diff --git a/README.md b/README.md
index 0e3296978fb..53a04ae0ced 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-HDF5 version 2.1.1 released on 2026-03-20
+HDF5 version 2.1.1 released on 2026-03-23
 <div align="center">
 
 ![HDF5 Logo][u3]
diff --git a/release_docs/CHANGELOG.md b/release_docs/CHANGELOG.md
index 72040409490..136513ab20d 100644
--- a/release_docs/CHANGELOG.md
+++ b/release_docs/CHANGELOG.md
@@ -5,6 +5,7 @@ HDF5 version 2.1.1 released on 2026-03-20
 > [!Note]
 >
 > - A typo in variable LT_HL_F_VERS_INTERFACE left H5_HL_F_SOVERS_INTERFACE empty, resulting in malformed macOS linker flags. The typo was fixed in this patch release.
+> - A change in the directory structure of one of the compression filters resulted in undetected failure signing the hdf5-2.1.0-macos14_clang.dmg release binary. This was found and fixed in this patch release.
 
 ---
 HDF5 version 2.1.0 released on 2026-03-02