diff --git a/Cargo.lock b/Cargo.lock
index 29d8a0a5295..48011f69931 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4252,7 +4252,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-common"
-version = "0.6.20"
+version = "0.6.21"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4335,7 +4335,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-end-to-end"
-version = "0.4.104"
+version = "0.4.105"
 dependencies = [
  "anyhow",
  "async-recursion",
diff --git a/mithril-common/Cargo.toml b/mithril-common/Cargo.toml
index 205e0318153..85e2e0d48a8 100644
--- a/mithril-common/Cargo.toml
+++ b/mithril-common/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-common"
-version = "0.6.20"
+version = "0.6.21"
 description = "Common types, interfaces, and utilities for Mithril nodes."
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-common/src/messages/aggregator_features.rs b/mithril-common/src/messages/aggregator_features.rs
index 1db70bee679..0b00114a6b6 100644
--- a/mithril-common/src/messages/aggregator_features.rs
+++ b/mithril-common/src/messages/aggregator_features.rs
@@ -26,6 +26,7 @@ pub struct AggregatorCapabilities {
     pub signed_entity_types: BTreeSet<SignedEntityTypeDiscriminants>,
 
     /// Aggregate signature type used by the aggregator
+    #[serde(default)]
     pub aggregate_signature_type: AggregateSignatureType,
 
     /// Cardano transactions prover capabilities
diff --git a/mithril-test-lab/mithril-end-to-end/Cargo.toml b/mithril-test-lab/mithril-end-to-end/Cargo.toml
index b92a31be63c..f7dc102b4bb 100644
--- a/mithril-test-lab/mithril-end-to-end/Cargo.toml
+++ b/mithril-test-lab/mithril-end-to-end/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-end-to-end"
-version = "0.4.104"
+version = "0.4.105"
 authors = { workspace = true }
 edition = { workspace = true }
 documentation = { workspace = true }
diff --git a/mithril-test-lab/mithril-end-to-end/src/mithril/client.rs b/mithril-test-lab/mithril-end-to-end/src/mithril/client.rs
index d7a7ad4b4f8..04d3e6847ea 100644
--- a/mithril-test-lab/mithril-end-to-end/src/mithril/client.rs
+++ b/mithril-test-lab/mithril-end-to-end/src/mithril/client.rs
@@ -220,9 +220,12 @@ impl ClientCommand {
             ClientCommand::CardanoStakeDistribution(cmd) => {
                 [vec!["cardano-stake-distribution".to_string()], cmd.cli_arg()].concat()
             }
-            ClientCommand::CardanoDbV2(cmd) => {
-                [vec!["cardano-db".to_string()], cmd.cli_arg()].concat()
-            }
+            ClientCommand::CardanoDbV2(cmd) => [
+                vec!["cardano-db".to_string()],
+                cmd.cli_arg(),
+                vec!["--backend".to_string(), "v2".to_string()],
+            ]
+            .concat(),
         };
         args.push("--json".to_string());