diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59e6d546ed..e603767f1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Fixes
 - [#4236](https://github.com/blockscout/blockscout/pull/4236) - Fix typo, constructor instead of contructor
+- [#4167](https://github.com/blockscout/blockscout/pull/4167) - Deduplicate block numbers in acquire_blocks function
 - [#4149](https://github.com/blockscout/blockscout/pull/4149) - Exclude smart_contract_additional_sources from JSON encoding in address schema
 - [#4137](https://github.com/blockscout/blockscout/pull/4137) - Get token balance query improvement
 - [#4038](https://github.com/blockscout/blockscout/pull/4038) - Add clause for abi_decode_address_output/1 when is_nil(address)
diff --git a/apps/explorer/lib/explorer/chain/import/runner/internal_transactions.ex b/apps/explorer/lib/explorer/chain/import/runner/internal_transactions.ex
index a836b86949..3f38efbfe8 100644
--- a/apps/explorer/lib/explorer/chain/import/runner/internal_transactions.ex
+++ b/apps/explorer/lib/explorer/chain/import/runner/internal_transactions.ex
@@ -214,7 +214,10 @@ defmodule Explorer.Chain.Import.Runner.InternalTransactions do
   end
 
   defp acquire_blocks(repo, changes_list) do
-    block_numbers = Enum.map(changes_list, & &1.block_number)
+    block_numbers =
+      changes_list
+      |> Enum.map(& &1.block_number)
+      |> Enum.dedup()
 
     query =
       from(