diff --git a/CMakeLists.txt b/CMakeLists.txt
index f07e55a0..f8146ef7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
cmake_minimum_required( VERSION 3.3.2 )
project(exiv2 # use TWEAK to categorize the build
- VERSION 0.27.4.10 # 0.27.4 = GM (tagged and released)
+ VERSION 0.27.4.1 # 0.27.4 = GM (tagged and released)
# 0.27.4.9 = 27.4.9 Development
# 0.27.4.00 = GM Preview
# 0.27.4.2 = RC2 (tagged and released)
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 2f8f16c6..f4ef5ce5 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,112 @@
+Changes from version 0.27.3 to 0.27.4
+-------------------------------------
+
+Closed:
+https://github.com/Exiv2/exiv2/milestone/6?closed=1
+
+Open:
+https://github.com/Exiv2/exiv2/milestone/6?open=1
+
+Release Notes:
+https://github.com/Exiv2/exiv2/issues/1018#issuecomment-757979745
+
+Bugs/Fixes
+----------
+
+| Group | PR | Topic | Issue |
+|:--------------|:-------|:-------------------------------------------|:-------|
+| Bugs & | #1475 | **bmff** Base Media File Format | #1229 |
+| Fixes | #1490 | | #1489 |
+| | #1493 | v0.27.4 application tests | |
+| | #1486 | Empty Exif Ascii handling | #1484 |
+| | #1482 | Issues with LangAlt command-line parsing | #1481 |
+| | #1480 | DNG 1.6 triple-illuminant calibration tags | |
+| | #1469 | Sony 2010e tag support | #1464 |
+| | #1472 | | #1471 |
+| | #1461 | cppcheck detected performance issues | #1459 |
+| | #1444 | Fix comment typo is xmpprint.cpp | |
+| | #1442 | Test Nikon LensData v8 handler | #1437 |
+| | | | #1433 |
+| | #1432 | Binary output handling | #1431 |
+| | #1436 | DNG 1.6 Support | |
+| | #1427 | prettyPrint Planar Config | |
+| | #1425 | fix some Nikon MarkerNote short/long tags | |
+| | #1412 | DNG 1.5 Support | |
+| | #1411 | Fix Fuji tag type | #1344 |
+| | #1410 | bump revision 0.27.4.9 | |
+| | #1409 | Support hidden embedded TIF in RAF | #1402 |
+| | #1407 | Support Fuji CropMode | |
+| | #1399 | Sony Lens aberration correction parameters | |
+| | #1392 | DNG 1.3 | #1393 |
+| | #1391 | DNG Changes | |
+| | #1389 | Exif 2.32 Support | #929 |
+| | #1384 | Disable exiv2 option --binary | |
+| | #1386 | Adding more easy accessors | #1385 |
+| | | | #1054 |
+| | #1360 | base64 decode fixes | #1358 |
+| | #1342 | PSD fixes | #1261 |
+| | #1331 | Remove BigTiff Support | #1329 |
+| | #1330 | formatString fixes | #1328 |
+| | #1314 | ASAN issues with RemoteIo | #1307 |
+| | #1313 | crwtest fixes | #1297 |
+| Security | #1483 | Define Security Policy | #1122 |
+| Lens | #1375 | Olympus M.Zuiko Digital ED 17mm F1.2 Pro | |
+| | #1373 | Sigma 18-35mm f/1.8 DC HSM | |
+| Build | #1496 | Exiv2 v0.27.4 RC1 | |
+| | #1452 | Building on windows/msys2 | #1449 |
+| | #1439 | Fix PACKAGE_URL and PROJECT_DESCRIPTION | |
+| | #1434 | CI build MinGW/msys2 and Cygwin | |
+| | #1367 | CI changes for Linux | |
+| | #1356 | MinGW/msys2 toolchain changes | #1353 |
+| | #1339 | Cygwin Stack Protection | |
+| | #1336
#1349
#1340 | Winsock2 include changes | #1335 |
+| | #1309
#1311 | Remove EXV_HAVE_STDINT_H check | |
+| | #1290 | Solaris Stack Protection | |
+| | #1277 | Remove cmake -DEXIV2_BUILD_PO option | #1276 |
+| | #1275 | GNUInstallDirs changes | |
+| | #1271 | Correctly setting -fstack-protector-strong | #1252 |
+| | #1245 | More compiler flag settings | #1243 |
+| | #1268 | Fix GPSProcessingMethod handling | #1266 |
+| | #1260 | Writing PSD Files | |
+| | #1253 | Disable libiconv/Visual Studio/CMake | |
+| Test | #1477 | Fix exiv2-test.sh output if test/tmp empty | #1477 |
+| | #1372 | Support env EXIV2 strings in python tests | |
+| | #1371 | Test NLS Support | #1278 |
+| | #1333 | Test stdin | |
+| | #1257 | Rewrite bash test script in Python | #1215 |
+| | #1289 | Remove env EXIV2_EXT | |
+| | #1372 | Support env EXIV2 strings in python tests | |
+| | #1495 | Remove test dependency on make and bash | #1274 |
