diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index 043894ec..5c7f90f5 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -6,6 +6,14 @@ Please always read this file before installing the package
 Download software here: https://github.com/jbarlow83/OCRmyPDF/tags
 
 
+v3.1.1:
+
+Changes
+-------
+
+-  Fixed bug that caused incorrect page size and DPI calculations on documents with mixed page sizes
+
+
 v3.1:
 =====
 
diff --git a/ocrmypdf/main.py b/ocrmypdf/main.py
index 5a355588..75b8fe8c 100755
--- a/ocrmypdf/main.py
+++ b/ocrmypdf/main.py
@@ -39,7 +39,7 @@ warnings.simplefilter('ignore', pypdf.utils.PdfReadWarning)
 
 
 BASEDIR = os.path.dirname(os.path.realpath(__file__))
-VERSION = '3.1'
+VERSION = '3.1.1'
 
 
 # -------------
diff --git a/setup.py b/setup.py
index a15d3908..fd8d2462 100644
--- a/setup.py
+++ b/setup.py
@@ -184,7 +184,7 @@ tests_require = open('test_requirements.txt').read().splitlines()
 
 setup(
     name='ocrmypdf',
-    version='3.1',  # also update: release notes, main.py
+    version='3.1.1',  # also update: release notes, main.py
     description='OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched',
     url='https://github.com/jbarlow83/OCRmyPDF',
     author='James R. Barlow',