diff --git a/src/mkslides_reveal/config.py b/src/mkslides_reveal/config.py
index 54bab68..ce2609e 100644
--- a/src/mkslides_reveal/config.py
+++ b/src/mkslides_reveal/config.py
@@ -67,7 +67,7 @@ def get_plugins(self) -> list | None:
         return self.__get("plugins")
 
     def merge_config_from_file(self, config_path: Path) -> None:
-        with config_path.open() as f:
+        with config_path.open(encoding="utf-8-sig") as f:
             new_config = yaml.safe_load(f)
 
             self.__config = self.__recursive_merge(self.__config, new_config)
diff --git a/src/mkslides_reveal/constants.py b/src/mkslides_reveal/constants.py
index 35edb14..d5c6bc4 100644
--- a/src/mkslides_reveal/constants.py
+++ b/src/mkslides_reveal/constants.py
@@ -71,9 +71,11 @@
 VERSION = metadata.version("mkslides_reveal")
 
 REVEALJS_VERSION = None
-with REVEALJS_RESOURCE.joinpath("package.json").open() as f:
+with REVEALJS_RESOURCE.joinpath("package.json").open(encoding="utf-8-sig") as f:
     REVEALJS_VERSION = json.load(f)["version"]
 
 HIGHLIGHTJS_THEMES_VERSION = None
-with HIGHLIGHTJS_RESOURCE.joinpath("build", "package.json").open() as f:
+with HIGHLIGHTJS_RESOURCE.joinpath("build", "package.json").open(
+    encoding="utf-8-sig"
+) as f:
     HIGHLIGHTJS_THEMES_VERSION = json.load(f)["version"]
diff --git a/src/mkslides_reveal/markupgenerator.py b/src/mkslides_reveal/markupgenerator.py
index e57f56a..2f15709 100644
--- a/src/mkslides_reveal/markupgenerator.py
+++ b/src/mkslides_reveal/markupgenerator.py
@@ -103,7 +103,7 @@ def __process_markdown_file(
 
         # Retrieve the frontmatter metadata and the markdown content
 
-        content = md_file.read_text()
+        content = md_file.read_text(encoding="utf-8-sig")
         metadata, markdown = frontmatter.parse(content)
 
         # Get the relative path of reveal.js