diff --git a/CHANGELOG.md b/CHANGELOG.md
index d963f159a6a..30bca31a34a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ As a minor extension, we have adopted a slightly different versioning convention
   - Chunk the Cardano transactions import in `mithril-signer` to reduce disk footprint by running the pruning process more frequently.
   - Add a database connection pool on the Cardano transaction repository for increased performances of the prover.
   - Import Cardano transactions with Chain Sync mini protocol and Pallas chain reader.
+  - Avoid aggregator and signer being blocked when importing the Cardano transactions.
 
 - Crates versions:
 
diff --git a/Cargo.lock b/Cargo.lock
index c6acb427097..aa3107d3995 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3547,7 +3547,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-aggregator"
-version = "0.5.33"
+version = "0.5.34"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -3848,7 +3848,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-signer"
-version = "0.2.156"
+version = "0.2.157"
 dependencies = [
  "anyhow",
  "async-trait",
diff --git a/mithril-aggregator/Cargo.toml b/mithril-aggregator/Cargo.toml
index 77b1ae7a8cb..c3fcf928e70 100644
--- a/mithril-aggregator/Cargo.toml
+++ b/mithril-aggregator/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-aggregator"
-version = "0.5.33"
+version = "0.5.34"
 description = "A Mithril Aggregator server"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-aggregator/src/services/cardano_transactions_importer.rs b/mithril-aggregator/src/services/cardano_transactions_importer.rs
index ba73188ca40..dc81c1b94fe 100644
--- a/mithril-aggregator/src/services/cardano_transactions_importer.rs
+++ b/mithril-aggregator/src/services/cardano_transactions_importer.rs
@@ -5,6 +5,7 @@ use std::sync::Arc;
 
 use async_trait::async_trait;
 use slog::{debug, Logger};
+use tokio::{runtime::Handle, task};
 
 use mithril_common::cardano_block_scanner::{BlockScanner, ChainScannedBlocks};
 use mithril_common::crypto_helper::{MKTree, MKTreeNode};
@@ -174,13 +175,25 @@ impl CardanoTransactionsImporter {
             .store_block_range_roots(block_ranges_with_merkle_root)
             .await
     }
+
+    async fn import_transactions_and_block_ranges(
+        &self,
+        up_to_beacon: BlockNumber,
+    ) -> StdResult<()> {
+        self.import_transactions(up_to_beacon).await?;
+        self.import_block_ranges().await
+    }
 }
 
 #[async_trait]
 impl TransactionsImporter for CardanoTransactionsImporter {
     async fn import(&self, up_to_beacon: BlockNumber) -> StdResult<()> {
-        self.import_transactions(up_to_beacon).await?;
-        self.import_block_ranges().await
+        task::block_in_place(move || {
+            Handle::current().block_on(async move {
+                self.import_transactions_and_block_ranges(up_to_beacon)
+                    .await
+            })
+        })
     }
 }
 
@@ -639,7 +652,7 @@ mod tests {
         );
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn importing_twice_starting_with_nothing_in_a_real_db_should_yield_transactions_in_same_order(
     ) {
         let blocks = vec![
@@ -676,7 +689,7 @@ mod tests {
         assert_eq!(cold_imported_transactions, warm_imported_transactions);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn when_rollbackward_should_remove_transactions() {
         let connection = cardano_tx_db_connection().unwrap();
         let repository = Arc::new(CardanoTransactionRepository::new(Arc::new(
@@ -719,7 +732,7 @@ mod tests {
         assert_eq!(expected_remaining_transactions, stored_transactions);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn when_rollbackward_should_remove_block_ranges() {
         let connection = cardano_tx_db_connection().unwrap();
         let repository = Arc::new(CardanoTransactionRepository::new(Arc::new(
diff --git a/mithril-aggregator/tests/create_certificate.rs b/mithril-aggregator/tests/create_certificate.rs
index c7e9b93d8b1..324a1aba678 100644
--- a/mithril-aggregator/tests/create_certificate.rs
+++ b/mithril-aggregator/tests/create_certificate.rs
@@ -10,7 +10,7 @@ use mithril_common::{
 };
 use test_extensions::{utilities::get_test_dir, ExpectedCertificate, RuntimeTester};
 
