diff --git a/Cargo.lock b/Cargo.lock
index 72cd559..a0b02fb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -326,7 +326,7 @@ dependencies = [
 
 [[package]]
 name = "omikuji"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "assert_approx_eq",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index ff4bbb7..dc9fed4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "omikuji"
 description = "an efficient implementation of Partitioned Label Treesand its variations for extreme multi-label classification"
-version = "0.3.3"
+version = "0.3.4"
 edition = "2018"
 authors = ["Tom Dong <tom.tung.dyb@gmail.com>"]
 license = "MIT"
diff --git a/c-api/Cargo.lock b/c-api/Cargo.lock
index dc2b31a..5d479c3 100644
--- a/c-api/Cargo.lock
+++ b/c-api/Cargo.lock
@@ -358,7 +358,7 @@ dependencies = [
 
 [[package]]
 name = "omikuji"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "hashbrown",
  "itertools",
@@ -378,7 +378,7 @@ dependencies = [
 
 [[package]]
 name = "omikuji_c-api"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "cbindgen",
  "itertools",
diff --git a/c-api/Cargo.toml b/c-api/Cargo.toml
index 4508d45..7ffcc53 100644
--- a/c-api/Cargo.toml
+++ b/c-api/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "omikuji_c-api"
-version = "0.3.3"
+version = "0.3.4"
 edition = "2018"
 authors = ["Tom Dong <tom.tung.dyb@gmail.com>"]
 
diff --git a/python-wrapper/omikuji/__init__.py b/python-wrapper/omikuji/__init__.py
index 2637ef5..bec4bd4 100644
--- a/python-wrapper/omikuji/__init__.py
+++ b/python-wrapper/omikuji/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.3"
+__version__ = "0.3.4"
 __all__ = ["Model", "LossType"]
 
 from ._libomikuji import lib, ffi
diff --git a/setup.py b/setup.py
index 61a871b..2a5bffb 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ def load_readme():
 
 setup(
     name="omikuji",
-    version="0.3.3",
+    version="0.3.4",
     author="Tom Dong",
     author_email="tom.tung.dyb@gmail.com",
     description=(
@@ -54,6 +54,7 @@ def load_readme():
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Rust",
         "License :: OSI Approved :: MIT License",