
@@ -1213,7 +1211,5 @@ def update_billing_method_of_current_plan(
             acting_user=acting_user,
             event_type=RealmAuditLog.REALM_BILLING_METHOD_CHANGED,
             event_time=timezone_now(),
-            extra_data={
-                "charge_automatically": charge_automatically,
-            },
+            extra_data=str({"charge_automatically": charge_automatically}),
         )
diff --git a/zerver/actions/create_realm.py b/zerver/actions/create_realm.py
index 48afc3e513..b362ab23a7 100644
--- a/zerver/actions/create_realm.py
+++ b/zerver/actions/create_realm.py
@@ -57,7 +57,7 @@ def do_change_realm_subdomain(
             event_type=RealmAuditLog.REALM_SUBDOMAIN_CHANGED,
             event_time=timezone_now(),
             acting_user=acting_user,
-            extra_data={"old_subdomain": old_subdomain, "new_subdomain": new_subdomain},
+            extra_data=str({"old_subdomain": old_subdomain, "new_subdomain": new_subdomain}),
         )
 
         # If a realm if being renamed multiple times, we should find all the placeholder
diff --git a/zerver/actions/realm_icon.py b/zerver/actions/realm_icon.py
index 1ba7cba42e..f5f6e10512 100644
--- a/zerver/actions/realm_icon.py
+++ b/zerver/actions/realm_icon.py
@@ -20,7 +20,7 @@ def do_change_icon_source(
     RealmAuditLog.objects.create(
         realm=realm,
         event_type=RealmAuditLog.REALM_ICON_SOURCE_CHANGED,
-        extra_data={"icon_source": icon_source, "icon_version": realm.icon_version},
+        extra_data=str({"icon_source": icon_source, "icon_version": realm.icon_version}),
         event_time=event_time,
         acting_user=acting_user,
     )
diff --git a/zerver/actions/realm_settings.py b/zerver/actions/realm_settings.py
index 8de623f461..f61e30d2aa 100644
--- a/zerver/actions/realm_settings.py
+++ b/zerver/actions/realm_settings.py
@@ -400,7 +400,7 @@ def do_change_realm_org_type(
         realm=realm,
         event_time=timezone_now(),
         acting_user=acting_user,
-        extra_data={"old_value": old_value, "new_value": org_type},
+        extra_data=str({"old_value": old_value, "new_value": org_type}),
     )
 
     event = dict(type="realm", op="update", property="org_type", value=org_type)
@@ -419,7 +419,7 @@ def do_change_realm_plan_type(
         realm=realm,
         event_time=timezone_now(),
         acting_user=acting_user,
-        extra_data={"old_value": old_value, "new_value": plan_type},
+        extra_data=str({"old_value": old_value, "new_value": plan_type}),
     )
 
     if plan_type == Realm.PLAN_TYPE_PLUS:
diff --git a/zerver/actions/user_settings.py b/zerver/actions/user_settings.py
index 92b68131a6..6418fea7d3 100644
--- a/zerver/actions/user_settings.py
+++ b/zerver/actions/user_settings.py
@@ -300,7 +300,7 @@ def do_change_avatar_fields(
         realm=user_profile.realm,
         modified_user=user_profile,
         event_type=RealmAuditLog.USER_AVATAR_SOURCE_CHANGED,
-        extra_data={"avatar_source": avatar_source},
+        extra_data=str({"avatar_source": avatar_source}),
         event_time=event_time,
         acting_user=acting_user,
     )