Bump version to 1.5.1.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3455cc6..69e6548 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,7 +55,7 @@
 SET(PACKAGE_NAME ${PACKAGE})
 SET(PACKAGE_VERSION_MAJOR "1")
 SET(PACKAGE_VERSION_MINOR "5")
-SET(PACKAGE_VERSION_MICRO "0a")
+SET(PACKAGE_VERSION_MICRO "1")
 #SET(VERSION "${PACKAGE_VERSION_MAJOR}.${PACKAGE_VERSION_MINOR}")
 SET(VERSION "${PACKAGE_VERSION_MAJOR}.${PACKAGE_VERSION_MINOR}.${PACKAGE_VERSION_MICRO}")
 SET(PACKAGE_VERSION ${VERSION})
diff --git a/NEWS.md b/NEWS.md
index 98eff26..ab2be0a 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-1.5.x [2018-xx-xx]
+1.5.1 [2018-04-11]
 ==================
 
 * Choose format of installed documentation based on available tools.