diff --git a/gns3server/agent/gns3_copilot/skills/loader.py b/gns3server/agent/gns3_copilot/skills/loader.py
index 0295e2520..aaad14e51 100644
--- a/gns3server/agent/gns3_copilot/skills/loader.py
+++ b/gns3server/agent/gns3_copilot/skills/loader.py
@@ -278,7 +278,7 @@ class SkillsLoader:
             return ""
 
         try:
-            with open(prompt_file, "r", encoding="utf-8") as f:
+            with open(prompt_file, encoding="utf-8") as f:
                 content = f.read()
             logger.debug(f"Loaded prompt: {prompt_name} from {prompt_file}")
             return content
@@ -302,7 +302,7 @@ class SkillsLoader:
 
         try:
             commands = []
-            with open(config_file, "r", encoding="utf-8") as f:
+            with open(config_file, encoding="utf-8") as f:
                 for line in f:
                     line = line.strip()
                     if not line or line.startswith("#"):
@@ -364,7 +364,7 @@ class SkillsLoader:
         Returns:
             Parsed YAML content as dictionary, or empty dict if file is empty
         """
-        with open(file_path, "r", encoding="utf-8") as f:
+        with open(file_path, encoding="utf-8") as f:
             data = yaml.safe_load(f)
         if not isinstance(data, dict):
             logger.warning(f"YAML file {file_path} is empty or has invalid format")
diff --git a/gns3server/compute/vmware/__init__.py b/gns3server/compute/vmware/__init__.py
index 03119d214..c814fc55f 100644
--- a/gns3server/compute/vmware/__init__.py
+++ b/gns3server/compute/vmware/__init__.py
@@ -237,7 +237,7 @@ class VMware(BaseManager):
                         vmnet = f"vmnet{match.group(1)}"
                         if vmnet not in ("vmnet0", "vmnet1", "vmnet8"):
                             vmnet_interfaces[vmnet] = {}
-            with open(vmware_networking_file, "r", encoding="utf-8") as f:
+            with open(vmware_networking_file, encoding="utf-8") as f:
                 for line in f.read().splitlines():
                     match = re.search(r"VNET_([0-9]+)_HOSTONLY_SUBNET\s+(.*)", line)
                     if match:
diff --git a/gns3server/utils/uninstall_ai_features.py b/gns3server/utils/uninstall_ai_features.py
index 141ff9ce7..8a1106bca 100644
--- a/gns3server/utils/uninstall_ai_features.py
+++ b/gns3server/utils/uninstall_ai_features.py
@@ -25,7 +25,7 @@ def _read_requirements(filename):
     base_dir = _find_base_dir()
     filepath = os.path.join(base_dir, filename)
     packages = []
-    with open(filepath, "r") as f:
+    with open(filepath) as f:
         for line in f:
             line = line.strip()
             if not line or line.startswith("#"):
diff --git a/tests/controller/gns3vm/test_vmware_gns3_vm.py b/tests/controller/gns3vm/test_vmware_gns3_vm.py
index 89d551e75..1ed1dce54 100644
--- a/tests/controller/gns3vm/test_vmware_gns3_vm.py
+++ b/tests/controller/gns3vm/test_vmware_gns3_vm.py
@@ -46,7 +46,7 @@ async def test_set_extra_options(gns3vm, vmx_path, windows_platform):
 
     await gns3vm._set_extra_options()
 
-    with open(vmx_path, "r") as f:
+    with open(vmx_path) as f:
         assert f.read() == 'vhv.enable = "TRUE"\n'
 
     # when there is an entry, we don't modify it
@@ -55,5 +55,5 @@ async def test_set_extra_options(gns3vm, vmx_path, windows_platform):
 
     await gns3vm._set_extra_options()
 
-    with open(vmx_path, "r") as f:
+    with open(vmx_path) as f:
         assert f.read() == 'vhv.enable = "FALSE"\n'