diff --git a/NEWS.md b/NEWS.md
index d4b291881..6bfabaccb 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,6 @@
 ## MLKit NEWS
 
-### MLKit version 4.5.8 is released
+### MLKit version 4.5.9 is released
 
 * mael 2021-09-17: Fixed smltojs problem with generating statements
   consisting og lambda expressions.
diff --git a/configure.ac b/configure.ac
index bd7ec7981..2ab08a996 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT(MLKit, [v4.5.8])
+AC_INIT(MLKit, [v4.5.9])
 AC_CONFIG_HEADERS([src/config.h])
 AC_REVISION($Revision$)
 AC_CONFIG_FILES([src/SMLserver/apache/Makefile