diff --git a/CHANGES.rst b/CHANGES.rst
index 27736e2..c82583c 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,9 @@
 History
 -------
 
++ **3.1.2 (2024-04-08)**
+    + Fix bug when using Mixture distribution.
+
 + **3.1.1 (2024-04-04)**
     + Add a MixtureDistrubution that probabilistically chooses from a number of other distributions to sample from.
     + Baulking functions now take the simulation, current node, and current individual.
diff --git a/ciw/version.py b/ciw/version.py
index d539d50..911557b 100644
--- a/ciw/version.py
+++ b/ciw/version.py
@@ -1 +1 @@
-__version__ = "3.1.1"
+__version__ = "3.1.2"