diff -Nru pngoptimizer-2.7/debian/bzr-builder.manifest pngoptimizer-2.7/debian/bzr-builder.manifest
--- pngoptimizer-2.7/debian/bzr-builder.manifest	2021-11-20 15:28:29.000000000 +0000
+++ pngoptimizer-2.7/debian/bzr-builder.manifest	2021-11-20 15:45:54.000000000 +0000
@@ -1,2 +1,2 @@
-# bzr-builder format 0.3 deb-version {debupstream}-0~15
-lp:~psydk/+junk/pngoptimizer-pack revid:hadrien@psydk.org-20211120151608-c5pv2u631wnt9sfi
+# bzr-builder format 0.3 deb-version {debupstream}-0~16
+lp:~psydk/+junk/pngoptimizer-pack revid:hadrien@psydk.org-20211120154343-nszrnpsm75a79bp9
diff -Nru pngoptimizer-2.7/debian/changelog pngoptimizer-2.7/debian/changelog
--- pngoptimizer-2.7/debian/changelog	2021-11-20 15:28:29.000000000 +0000
+++ pngoptimizer-2.7/debian/changelog	2021-11-20 15:45:54.000000000 +0000
@@ -1,8 +1,8 @@
-pngoptimizer (2.7-0~15~ubuntu21.04.1) hirsute; urgency=low
+pngoptimizer (2.7-0~16~ubuntu21.04.1) hirsute; urgency=low
 
   * Auto build.
 
- -- Hadrien <launchpad@psydk.org>  Sat, 20 Nov 2021 15:28:29 +0000
+ -- Hadrien <launchpad@psydk.org>  Sat, 20 Nov 2021 15:45:54 +0000
 
 pngoptimizer (2.7-0ubuntu1) bionic; urgency=medium
 
diff -Nru pngoptimizer-2.7/projects/pngoptimizer/Changelog.txt pngoptimizer-2.7/projects/pngoptimizer/Changelog.txt
--- pngoptimizer-2.7/projects/pngoptimizer/Changelog.txt	2021-11-20 15:28:29.000000000 +0000
+++ pngoptimizer-2.7/projects/pngoptimizer/Changelog.txt	2021-11-20 15:45:54.000000000 +0000
@@ -1,9 +1,10 @@
 == PngOptimizer Changelog ==
 
 -----------------
-2021 (2.7)
+2021-11 (2.7)
 
 - change: ensure the window is fully visible on Windows
+- fixed: bad conversion of palette mode PNGs to grayscale 
 
 -----------------
 2019-07 (2.6.2)
diff -Nru pngoptimizer-2.7/projects/pngoptimizercl/Changelog.txt pngoptimizer-2.7/projects/pngoptimizercl/Changelog.txt
--- pngoptimizer-2.7/projects/pngoptimizercl/Changelog.txt	2021-11-20 15:28:29.000000000 +0000
+++ pngoptimizer-2.7/projects/pngoptimizercl/Changelog.txt	2021-11-20 15:45:54.000000000 +0000
@@ -1,7 +1,9 @@
 == PngOptimizerCL Changelog ==
 
 -----------------
-2020 (2.7)
+2021-11 (2.7)
+
+- fixed: bad conversion of palette mode PNGs to grayscale 
 
 -----------------
 2019-07 (2.6.2)