diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 9065ec8..56f3378 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,9 @@
-`Unreleased <https://github.com/pace-neutrons/horace-euphonic-interface/compare/v0.3.0...HEAD>`_
+`Unreleased <https://github.com/pace-neutrons/horace-euphonic-interface/compare/v0.3.1...HEAD>`_
 ----------
 
+`v0.3.1 <https://github.com/pace-neutrons/horace-euphonic-interface/compare/v0.3.0...v0.3.1>`_
+------
+
 - Improvements:
 
   - There is a new ``frequency_scale`` argument to ``horace_disp`` which
diff --git a/euphonic_sqw_models b/euphonic_sqw_models
index 0e2c73e..a821159 160000
--- a/euphonic_sqw_models
+++ b/euphonic_sqw_models
@@ -1 +1 @@
-Subproject commit 0e2c73ec395c5ca7e2a920f88b6d45798fadc0cf
+Subproject commit a8211599608e5272b608e4695eec50b4fc0d643d