diff --git a/integrate_into_manifest.py b/integrate_into_manifest.py
index fe7d688ff9f00455bf0c9edc7cef9975a408de43..7ef8ed9d3f4c8180472e7631b78e824cd079695b 100755
--- a/integrate_into_manifest.py
+++ b/integrate_into_manifest.py
@@ -135,7 +135,7 @@ def integrate_into_manifest(
         # Parse manifest file
         try:
             with open(manifest_filepath.as_posix(), "r", encoding="utf8") as fp:
-                manifest = fp.read_text()
+                manifest = fp.read()
         except FileNotFoundError:
             sys.exit("ERROR: file '%s' not found in manifest repo" % manifest_file)
 
@@ -143,7 +143,7 @@ def integrate_into_manifest(
         if new_manifest is not None:
             # write file
             with open(manifest_filepath.as_posix(), "w", encoding="utf8") as fp:
-                fp.write_text(new_manifest)
+                fp.write(new_manifest)
             manifest_repo.index.add([manifest_file])
         else:
             # Look for project in SRCREV as it has not been found in the manifest
@@ -154,7 +154,7 @@ def integrate_into_manifest(
                 )
 
             with open(srcrev_filepath, "r", encoding="utf8") as fp:
-                srcrev = fp.read_text()
+                srcrev = fp.read()
             new_srcrev = update_srcrev(srcrev, recipe_name, new_revision)
             # write file
             if new_srcrev is None:
@@ -163,7 +163,7 @@ def integrate_into_manifest(
                     "no recipe name is specified" % project.path
                 )
             with open(srcrev_filepath.as_posix(), "w", encoding="utf8") as fp:
-                fp.write_text(new_manifest)
+                fp.write(new_manifest)
             manifest_repo.index.add([srcrev_file])
 
         # Make an API request to create the gitlab.user object