diff --git a/doc/changelog.md b/doc/changelog.md
index 6f6212fe..661b84f6 100644
--- a/doc/changelog.md
+++ b/doc/changelog.md
@@ -2,7 +2,12 @@
 
 # Change Log
 
-## Jul-22-2024: Version 3.3.3
+## Aug-8-2024: Version 3.3.4
+
+- Fix of command line user interface.
+- Fix of phono3py yaml parser.
+
+## Aug-6-2024: Version 3.3.3
 
 - Provide functionality by `--cf3` and `--cf2` command options to create force
   constants from displacement-force dataset of random displacements when
diff --git a/doc/conf.py b/doc/conf.py
index da5cb499..19a19a0b 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -60,7 +60,7 @@ copyright = "2015, Atsushi Togo"
 # The short X.Y version.
 version = "3.3"
 # The full version, including alpha/beta/rc tags.
-release = "3.3.3"
+release = "3.3.4"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/phono3py/version.py b/phono3py/version.py
index 00dbceca..d279b99a 100644
--- a/phono3py/version.py
+++ b/phono3py/version.py
@@ -34,4 +34,4 @@
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
-__version__ = "3.3.3"
+__version__ = "3.3.4"