diff --git a/CHANGELOG.md b/CHANGELOG.md
index 393035ee..928f3015 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,21 @@
 Change Log / Release Log for mallocMC
 ================================================================
 
+2.3.1crp
+--------
+**Date:** 2019-02-14
+
+A critical bug was fixed which can result in an illegal memory access.
+
+### Changes to mallocMC 2.3.0crp
+
+**Bug fixes**
+ - fix illegal memory access in `XMallocSIMD` #150
+
+**Misc:**
+ - CMake: Honor `<packageName>_ROOT` Env Hints #154
+
+
 2.3.0crp
 --------
 **Date:** 2018-06-11
diff --git a/src/include/mallocMC/version.hpp b/src/include/mallocMC/version.hpp
index 28e80914..f2c15e1e 100644
--- a/src/include/mallocMC/version.hpp
+++ b/src/include/mallocMC/version.hpp
@@ -39,7 +39,7 @@
 /** the mallocMC version: major API changes should be reflected here */
 #define MALLOCMC_VERSION_MAJOR 2
 #define MALLOCMC_VERSION_MINOR 3
-#define MALLOCMC_VERSION_PATCH 0
+#define MALLOCMC_VERSION_PATCH 1
 
 /** the mallocMC flavor is used to differentiate the releases of the
  *  Computational Radiation Physics group (crp) from other releases