-#[tokio::test]
+#[tokio::test(flavor = "multi_thread")]
 async fn create_certificate() {
     let protocol_parameters = ProtocolParameters {
         k: 5,
diff --git a/mithril-signer/Cargo.toml b/mithril-signer/Cargo.toml
index b890b1d168f..34ae8565bec 100644
--- a/mithril-signer/Cargo.toml
+++ b/mithril-signer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-signer"
-version = "0.2.156"
+version = "0.2.157"
 description = "A Mithril Signer"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-signer/src/cardano_transactions_importer.rs b/mithril-signer/src/cardano_transactions_importer.rs
index ba73188ca40..dc81c1b94fe 100644
--- a/mithril-signer/src/cardano_transactions_importer.rs
+++ b/mithril-signer/src/cardano_transactions_importer.rs
@@ -5,6 +5,7 @@ use std::sync::Arc;
 
 use async_trait::async_trait;
 use slog::{debug, Logger};
+use tokio::{runtime::Handle, task};
 
 use mithril_common::cardano_block_scanner::{BlockScanner, ChainScannedBlocks};
 use mithril_common::crypto_helper::{MKTree, MKTreeNode};
@@ -174,13 +175,25 @@ impl CardanoTransactionsImporter {
             .store_block_range_roots(block_ranges_with_merkle_root)
             .await
     }
+
+    async fn import_transactions_and_block_ranges(
+        &self,
+        up_to_beacon: BlockNumber,
+    ) -> StdResult<()> {
+        self.import_transactions(up_to_beacon).await?;
+        self.import_block_ranges().await
+    }
 }
 
 #[async_trait]
 impl TransactionsImporter for CardanoTransactionsImporter {
     async fn import(&self, up_to_beacon: BlockNumber) -> StdResult<()> {
-        self.import_transactions(up_to_beacon).await?;
-        self.import_block_ranges().await
+        task::block_in_place(move || {
+            Handle::current().block_on(async move {
+                self.import_transactions_and_block_ranges(up_to_beacon)
+                    .await
+            })
+        })
     }
 }
 
@@ -639,7 +652,7 @@ mod tests {
         );
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn importing_twice_starting_with_nothing_in_a_real_db_should_yield_transactions_in_same_order(
     ) {
         let blocks = vec![
@@ -676,7 +689,7 @@ mod tests {
         assert_eq!(cold_imported_transactions, warm_imported_transactions);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn when_rollbackward_should_remove_transactions() {
         let connection = cardano_tx_db_connection().unwrap();
         let repository = Arc::new(CardanoTransactionRepository::new(Arc::new(
@@ -719,7 +732,7 @@ mod tests {
         assert_eq!(expected_remaining_transactions, stored_transactions);
     }
 
-    #[tokio::test]
+    #[tokio::test(flavor = "multi_thread")]
     async fn when_rollbackward_should_remove_block_ranges() {
         let connection = cardano_tx_db_connection().unwrap();
         let repository = Arc::new(CardanoTransactionRepository::new(Arc::new(
diff --git a/mithril-signer/tests/create_cardano_transaction_single_signature.rs b/mithril-signer/tests/create_cardano_transaction_single_signature.rs
index 42b19245755..52cb5710b02 100644
--- a/mithril-signer/tests/create_cardano_transaction_single_signature.rs
+++ b/mithril-signer/tests/create_cardano_transaction_single_signature.rs
@@ -9,7 +9,7 @@ use mithril_common::{
 use test_extensions::StateMachineTester;
 
 #[rustfmt::skip]
-#[tokio::test]
+#[tokio::test(flavor = "multi_thread")]
 async fn test_create_cardano_transaction_single_signature() {
     let protocol_parameters = tests_setup::setup_protocol_parameters();
     let fixture = MithrilFixtureBuilder::default()