diff --git a/CHANGES.md b/CHANGES.md
index 2fa568a7..4fcead0a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,48 @@
-# CHANGES - libppd v2.0.0 - 2023-09-22
+# CHANGES - libppd v2.1b1 - 2024-08-14
+
+## CHANGES IN V2.1b1 (14th August 2024)
+
+- Added support for libcups3 (libcups of CUPS 3.x)
+  With these changes libcupsfilters can be built either with libcups2
+  (libcups of CUPS 2.x) or libcups3 (libcups of CUPS 3.x). Pull
+  request #27.
+
+- Prefer PDF again in PPDs for driverless printers
+  PDF works better with finishing, especially combinations of multiple
+  copies, collation, and stapling/binding (Issue #42, Pull request
+  #44).
+
+- Use 0.5mm as tolerance when comparing page sizes
+  For the PWG two page sizes are considered the same when the
+  dimensions differ no more than 0.5 mm, libppd used too tight
+  tolerances (Issue #29, Pull request #46).
+
+- PPD generator: Check for required attributes when choosing input format
+  Check for PCLm and PWG the minimum of attributes which we require
+  during PPD generation. (Pull request #39, #40, [Fedora issue](https://bugzilla.redhat.com/show_bug.cgi?id=2263053)).
+
+- `ppdLoadAttributes()`: Improve check whether parameters are integer
+  (Pull request #38)
+
+- `ppdLoadAttributes()`: Fix crash when page size could not get determined
+  (Issue #31, Pull request #37)
+
+- Fix crash if there is no page size for "Custom"
+  (Pull request #35, [CUPS issue #849](https://github.com/OpenPrinting/cups/issues/849))
+
+- Fix crash when incoming `*ptr` is NULL
+  (Pull request #28, same as OpenPrinting/cups#831)
+
+- libcups2 compatibility: Use proper CUPS array callback function types
+  Fixed CUPS array function call in libcups2 compatibility layer (Pull
+  request #33)
+
+- Build system: Fix failure to correctly link to zlib
+  Look up zlib properly with pkg-config (Pull request #32)
+
+- Convert `INSTALL` to `INSTALL.md`
+  (Pull request #34)
+
 
 ## CHANGES IN V2.0.0 (22th September 2023)
 
diff --git a/INSTALL.md b/INSTALL.md
index 641742f7..e636a4a8 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -1,4 +1,4 @@
-# OpenPrinting libppd v2.0.0 Installation Guide
+# OpenPrinting libppd v2.1b1 Installation Guide
 
 
 ## Overview
diff --git a/README.md b/README.md
index 046d9691..7877b200 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# OpenPrinting libppd v2.0.0 - 2023-09-22
+# OpenPrinting libppd v2.1b1 - 2024-08-14
 
 Looking for compile instructions? Read the file "INSTALL"
 instead...
diff --git a/configure.ac b/configure.ac
index 7d8a459b..dc15c6d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ AC_PREREQ([2.65])
 # ====================
 # Version informations
 # ====================
-AC_INIT([libppd], [2.0.0], [https://github.com/OpenPrinting/libppd/issues], [libppd], [https://github.com/OpenPrinting/libppd/])
+AC_INIT([libppd], [2.1b1], [https://github.com/OpenPrinting/libppd/issues], [libppd], [https://github.com/OpenPrinting/libppd/])
 libppd_version="AC_PACKAGE_VERSION"
 libppd_version_major="`echo AC_PACKAGE_VERSION | awk -F. '{print $1}'`"
 libppd_version_major="`echo AC_PACKAGE_VERSION | awk -F. '{printf("%d\n",$2);}'`"