diff --git a/requirements.txt b/requirements.txt
index 1621ad8..bb64b26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ setuptools==70.0.0
 tenacity==8.2.3
 typeguard==4.1.5
 typing-inspect==0.9.0
-typing_extensions==4.9.0
+typing_extensions>=4.10
 urllib3==2.2.2
 virtualenv==20.25.0
 Jinja2~=3.1.5
diff --git a/tests/data_confidentiality/test_data_confidentiality.py b/tests/data_confidentiality/test_data_confidentiality.py
index 500ef71..316b1ab 100644
--- a/tests/data_confidentiality/test_data_confidentiality.py
+++ b/tests/data_confidentiality/test_data_confidentiality.py
@@ -3,6 +3,7 @@ import json
 import tarfile
 
 import pytest
+from ruamel.yaml import YAML
 
 from src.client.nomos_cli import NomosCli
 from src.env_vars import CONSENSUS_SLOT_TIME, NOMOS_CUSTOM
@@ -15,6 +16,32 @@ from src.test_data import DATA_TO_DISPERSE
 logger = get_custom_logger(__name__)
 
 
+def modify_key_value(file_path, yaml_key_path):
+    yaml = YAML()
+    yaml.preserve_quotes = True
+
+    with open(file_path, "r") as f:
+        data = yaml.load(f)
+
+    keys = yaml_key_path.split(".")
+    ref = data
+    for key in keys[:-1]:
+        if key not in ref:
+            raise KeyError(f"Key '{key}' not found in path '{'.'.join(keys)}'")
+        ref = ref[key]
+
+    final_key = keys[-1]
+    if final_key not in ref:
+        raise KeyError(f"Key '{final_key}' not found in path '{'.'.join(keys)}'")
+
+    old_value = ref[final_key]
+    # Swap last two characters
+    ref[final_key] = old_value[:-2] + old_value[-1] + old_value[-2]
+
+    with open(file_path, "w") as f:
+        yaml.dump(data, f)
+
+
 class TestDataConfidentiality(StepsDataAvailability):
     main_nodes = []
 
@@ -45,6 +72,11 @@ class TestDataConfidentiality(StepsDataAvailability):
 
         self.node2.stop()
 
+        # Change the private key of the nomos_node_0 -> change its PeerId
+        modify_key_value("./cluster_config/config.yaml", "network.backend.node_key")
+        modify_key_value("./cluster_config/config.yaml", "blend.backend.node_key")
+        modify_key_value("./cluster_config/config.yaml", "da_network.backend.node_key")
+
         # Start new node with the same hostname and configuration as first node
         self.nodeX = NomosNode(NOMOS_CUSTOM, "nomos_node_0")
         self.nodeX.start()