diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog for `monatone`
 
+## [0.2.1.1] - 2025-12-10
+
+### Fixed
+- Added *.m4a to extra-source-files to include M4A test fixture in sdist tarball
+
 ## [0.2.1.0] - 2025-12-10
 
 ### Fixed
diff --git a/monatone.cabal b/monatone.cabal
--- a/monatone.cabal
+++ b/monatone.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.4
 name:            monatone
-version:         0.2.1.0
+version:         0.2.1.1
 synopsis:        Pure Haskell library for audio metadata parsing and writing
 description:
   Monatone is a pure Haskell library for parsing and writing
@@ -29,6 +29,7 @@
                  README.md
                  test/fixtures/*.mp3
                  test/fixtures/*.flac
+                 test/fixtures/*.m4a
 extra-doc-files:
                  CHANGELOG.md
 
diff --git a/test/fixtures/minimal.m4a b/test/fixtures/minimal.m4a
new file mode 100644
Binary files /dev/null and b/test/fixtures/minimal.m4a differ