diff --git a/c-blosc b/c-blosc
index b886c119..616f4b73 160000
--- a/c-blosc
+++ b/c-blosc
@@ -1 +1 @@
-Subproject commit b886c1191e86a5a561e63fb7345ff6c2b283cdac
+Subproject commit 616f4b7343a8479f7e71dd3d7025bd92c9a6bbd0
diff --git a/docs/release.rst b/docs/release.rst
index 96c90bb0..434c811f 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -22,6 +22,9 @@ Breaking changes
 Enhancements
 ~~~~~~~~~~~~
 
+* Update bundled c-blosc to v1.26.1. This updates Zlib to v1.3.1
+  and Zstd to v1.5.6.
+  By :user:`David Stansby <dstansby>`, :issue:`560`.
 
 Fix
 ~~~