diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3610035..a387cac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,9 +9,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `clear_png_metadata` function in `functions.py`
 - `extract_metadata` function in `functions.py`
 ### Changed
+- `clear` function in `functions.py`
+- `update` function in `functions.py`
 - Test system modified
 - `README.md` updated
-
 ## [0.4] - 2025-06-16
 ### Added
 - `Acknowledgments` in `README.md`
diff --git a/dmeta/functions.py b/dmeta/functions.py
index 2a4c448..26bf821 100644
--- a/dmeta/functions.py
+++ b/dmeta/functions.py
@@ -88,7 +88,7 @@ def is_metadata_cleared(xml_path, is_core=True):
     modified = microsoft_file_name
     if not in_place:
         modified = microsoft_file_name[:microsoft_file_name.rfind('.')] + "_cleared" + "." + microsoft_format
-    with zipfile.ZipFile(modified, "w") as file:
+    with zipfile.ZipFile(modified, "w", compression=zipfile.ZIP_DEFLATED) as file:
         for file_name in source_file.namelist():
             file.write(os.path.join(unzipped_dir, file_name), file_name)
         file.close()
@@ -194,7 +194,7 @@ def is_metadata_up_to_date(xml_path, metadata, is_core=True):
     modified = microsoft_file_name
     if not in_place:
         modified = microsoft_file_name[:microsoft_file_name.rfind('.')] + "_updated" + "." + microsoft_format
-    with zipfile.ZipFile(modified, "w") as file:
+    with zipfile.ZipFile(modified, "w", compression=zipfile.ZIP_DEFLATED) as file:
         for file_name in source_file.namelist():
             file.write(os.path.join(unzipped_dir, file_name), file_name)
         file.close()