diff --git a/changes.txt b/changes.txt
index 5b26160..4f86bb9 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,3 +1,9 @@
+April 4th, 2017
+v0.13.1
+     -- Fix missing fp_rand symbol in shared library
+     -- Fix some parameters in API signatures that should've been const
+     -- Bugfixes and improvements contributed by Sebastian Siewior, Reiner Herrmann and Mathias Tausig
+
 October 24th, 2015
 v0.13.0
      -- Add fp_rand()
diff --git a/doc/tfm.pdf b/doc/tfm.pdf
index ef23968..5b560b1 100644
Binary files a/doc/tfm.pdf and b/doc/tfm.pdf differ
diff --git a/makefile b/makefile
index 3d934f5..b9b3df6 100644
--- a/makefile
+++ b/makefile
@@ -1,7 +1,7 @@
 #makefile for TomsFastMath
 #
 #
-VERSION=0.14-develop
+VERSION=0.13.1
 
 CFLAGS += -Wall -W -Wshadow -Isrc/headers
 
diff --git a/src/headers/tfm.h b/src/headers/tfm.h
index 90642cd..a1ed374 100644
--- a/src/headers/tfm.h
+++ b/src/headers/tfm.h
@@ -22,8 +22,8 @@
  * Patch
  * XX - undefined
  */
-#define TFM_VERSION     0x000D0000
-#define TFM_VERSION_S   "v0.13.0"
+#define TFM_VERSION     0x000D0100
+#define TFM_VERSION_S   "v0.13.1"
 
 #ifndef MIN
    #define MIN(x,y) ((x)<(y)?(x):(y))
diff --git a/tfm.tex b/tfm.tex
index 7389fee..723f55b 100644
--- a/tfm.tex
+++ b/tfm.tex
@@ -49,7 +49,7 @@
 \begin{document}
 \frontmatter
 \pagestyle{empty}
-\title{TomsFastMath User Manual \\ v0.13.0}
+\title{TomsFastMath User Manual \\ v0.13.1}
 \author{Tom St Denis \\ tomstdenis@gmail.com}
 \maketitle
 This text and library are all hereby placed in the public domain.  This book has been formatted for B5