diff --git a/README.md b/README.md
index 8d72533d7..9862da325 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,9 @@ The detailed description can be found
 
 ## Changes
 
+### 2.1.20
+- Fix sig letters for mean differences
+
 ### 2.1.19
 - Fix pairwise bug (with empty indices)
 
diff --git a/src/cr/cube/__init__.py b/src/cr/cube/__init__.py
index db6c06acf..533779cb9 100644
--- a/src/cr/cube/__init__.py
+++ b/src/cr/cube/__init__.py
@@ -2,4 +2,4 @@
 
 """Initialization module for crunch-cube package."""
 
-__version__ = "2.1.19"
+__version__ = "2.1.20"