diff --git a/src/packme/PackerTemplate.py b/src/packme/PackerTemplate.py
index 5c10f654f5acaa1dd572d5a8920d4cc2c45a0f68..c2abc51447ff318d3dbdacb8816cb47fed57849f 100644
--- a/src/packme/PackerTemplate.py
+++ b/src/packme/PackerTemplate.py
@@ -18,7 +18,7 @@ class PackerTemplate:
     - processors: a list of dictionaries where each dictionary defines actions to be run after the image is built
     """
 
-    def __init__(self, name: str, yaml_node: yaml.Node, packages: List[str]) -> None:
+    def __init__(self, name: str, yaml_node: dict, packages: List[str]) -> None:
         """Constructor
         """
 
@@ -132,7 +132,7 @@ class PackerTemplate:
                 parent_builder["iso_url"] = "./builds/{}-{}".format(parent_template.name, builder_name)
                 parent_builder["iso_checksum_type"] = "none"
                 parent_builder["iso_checksum_url"] = "none"
-                parent_builder["output_directory"] = os.path.join(self._templates_dir,self._name)
+                parent_builder["output_directory"] = os.path.join(self._templates_dir, self._name)
                 self._builders.insert(0,parent_builder)
 
             # If the builder is also defined in the child config, use the child config one and specify the image dependency
@@ -181,8 +181,8 @@ class PackerTemplate:
             except FileNotFoundError:
                 manifest_data = []
             else:
-                manifest_data = yaml.safe_load(fin)
-                manifest_data = manifest_data["provisioners"]
+                root_node = yaml.safe_load(fin)
+                manifest_data = root_node["provisioners"]
 
             # Loop over the provisioners list and update when necessary relative paths with absolute one for packer to run correctly
             for provisioner in manifest_data:
diff --git a/src/packme/Packman.py b/src/packme/Packman.py
index 7724539f56479cd10128dcbeadb2b32ef751a9be..29cf367ac048e1d49eadd6c6dc9899eed8898a22 100644
--- a/src/packme/Packman.py
+++ b/src/packme/Packman.py
@@ -4,7 +4,7 @@ import shutil
 import subprocess
 import yaml
 
-from typing import List, Optional
+from typing import Any, Dict, List, Optional
 
 from .PackerTemplate import PackerTemplate
 
@@ -167,7 +167,7 @@ class Packman:
 
         templates = self.get_templates_selection(selected_templates)
 
-        config_hierarchy = []
+        config_hierarchy : List[str] = []
         for template in templates:
             self._build_template_hierarchy(template, config_hierarchy)