diff --git a/cps/uploader.py b/cps/uploader.py
index f238b89d..992d188c 100644
--- a/cps/uploader.py
+++ b/cps/uploader.py
@@ -233,7 +233,10 @@ def pdf_meta(tmp_file_path, original_file_name, original_file_extension):
         if subject == '':
             subject = doc_info.subject
         if tags == '' and '/Keywords' in doc_info:
-            tags = doc_info['/Keywords']
+            if isinstance(doc_info['/Keywords'], bytes):
+                tags = doc_info['/Keywords'].decode('utf-8')
+            else:
+                tags = doc_info['/Keywords']
     else:
         title = original_file_name
 
diff --git a/optional-requirements.txt b/optional-requirements.txt
index e13f32f5..5de006fe 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -38,7 +38,7 @@ beautifulsoup4>=4.0.1,<4.2.0
 cchardet>=2.0.0,<2.2.0
 
 # Comics
-natsort>=2.2.0,<8.1.0
+natsort>=2.2.0,<8.2.0
 comicapi>=2.2.0,<2.3.0
 
 # Kobo integration
diff --git a/setup.cfg b/setup.cfg
index e6b61e9d..5053d19f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -92,7 +92,7 @@ metadata =
 	beautifulsoup4>=4.0.1,<4.2.0
 	cchardet>=2.0.0,<2.2.0
 comics = 
-	natsort>=2.2.0,<8.1.0
+	natsort>=2.2.0,<8.2.0
 	comicapi>=2.2.0,<2.3.0
 kobo = 
 	jsonschema>=3.2.0,<4.5.0