diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7734cd4..df6e4d0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
     runs-on: ${{ matrix.os }}
     steps:
@@ -25,7 +25,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install Poetry
-      uses: snok/install-poetry@v1
+      uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a
       with:
         virtualenvs-create: true
         virtualenvs-in-project: true
diff --git a/codestripper/utils/comments.py b/codestripper/utils/comments.py
index 16c328b..f976f1d 100644
--- a/codestripper/utils/comments.py
+++ b/codestripper/utils/comments.py
@@ -22,5 +22,8 @@ class Comment:
     ".r": Comment("#"),
     ".py": Comment("#"),
     ".ps1": Comment("#"),
-    ".rb": Comment("#")
+    ".rb": Comment("#"),
+    ".yml": Comment("#"),
+    ".yaml": Comment("#"),
+    "": Comment("#"),  # Default comment style for unknown file types
 }
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 842aa52..5cdbd09 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "codestripper"
-version = "1.1.1"
+version = "1.1.2"
 description = "CodeStripper used to strip code from assignments"
 authors = ["Bonajo <m.bonajo@fontys.nl>"]
 maintainers = ["Bonajo <m.bonajo@fontys.nl>"]