diff --git a/README.md b/README.md
index 08bdc8825..05f8bdab4 100644
--- a/README.md
+++ b/README.md
@@ -88,6 +88,10 @@ Please visit https://crunch-cube.readthedocs.io/en/latest for the API reference.
 
 ## Changes
 
+### 3.1.1
+
+- Bug fix for subtotal diff (wave difference) for categorical date dimensions
+
 ### 3.1.0
 
 - Subtotal diff (wave difference) for categorical date dimensions
diff --git a/src/cr/cube/__init__.py b/src/cr/cube/__init__.py
index c1631eaeb..608628a57 100644
--- a/src/cr/cube/__init__.py
+++ b/src/cr/cube/__init__.py
@@ -2,4 +2,4 @@
 
 """Initialization module for crunch-cube package."""
 
-__version__ = "3.1.0"
+__version__ = "3.1.1"