diff --git a/runtime/robonomics/src/xcm_config.rs b/runtime/robonomics/src/xcm_config.rs
index 1d717e45f..c1676885b 100644
--- a/runtime/robonomics/src/xcm_config.rs
+++ b/runtime/robonomics/src/xcm_config.rs
@@ -145,8 +145,8 @@ impl Contains<Location> for ParentOrParentsPlurality {
         }
         match &location.interior {
             Here => true,
-            Junctions::X1(arc) => {
-                matches!(arc.as_ref(), [Junction::Plurality { .. }])
+            Junctions::X1(junction) => {
+                matches!(junction, Junction::Plurality { .. })
             }
             _ => false,
         }
diff --git a/scripts/zombienet/ADDING_TESTS.md b/scripts/zombienet/ADDING_TESTS.md
index 46c1fa3e0..417f7f0b6 100644
--- a/scripts/zombienet/ADDING_TESTS.md
+++ b/scripts/zombienet/ADDING_TESTS.md
@@ -318,7 +318,7 @@ await api.tx.sudo.sudo(tx).signAndSend(sudo);
 
 ## XCM Testing Examples
 
-The test suite includes XCM (Cross-Consensus Messaging) v5 tests demonstrating cross-chain communication patterns.
+The test suite includes XCM (Cross-Consensus Messaging) v4 tests demonstrating cross-chain communication patterns.
 
 ### Testing XCM Upward Messages (Parachain → Relay Chain)
 
@@ -523,7 +523,7 @@ async function testAssetHubTransfer(testResults) {
 
 ### Key Points for XCM Tests
 
-1. **Use XCM v5 Types**: Always use `Location` (not `MultiLocation`) and the v5 API
+1. **Use XCM v4 Types**: Use the `Location` type (v4+) instead of the legacy v3 `MultiLocation`; the examples above use XCM v4 enums (e.g. `V4` variants).
 2. **Event Monitoring**: Subscribe to events on both source and destination chains
 3. **Timeouts**: XCM messages may take time to process; use appropriate timeouts
 4. **Weight Limits**: Specify weight limits for execution (Unlimited for testing)
diff --git a/scripts/zombienet/README.md b/scripts/zombienet/README.md
index 88af16f0f..c3d222e62 100644
--- a/scripts/zombienet/README.md
+++ b/scripts/zombienet/README.md
@@ -170,7 +170,7 @@ const TESTS_CONFIG = {
 
 ### XCM Tests
 
-The XCM test suite uses XCM v5 with the new `Location` types. All tests verify cross-chain message passing and execution.
+The XCM test suite uses XCM v4 with the new `Location` types. All tests verify cross-chain message passing and execution.
 
 #### 4. XCM Upward Message Test
 - **Purpose**: Tests XCM messages from parachain to relay chain
diff --git a/scripts/zombienet/run-tests.sh b/scripts/zombienet/run-tests.sh
index f37473c13..0c91f2920 100755
--- a/scripts/zombienet/run-tests.sh
+++ b/scripts/zombienet/run-tests.sh
@@ -19,7 +19,13 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
 
 # Configuration
+# NOTE: These version strings are pinned to specific upstream releases for compatibility
+# with this repository's zombienet test setup. When updating, ensure the new versions
+# remain compatible with the network configuration files in this directory.
+# Latest zombienet releases: https://github.com/paritytech/zombienet/releases
 ZOMBIENET_VERSION="v1.3.106"
+# Latest Polkadot node releases: https://github.com/paritytech/polkadot-sdk/releases
+# Use a version that matches the relay chain configuration used by these tests.
 POLKADOT_VERSION="stable2512"
 ZOMBIENET_BIN="${SCRIPT_DIR}/bin/zombienet-linux-x64"
 POLKADOT_BIN="${SCRIPT_DIR}/bin/polkadot"
diff --git a/scripts/zombienet/tests/xcm-tests.js b/scripts/zombienet/tests/xcm-tests.js
index 443571358..d07c0badc 100644
--- a/scripts/zombienet/tests/xcm-tests.js
+++ b/scripts/zombienet/tests/xcm-tests.js
@@ -203,7 +203,7 @@ async function testXcmDownwardMessage(testResults) {
     const dest = {
       V4: {
         parents: 0,
-        interior: { X1: { Parachain: parachainId.toString() } }
+        interior: { X1: { Parachain: parachainId.toNumber() } }
       }
     };
     
@@ -364,7 +364,7 @@ async function testAssetHubTransfer(testResults) {
     const dest = {
       V4: {
         parents: 1,
-        interior: { X1: { Parachain: '1000' } }
+        interior: { X1: { Parachain: 1000 } }
       }
     };
     
@@ -372,7 +372,7 @@ async function testAssetHubTransfer(testResults) {
     const beneficiary = {
       V4: {
         parents: 0,
-        interior: { X1: [{ AccountId32: { network: null, id: alice.publicKey } }] }
+        interior: { X1: { AccountId32: { network: null, id: alice.publicKey } } }
       }
     };