diff --git a/doc/changes.rst b/doc/changes.rst
index a0426af..2646d7f 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -2,10 +2,11 @@
 Release Notes
 =============
 
-0.5.1 (unreleased)
+0.5.1 (2019-08-20)
 ------------------
 
-* Unused patterns no longer trigger a critical error (PR `#12`_).
+* Unused patterns and over-large backup files
+  no longer trigger a critical error (PR `#12`_).
 
 .. _`#12`: https://github.com/weaverba137/hpsspy/pull/12
 
diff --git a/hpsspy/__init__.py b/hpsspy/__init__.py
index d052323..35cfae2 100644
--- a/hpsspy/__init__.py
+++ b/hpsspy/__init__.py
@@ -20,4 +20,4 @@ class HpssOSError(HpssError):
     pass
 
 
-__version__ = '0.5.1.dev275'
+__version__ = '0.5.1'