diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c52639..2bb6e58 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Deprecated
+- Support for Python 2 is dropped at January 1st, 2020 ([#307](https://github.com/pdfminer/pdfminer.six/pull/307))
+
 ### Added
 - Contribution guidelines in [CONTRIBUTING.md](CONTRIBUTING.md) ([#259](https://github.com/pdfminer/pdfminer.six/pull/259))
 - Support new encodings OneByteEncoding and DLIdent for CMaps ([#283](https://github.com/pdfminer/pdfminer.six/pull/283))
diff --git a/pdfminer/__init__.py b/pdfminer/__init__.py
index 01ddba7..6914c22 100644
--- a/pdfminer/__init__.py
+++ b/pdfminer/__init__.py
@@ -10,7 +10,15 @@ It includes a PDF converter that can transform PDF files into other text
 formats (such as HTML). It has an extensible PDF parser that can be used for
 other purposes instead of text analysis.
 """
+import sys
+import warnings
+
 __version__ = '20181108'
 
+
+if sys.version_info < (3, 0):
+    warnings.warn('On January 1st, 2020, pdfminer.six will stop supporting Python 2. Please upgrade to Python 3. For '
+                  'more information see https://github.com/pdfminer/pdfminer.six/issues/194')
+
 if __name__ == '__main__':
     print(__version__)