diff --git a/VERSION.txt b/VERSION.txt
index 5d5322d..5c5330a 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-0.1.98
+0.1.99
diff --git a/python/src/sentencepiece/_version.py b/python/src/sentencepiece/_version.py
index f7c995b..bd5418d 100644
--- a/python/src/sentencepiece/_version.py
+++ b/python/src/sentencepiece/_version.py
@@ -1 +1 @@
-__version__ = '0.1.98'
+__version__ = '0.1.99'