+| | Various| Rewrite bash scripts in python3 | #1215 |
+| Localisation | #1435 | ES Translation | |
+| Documentation | #1440 | Fix typo in cmd64.bat in Documentation | |
+| | #1414 | Web-site issues | |
+| | #1403 | Visual Studio 2019 buildnotes | #1394 |
+| | #1400 | IPTC tag corrections on web-site | #1393 |
+| | #1387 | Fix man page typos concerning CanonFi | |
+| Withdrawn | | Discussion FLIR Camera Support | #1479 |
+| No action | | Sigma 60-600mm f/4.5-6.3 DG OS HMS | Sport | #1478 |
+| | #1474 | Withdrawn PRs concerning bmff | #1229 |
+| | #1458 | | |
+| | | Nikon d780 + Tamron 85mm 1.8 VC | #1468 |
+| | | Exif.Photo.DateTimeOriginal discussion | #1467 |
+| | | Question about sidecar files | #1465 |
+| | | asfvideo.cpp null pointer dereference | #1463 |
+| | | Multi-Page TIFF Support | #1460 |
+| | | Lumix G 20mm F1.7 II Asph. | #1441 |
+| | | Canon Lenses | #1429 |
+| | | CMake issues with Xcode 12.2 -G Xcode | #1408 |
+| | #1286 | Exiv2::XmpProperties::propertyList() | #1206 |
+| | #1226 | XMP false report | #1223 |
+| | | API Compatibility Test | #890 |
+| Team | | Future of Exiv2 | #1466 |
+| Discussion | | Project Status | #1462 |
+| | | Open Invention Network | #1447 |
+
+Robin Mills
+robin@clanmills.com
+2021-03-18
+
Changes from version 0.27.2 to 0.27.3
-------------------------------------
diff --git a/releasenotes/releasenotes.txt b/releasenotes/releasenotes.txt
index ec57e161..eaf64b0c 100644
--- a/releasenotes/releasenotes.txt
+++ b/releasenotes/releasenotes.txt
@@ -1,5 +1,72 @@
@RV@ @RC@
+Headline Features of Exiv2 v0.27.4
+----------------------------------
+
+Dedicated to the memory of our beautiful cat Lizzie who was put to sleep on 2021-02-13.
+
+Thank You to the following who have contributed to this release.
+
+| Contributor | Activity |
+|:-------------|:--------------------------------------------------|
+| Alex | Project Management |
+| Arnold | Keeps me honest! |
+| Christoph | Nikon and Canon Support |
+| David | Help with legal investigation concerning bmff |
+| Freddie | Fuji support |
+| Leo | New python test scripts |
+| Milos | DNG, easyaccess support |
+| Peter K | bmff code |
+| Peter S | langAltValue.read() fix and helpful issue reports |
+
+1) Bug and security fixes:
+ - bmff support (.CR3, .HEIC and .AVIF).
+ - Security process is defined.
+ https://github.com/Exiv2/exiv2/security/policy.
+ - DNG 1.6 and Exif 2.32 support.
+ - More easyaccess APIs and documentation.
+ - Updated Catalan localisation.
+
+2) Changes to downloadable build bundles:
+ - Revised documentation and man page.
+ - MinGW/msys2 bundle built with C++11 (for Qt users).
+
+3) Build and Test:
+ - Test suite is implemented in python.
+ - Support for building on ARM (raspberry pi).
+ - Localisation is tesed.
+
+4) Book "Image Metadata and Exiv2 Architecture".
+ - https://clanmills.com/exiv2/book/
+ - https://clanmills.com/exiv2/book/IMaEA.pdf
+
+Detailed Change List since 0.27.3
+---------------------------------
+
+https://github.com/Exiv2/exiv2/issues/1018#issuecomment-757979745
+
+Future Releases
+---------------
+
+We have about 8 regular contributors.
+About 100 folks have contributed since 2004.
+We will always welcome new contributors to work on any aspect of the code and projects.
+
+I celebrated my 70th birthday in January and want to retire.
+
+The project status is tracked here: https://github.com/Exiv2/exiv2/issues/1462
+
+Exiv2 v0.27.4 is likely to be the final "dot" of the Exiv2 v0.27 product family.
+
+Development will now move to branch 'main'.
+We plan to port the unique_ptr from branch 'old-master' and ship 'main' as 0.28 in September 2021.
+
+We are incubating Exiv2 into KDE: https://community.kde.org/Incubator/Projects/Exiv2
+
+Robin Mills
+robin@clanmills.com
+2020-03-18
+
Headline Features of Exiv2 v0.27.3
----------------------------------