diff --git a/README.md b/README.md
index ba269b6..474ec21 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,6 @@ The goal is to generate an existing infrastructure on Netbox and have the abilit
 
 * The project is only compatible with Linux.
 Since it uses `ethtool` and parses `/sys/` directory, it's not compatible with *BSD distributions.
-* Netbox `>=2.6.0,<=2.6.2` has a caching problem ; if the cache lifetime is too high, the script can get stale data after modification.
 
 # Configuration
 
diff --git a/netbox_agent/ethtool.py b/netbox_agent/ethtool.py
index 91522c9..3ce3fbc 100644
--- a/netbox_agent/ethtool.py
+++ b/netbox_agent/ethtool.py
@@ -19,6 +19,12 @@ field_map = {
 }
 
 
+def merge_two_dicts(x, y):
+    z = x.copy()
+    z.update(y)
+    return z
+
+
 class Ethtool():
     """
     This class aims to parse ethtool output
@@ -67,7 +73,6 @@ class Ethtool():
     def parse(self):
         if which('ethtool') is None:
             return None
-        return {
-            **self._parse_ethtool_output(),
-            **self._parse_ethtool_module_output(),
-            }
+        output = self._parse_ethtool_output()
+        output.update(self._parse_ethtool_module_output())
+        return output