diff --git a/Doxyfile b/Doxyfile
index 551755f2..e564ef03 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME = "LibBi"
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER = 1.4.1
+PROJECT_NUMBER = 1.4.2
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
diff --git a/Makefile.PL b/Makefile.PL
index 4c97296b..4120c54b 100755
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -4,7 +4,7 @@ use inc::Module::Install;
 name 'LibBi';
 abstract 'LibBi is used for state-space modelling and Bayesian inference on modern computer hardware, including multi-core CPUs, many-core GPUs (graphics processing units) and distributed-memory clusters.';
 author 'Lawrence Murray <lawrence.murray@csiro.au>';
-version '1.4.1';
+version '1.4.2';
 license 'gpl';
 
 # dependencies
diff --git a/VERSION.md b/VERSION.md
index e1d34bbd..864e3819 100644
--- a/VERSION.md
+++ b/VERSION.md
@@ -1,6 +1,13 @@
 LibBi VERSION.md
 ================
 
+v1.4.2
+------
+
+Performance:
+
+* Improved beta and negative binomial random generators
+
 v1.4.1
 ------
 
diff --git a/docs/pdf/manual.pdf b/docs/pdf/manual.pdf
index 8c8015eb..013c9ffb 100644
Binary files a/docs/pdf/manual.pdf and b/docs/pdf/manual.pdf differ
diff --git a/docs/src/index.tex b/docs/src/index.tex
index cd0d48ec..925ddfb2 100644
--- a/docs/src/index.tex
+++ b/docs/src/index.tex
@@ -108,7 +108,7 @@
 \vspace{6cm}
 
 \fontsize{16pt}{24pt}\selectfont
-Version 1.4.1
+Version 1.4.2
 
 \vspace{1cm}
 
diff --git a/share/configure.ac b/share/configure.ac
index c4cdafb5..8568012b 100644
--- a/share/configure.ac
+++ b/share/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([LibBi], [1.4.1], [bug-report@libbi.org], [libbi], [http://www.libbi.org])
+AC_INIT([LibBi], [1.4.2], [bug-report@libbi.org], [libbi], [http://www.libbi.org])
 AC_PREREQ([2.62])
 AC_LANG([C++])
 AM_INIT_AUTOMAKE([1.10 no-define foreign])