diff --git a/.github/workflows/linters.yaml b/.github/workflows/linters.yaml
index 92c165f1..f69c8959 100644
--- a/.github/workflows/linters.yaml
+++ b/.github/workflows/linters.yaml
@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [ "3.8" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
 
     steps:
       - uses: actions/checkout@v3
@@ -46,7 +46,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [ "3.8" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.github/workflows/unittests.yaml b/.github/workflows/unittests.yaml
index b7cd8934..bee62848 100644
--- a/.github/workflows/unittests.yaml
+++ b/.github/workflows/unittests.yaml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.pylintrc b/.pylintrc
index b65ede8a..64c48ba1 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -64,7 +64,12 @@ disable=I,
         useless-import-alias,  # nice to have
         useless-super-delegation,  # nice to have
         wrong-import-order,
-        wrong-import-position
+        wrong-import-position,
+        use-implicit-booleaness-not-comparison-to-zero,
+        use-implicit-booleaness-not-comparison-to-string,
+        unspecified-encoding,
+        broad-exception-raised,
+        consider-using-f-string
 
 [REPORTS]
 
diff --git a/README.md b/README.md
index d52a4506..c0cb8377 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ future. And Ronda service will be hosted in AWS S3.
 
 ## Prerequisites
 
-* python 3.5+
+* python 3.9+
 * git
 
 ### [Optional] Install AWS CLI tool
diff --git a/charon/pkgs/indexing.py b/charon/pkgs/indexing.py
index db7a8fb9..6d9c8d42 100644
--- a/charon/pkgs/indexing.py
+++ b/charon/pkgs/indexing.py
@@ -55,11 +55,13 @@ def __init__(self, title: str, header: str, items: Set[str]):
         self.items = items
 
     def generate_index_file_content(self, package_type: str) -> str:
+        template = None
         if package_type == PACKAGE_TYPE_MAVEN:
             template = Template(MAVEN_INDEX_TEMPLATE)
         elif package_type == PACKAGE_TYPE_NPM:
             template = Template(NPM_INDEX_TEMPLATE)
-        return template.render(index=self)
+        if template:
+            return template.render(index=self)
 
 
 def generate_indexes(
diff --git a/charon/pkgs/npm.py b/charon/pkgs/npm.py
index 3c183aac..2fd6bee3 100644
--- a/charon/pkgs/npm.py
+++ b/charon/pkgs/npm.py
@@ -485,6 +485,7 @@ def _scan_metadata_paths_from_archive(
             path=path, target_dir=tmp_root, is_for_upload=True,
             pkg_root=pkg_root, registry=registry
         )
+        package = None
         if len(valid_paths) > 1:
             version = _scan_for_version(valid_paths[1])
             package = NPMPackageMetadata(version, True)
diff --git a/tox.ini b/tox.ini
index 218f0a61..55e71059 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ deps = -r requirements-dev.txt
 commands = python3 -m pytest --cov=charon {posargs:"tests"}
 
 [testenv:pylint]
-deps = pylint==2.9.6
+deps = pylint>=2.9.6
 commands = python3 -m pylint charon tests
 
 [testenv:flake8]