diff --git a/Cargo.lock b/Cargo.lock
index 71ccc4b5..8c1c9149 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -893,8 +893,7 @@ dependencies = [
 [[package]]
 name = "ant-node"
 version = "0.18.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3490dfb2cd08f4873b32d4328506038067c43a3662c5f6cb9dbb9db9e078e6d0"
+source = "git+https://github.com/WithAutonomi/ant-node?rev=31fcbae#31fcbae2688a1d81008ef1b57fe09eda4b13817b"
 dependencies = [
  "ant-protocol",
  "bao",
@@ -3304,7 +3303,7 @@ dependencies = [
  "js-sys",
  "log",
  "wasm-bindgen",
- "windows-core 0.57.0",
+ "windows-core 0.61.2",
 ]
 
 [[package]]
diff --git a/ant-core/Cargo.toml b/ant-core/Cargo.toml
index 86c8a0a8..3485f418 100644
--- a/ant-core/Cargo.toml
+++ b/ant-core/Cargo.toml
@@ -67,7 +67,14 @@ sysinfo = { version = "0.32", default-features = false, features = ["system"] }
 # `ant-protocol` pin above points at a released version, this ant-node must
 # track the matching released version carrying the same saorsa-core /
 # ant-protocol lineage.
-ant-node = { version = "0.18.1", optional = true }
+#
+# Temporarily pinned to the ant-node `main` commit that merged the file-per-chunk
+# chunk store (WithAutonomi/ant-node#216, V2-1033). That change replaced
+# `LmdbStorage` with `ChunkStore` in `AntProtocol::new`, which the test harness
+# in tests/support/mod.rs constructs, so 0.18.1 no longer compiles against it.
+# A rev, not a branch, so the pin is immutable. Swap back to a published
+# version pin (`ant-node = "0.19.0"`) once the release train publishes it.
+ant-node = { git = "https://github.com/WithAutonomi/ant-node", rev = "31fcbae", optional = true }
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
 [target.'cfg(unix)'.dependencies]
@@ -98,7 +105,9 @@ test-utils = []
 # always compile even without the `devnet` feature. Pinned to the same
 # version as the runtime dep so there is a single ant-node /
 # saorsa-core version across the whole graph.
-ant-node = { version = "0.18.1", features = ["test-utils"] }
+ant-node = { git = "https://github.com/WithAutonomi/ant-node", rev = "31fcbae", features = [
+    "test-utils",
+] }
 serial_test = "3"
 anyhow = "1"
 alloy = { version = "1.6", features = ["node-bindings"] }
diff --git a/ant-core/tests/support/mod.rs b/ant-core/tests/support/mod.rs
index 48a14ea1..a8a44aed 100644
--- a/ant-core/tests/support/mod.rs
+++ b/ant-core/tests/support/mod.rs
@@ -25,7 +25,7 @@ use ant_node::payment::{
     QuotingMetricsTracker,
 };
 use ant_node::replication::commitment_state::{BuiltCommitment, ResponderCommitmentState};
-use ant_node::storage::{AntProtocol, LmdbStorage, LmdbStorageConfig};
+use ant_node::storage::{AntProtocol, ChunkStore, ChunkStoreConfig, MigrationConfig};
 // Wire / transport / EVM types: route through ant-protocol so the test
 // harness exercises the same surface the client does.
 use ant_protocol::evm::{testnet::Testnet, Network as EvmNetwork, RewardsAddress, Wallet};
@@ -315,15 +315,20 @@ impl MiniTestnet {
         let node = Arc::new(P2PNode::new(core_config).await.expect("create P2P node"));
         node.start().await.expect("start P2P node");
 
-        // Create LMDB storage
-        let storage_config = LmdbStorageConfig {
+        // Create the chunk store. ant-node #216 replaced the LMDB chunk store
+        // with one file per chunk; `AntProtocol::new` now takes an
+        // `Arc<ChunkStore>`. These nodes start with no legacy environment, so
+        // the store comes up directly on the file backend and the migration
+        // never runs — this harness gives no LMDB-to-file migration coverage.
+        let storage_config = ChunkStoreConfig {
             root_dir: data_dir.to_path_buf(),
             verify_on_read: true,
             max_map_size: 0,
             disk_reserve: 0,
+            migration: MigrationConfig::default(),
         };
         let storage = Arc::new(
-            LmdbStorage::new(storage_config)
+            ChunkStore::new(storage_config)
                 .await
                 .expect("create storage"),
         );