diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 3ebdcbf01..affc21cc3 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,4 +1,4 @@
 [bumpversion]
-current_version = 1.9.0
+current_version = 1.9.1
 files = version.py
 
diff --git a/Changelog.md b/Changelog.md
index f04bda0cc..76aa23c9c 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,9 @@
+[v1.9.1](https://bitbucket.org/zxbasic/zxbasic/commits/tag/v1.9.1)
+===
++ ! Bugfix: array access read / write might overflow. Fixed.
++ Array access speedup and optimization.
++ Dropped support for PyPy and Python 2.x
+
 [v1.9.0](https://bitbucket.org/zxbasic/zxbasic/commits/tag/v1.9.0)
 ===
 + New and completely refactored optimizer which now allow patterns.<br />
@@ -6,7 +12,7 @@
 + New optimizer level -O4 (peephole)
 + zxbasm (assembler) now allows several instructions per line using `:`
 + zxbasm allows labels to be declared without using colon.
-+ Some other little optimizationn
++ Some other little optimization
 
 [v1.8.10](https://bitbucket.org/zxbasic/zxbasic/commits/tag/v1.8.10)
 ===
diff --git a/version.py b/version.py
index a05e3e317..c59279c5f 100755
--- a/version.py
+++ b/version.py
@@ -1 +1 @@
-VERSION = '1.9.0'
+VERSION = '1.9.1'