diff --git a/README.md b/README.md
index d31f1d69e..406df2786 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ Import the `galois` package in Python.
 In [1]: import galois
 
 In [2]: galois.__version__
-Out[2]: '0.3.8'
+Out[2]: '0.3.9'
 ```
 
 ### Create a [`FieldArray`](https://mhostetter.github.io/galois/latest/api/galois.FieldArray/) subclass
diff --git a/docs/release-notes/v0.3.md b/docs/release-notes/v0.3.md
index 16878a1d4..6c6e7401d 100644
--- a/docs/release-notes/v0.3.md
+++ b/docs/release-notes/v0.3.md
@@ -293,3 +293,17 @@ tocdepth: 2
 ### Contributors
 
 - Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
+## v0.3.9
+
+*Released June 10, 2024*
+
+### Changes
+
+- Added support for `python -OO` optimization. ([#545](https://github.com/mhostetter/galois/pull/545))
+- Improved documentation in minor ways.
+
+### Contributors
+
+- Justin Charlong ([@jcharlong](https://github.com/jcharlong))
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))