diff --git a/3rdparty/utfcpp b/3rdparty/utfcpp
index 63d64de4..819011bb 160000
--- a/3rdparty/utfcpp
+++ b/3rdparty/utfcpp
@@ -1 +1 @@
-Subproject commit 63d64de49fd6b829f7c8694df5ab2ee625cb7134
+Subproject commit 819011bb01628fe1aa2f1da9f2c842a48fd5680b
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98c0db8e..bf893df6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,21 @@
+TagLib 2.3.1 (Jul 20, 2026)
+===========================
+
+ * Matroska: Fix crash when seek head is invalid or missing.
+ * Matroska: Check element length, support unknown size length, skip invalid
+   elements.
+ * Matroska: Allow Chapters without a ChapterUID.
+ * Fix data length indicator check for compressed ID3v2 frames.
+ * MP4: Use `LongLong` instead of `UInt` for `cnID` atom to support large
+   catalog IDs.
+ * MP4: Fix destructor and assignment operator for `MP4::Chapter`.
+ * MP4: Let `hasiXMLData()`, `hasBEXTData()` track on-disk state rather than
+   in-memory state.
+ * MP4: Support NI STEM atoms with 64-bit length.
+ * MP4: Enlarge limit number of MP4 atoms at top level.
+ * MP4: Avoid excessive sample allocations with invalid `stsc` for QT chapters.
+ * XM: Correctly save XM tracker files with samples.
+
 TagLib 2.3 (May 10, 2026)
 =========================