diff --git a/.github/workflows/phono3py-pytest-conda-mkl-v2.yml b/.github/workflows/phono3py-pytest-conda-mkl-v2.yml
index 77e87e6f..a6219859 100644
--- a/.github/workflows/phono3py-pytest-conda-mkl-v2.yml
+++ b/.github/workflows/phono3py-pytest-conda-mkl-v2.yml
@@ -6,6 +6,7 @@ on:
   push:
     branches-ignore:
     - publish-gh-pages
+    - develop
     - master
     - rc
 
diff --git a/.github/workflows/phono3py-pytest-conda-mkl.yml b/.github/workflows/phono3py-pytest-conda-mkl.yml
index fb72195e..0ebabd9b 100644
--- a/.github/workflows/phono3py-pytest-conda-mkl.yml
+++ b/.github/workflows/phono3py-pytest-conda-mkl.yml
@@ -6,6 +6,7 @@ on:
   push:
     branches-ignore:
     - publish-gh-pages
+    - develop
     - master
     - rc
 
diff --git a/.github/workflows/phono3py-pytest-conda.yml b/.github/workflows/phono3py-pytest-conda.yml
index 23da25e9..5ec01320 100644
--- a/.github/workflows/phono3py-pytest-conda.yml
+++ b/.github/workflows/phono3py-pytest-conda.yml
@@ -6,6 +6,7 @@ on:
   push:
     branches-ignore:
     - publish-gh-pages
+    - develop
     - master
     - rc
 
diff --git a/doc/changelog.md b/doc/changelog.md
index a80aac21..06ed8ba8 100644
--- a/doc/changelog.md
+++ b/doc/changelog.md
@@ -2,6 +2,10 @@
 
 # Change Log
 
+## Dec-26-2023: Version 2.9.1
+
+- Release to build conda-forge package.
+
 ## Dec-25-2023: Version 2.9.0
 
 - Pre-release of version 3.0.
diff --git a/doc/conf.py b/doc/conf.py
index dc3fd20e..b1aeed68 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -59,7 +59,7 @@ copyright = "2015, Atsushi Togo"
 # The short X.Y version.
 version = "2.9"
 # The full version, including alpha/beta/rc tags.
-release = "2.9.0"
+release = "2.9.1"
 
 # 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 132032a0..14d42a0d 100644
--- a/phono3py/version.py
+++ b/phono3py/version.py
@@ -33,4 +33,4 @@
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
-__version__ = "2.9.0"
+__version__ = "2.9.1"