diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea897626b..7e6564f8d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,14 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
 
+## [1.6.5] - 2018-02-05
+
+### Fixed
+
+- Avoid UB: Do not calculate pointer outside array bounds.
+- Specify proto2 syntax in .proto files to appease protoc.
+
+
 ## [1.6.4] - 2018-11-08
 
 ### Added
@@ -331,7 +339,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Make pbf reader and writer code endianess-aware.
 
 
-[unreleased]: https://github.com/osmcode/libosmium/compare/v1.6.4...HEAD
+[unreleased]: https://github.com/osmcode/libosmium/compare/v1.6.5...HEAD
+[1.6.5]: https://github.com/osmcode/libosmium/compare/v1.6.4...v1.6.5
 [1.6.4]: https://github.com/osmcode/libosmium/compare/v1.6.3...v1.6.4
 [1.6.3]: https://github.com/osmcode/libosmium/compare/v1.6.2...v1.6.3
 [1.6.2]: https://github.com/osmcode/libosmium/compare/v1.6.1...v1.6.2
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 11d3ea218..c6c0b1467 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ project(protozero)
 
 set(PROTOZERO_VERSION_MAJOR 1)
 set(PROTOZERO_VERSION_MINOR 6)
-set(PROTOZERO_VERSION_PATCH 4)
+set(PROTOZERO_VERSION_PATCH 5)
 
 set(PROTOZERO_VERSION
     "${PROTOZERO_VERSION_MAJOR}.${PROTOZERO_VERSION_MINOR}.${PROTOZERO_VERSION_PATCH}")
diff --git a/include/protozero/version.hpp b/include/protozero/version.hpp
index 11901f636..dca7493fb 100644
--- a/include/protozero/version.hpp
+++ b/include/protozero/version.hpp
@@ -23,12 +23,12 @@ documentation.
 #define PROTOZERO_VERSION_MINOR 6
 
 /// The patch number
-#define PROTOZERO_VERSION_PATCH 4
+#define PROTOZERO_VERSION_PATCH 5
 
 /// The complete version number
 #define PROTOZERO_VERSION_CODE (PROTOZERO_VERSION_MAJOR * 10000 + PROTOZERO_VERSION_MINOR * 100 + PROTOZERO_VERSION_PATCH)
 
 /// Version number as string
-#define PROTOZERO_VERSION_STRING "1.6.4"
+#define PROTOZERO_VERSION_STRING "1.6.5"
 
 #endif // PROTOZERO_VERSION_HPP