diff --git a/gtfparse/__init__.py b/gtfparse/__init__.py
index fc393c4..4d3af86 100644
--- a/gtfparse/__init__.py
+++ b/gtfparse/__init__.py
@@ -19,7 +19,7 @@
 from .parsing_error import ParsingError
 from .read_gtf import read_gtf_as_dataframe, read_gtf_as_dict
 
-__version__ = "0.1.0"
+__version__ = "0.2.0"
 
 __all__ = [
     "expand_attribute_strings",
diff --git a/gtfparse/attribute_parsing.py b/gtfparse/attribute_parsing.py
index b07115c..1cd0c6b 100644
--- a/gtfparse/attribute_parsing.py
+++ b/gtfparse/attribute_parsing.py
@@ -101,7 +101,15 @@ def expand_attribute_strings(
             value = intern(str(value))
             value_interned_strings[value] = value
 
-        column[i] = value
+        # if an attribute is used repeatedly then
+        # keep track of all its values in a list
+        current_row = column[i]
+        if current_row == missing_value:
+            column[i] = value
+        elif type(current_row) is list:
+            current_row.append(value)
+        else:
+            column[i] = [value]
 
     logging.debug(
         "Memory usage after expanding GTF attributes: %0.4f MB" % (