diff --git a/docs/Doxyfile b/docs/Doxyfile
index 5617db620..82fbc181d 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME           = ChibiOS/RT
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.3.0
+PROJECT_NUMBER         = 2.3.1
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
diff --git a/os/kernel/include/ch.h b/os/kernel/include/ch.h
index 3bd81e16b..405ebc894 100644
--- a/os/kernel/include/ch.h
+++ b/os/kernel/include/ch.h
@@ -39,7 +39,7 @@
 /**
  * @brief   Kernel version string.
  */
-#define CH_KERNEL_VERSION       "2.3.0unstable"
+#define CH_KERNEL_VERSION       "2.3.1unstable"
 
 /**
  * @brief   Kernel version major number.
@@ -54,7 +54,7 @@
 /**
  * @brief   Kernel version patch number.
  */
-#define CH_KERNEL_PATCH         0
+#define CH_KERNEL_PATCH         1
 
 /*
  * Common values.