diff --git a/apps/explorer/lib/explorer/chain/events/listener.ex b/apps/explorer/lib/explorer/chain/events/listener.ex
index 8ff076a014..40a4131e84 100644
--- a/apps/explorer/lib/explorer/chain/events/listener.ex
+++ b/apps/explorer/lib/explorer/chain/events/listener.ex
@@ -30,6 +30,7 @@ defmodule Explorer.Chain.Events.Listener do
     {:noreply, state}
   end
 
+  # sobelow_skip ["Misc.BinToTerm"]
   defp decode_payload!(payload) do
     payload
     |> Base.decode64!()
diff --git a/apps/explorer/lib/explorer/chain/events/publisher.ex b/apps/explorer/lib/explorer/chain/events/publisher.ex
index 8bb59fac65..31374e19f0 100644
--- a/apps/explorer/lib/explorer/chain/events/publisher.ex
+++ b/apps/explorer/lib/explorer/chain/events/publisher.ex
@@ -2,6 +2,7 @@ defmodule Explorer.Chain.Events.Publisher do
   @moduledoc """
   Publishes events related to the Chain context.
   """
+  alias Ecto.Adapters.SQL.Sandbox
   alias Explorer.Repo
 
   @allowed_events ~w(addresses address_coin_balances blocks block_rewards internal_transactions token_transfers transactions contract_verification_result)a
@@ -17,11 +18,12 @@ defmodule Explorer.Chain.Events.Publisher do
   @spec broadcast(atom()) :: :ok
   def broadcast(event_type) do
     send_data(event_type)
+    :ok
   end
 
   defp send_data(event_type) do
     payload = encode_payload({:chain_event, event_type})
-    Repo.query("NOTIFY chain_event, '#{payload}';")
+    send_notify(payload)
   end
 
   # The :catchup type of event is not being consumed right now.
@@ -31,12 +33,24 @@ defmodule Explorer.Chain.Events.Publisher do
 
   defp send_data(event_type, broadcast_type, event_data) do
     payload = encode_payload({:chain_event, event_type, broadcast_type, event_data})
-    Repo.query("NOTIFY chain_event, '#{payload}';")
+    send_notify(payload)
   end
 
   defp encode_payload(payload) do
     payload
-    |> :erlang.term_to_binary()
+    |> :erlang.term_to_binary([:compressed])
     |> Base.encode64()
   end
+
+  defp send_notify(payload) do
+    fun = fn ->
+      Repo.query("select pg_notify('chain_event', $1::text);", [payload])
+    end
+
+    if Mix.env() == :test do
+      Sandbox.unboxed_run(Repo, fun)
+    else
+      fun.()
+    end
+  end
 end
diff --git a/apps/explorer/test/explorer/chain/events/publisher_test.exs b/apps/explorer/test/explorer/chain/events/publisher_test.exs
index ef76126086..e0934a53dd 100644
--- a/apps/explorer/test/explorer/chain/events/publisher_test.exs
+++ b/apps/explorer/test/explorer/chain/events/publisher_test.exs
@@ -15,7 +15,7 @@ defmodule Explorer.Chain.Events.PublisherTest do
 
       Publisher.broadcast([{event_type, event_data}], broadcast_type)
 
-      assert_received {:chain_event, ^event_type, ^broadcast_type, []}
+      assert_receive {:chain_event, ^event_type, ^broadcast_type, []}
     end
 
     test "won't send chain_event of catchup type" do
@@ -27,7 +27,7 @@ defmodule Explorer.Chain.Events.PublisherTest do
 
       Publisher.broadcast([{event_type, event_data}], broadcast_type)
 
-      refute_received {:chain_event, ^event_type, ^broadcast_type, []}
+      refute_receive {:chain_event, ^event_type, ^broadcast_type, []}
     end
 
     test "won't send event that is not allowed" do
@@ -59,7 +59,7 @@ defmodule Explorer.Chain.Events.PublisherTest do
 
       Publisher.broadcast(event_type)
 
-      assert_received {:chain_event, ^event_type}
+      assert_receive {:chain_event, ^event_type}
     end
   end
 end
diff --git a/apps/explorer/test/explorer/chain/events/subscriber_test.exs b/apps/explorer/test/explorer/chain/events/subscriber_test.exs
index 531efc24b2..b26841d0ef 100644
--- a/apps/explorer/test/explorer/chain/events/subscriber_test.exs
+++ b/apps/explorer/test/explorer/chain/events/subscriber_test.exs
@@ -15,7 +15,7 @@ defmodule Explorer.Chain.Events.SubscriberTest do
 
       Publisher.broadcast([{event_type, event_data}], broadcast_type)
 
-      assert_received {:chain_event, :blocks, :realtime, []}
+      assert_receive {:chain_event, :blocks, :realtime, []}
     end
   end
 
@@ -27,7 +27,7 @@ defmodule Explorer.Chain.Events.SubscriberTest do
 
       Publisher.broadcast(event_type)
 
-      assert_received {:chain_event, :exchange_rate}
+      assert_receive {:chain_event, :exchange_rate}
     end
   end
 end
diff --git a/apps/explorer/test/explorer/chain/import_test.exs b/apps/explorer/test/explorer/chain/import_test.exs
index dd3bbf1aec..0c559bdfec 100644
--- a/apps/explorer/test/explorer/chain/import_test.exs
+++ b/apps/explorer/test/explorer/chain/import_test.exs
@@ -470,27 +470,27 @@ defmodule Explorer.Chain.ImportTest do
     test "publishes addresses with updated fetched_coin_balance data to subscribers on insert" do
       Subscriber.to(:addresses, :realtime)
       Import.all(@import_data)
-      assert_received {:chain_event, :addresses, :realtime, [%Address{}, %Address{}, %Address{}]}
+      assert_receive {:chain_event, :addresses, :realtime, [%Address{}, %Address{}, %Address{}]}
     end
 
     test "publishes block data to subscribers on insert" do
       Subscriber.to(:blocks, :realtime)
       Import.all(@import_data)
-      assert_received {:chain_event, :blocks, :realtime, [%Block{}]}
+      assert_receive {:chain_event, :blocks, :realtime, [%Block{}]}
     end
 
     test "publishes internal_transaction data to subscribers on insert" do
       Subscriber.to(:internal_transactions, :realtime)
       Import.all(@import_data)
 
-      assert_received {:chain_event, :internal_transactions, :realtime,
-                       [%{transaction_hash: _, index: _}, %{transaction_hash: _, index: _}]}
+      assert_receive {:chain_event, :internal_transactions, :realtime,
+                      [%{transaction_hash: _, index: _}, %{transaction_hash: _, index: _}]}
     end
 
     test "publishes transactions data to subscribers on insert" do
       Subscriber.to(:transactions, :realtime)
       Import.all(@import_data)
-      assert_received {:chain_event, :transactions, :realtime, [%Transaction{}]}
+      assert_receive {:chain_event, :transactions, :realtime, [%Transaction{}]}
     end
 
     test "publishes token_transfers data to subscribers on insert" do
@@ -498,7 +498,7 @@ defmodule Explorer.Chain.ImportTest do
 
       Import.all(@import_data)
 
-      assert_received {:chain_event, :token_transfers, :realtime, [%TokenTransfer{}]}
+      assert_receive {:chain_event, :token_transfers, :realtime, [%TokenTransfer{}]}
     end
 
     test "does not broadcast if broadcast option is false" do