diff --git a/CITATION.cff b/CITATION.cff
index 450996743..2cce139d7 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -3,8 +3,8 @@ message: If you use this software, please cite both the article from preferred-c
   references, and the software itself.
 type: software
 title: FloPy
-version: 3.9.0
-date-released: '2024-12-20'
+version: 3.10.0.dev0
+date-released: '2024-12-19'
 doi: 10.5066/F7BK19FH
 abstract: A Python package to create, run, and post-process MODFLOW-based models.
 repository-artifact: https://pypi.org/project/flopy
diff --git a/README.md b/README.md
index bfe9bfbe5..8f8996e22 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 
 <img src="https://raw.githubusercontent.com/modflowpy/flopy/master/examples/images/flopy3.png" alt="flopy3" style="width:50;height:20">
 
-### Version 3.9.0
+### Version 3.10.0.dev0
 [![flopy continuous integration](https://github.com/modflowpy/flopy/actions/workflows/commit.yml/badge.svg?branch=develop)](https://github.com/modflowpy/flopy/actions/workflows/commit.yml)
 [![Read the Docs](https://github.com/modflowpy/flopy/actions/workflows/rtd.yml/badge.svg?branch=develop)](https://github.com/modflowpy/flopy/actions/workflows/rtd.yml)
 
@@ -150,7 +150,7 @@ How to Cite
 
 ##### ***Software/Code citation for FloPy:***
 
-[Bakker, Mark, Post, Vincent, Hughes, J. D., Langevin, C. D., White, J. T., Leaf, A. T., Paulinski, S. R., Bellino, J. C., Morway, E. D., Toews, M. W., Larsen, J. D., Fienen, M. N., Starn, J. J., Brakenhoff, D. A., and Bonelli, W. P., 2024, FloPy v3.9.0: U.S. Geological Survey Software Release, 20 December 2024, https://doi.org/10.5066/F7BK19FH](https://doi.org/10.5066/F7BK19FH)
+[Bakker, Mark, Post, Vincent, Hughes, J. D., Langevin, C. D., White, J. T., Leaf, A. T., Paulinski, S. R., Bellino, J. C., Morway, E. D., Toews, M. W., Larsen, J. D., Fienen, M. N., Starn, J. J., Brakenhoff, D. A., and Bonelli, W. P., 2024, FloPy v3.10.0.dev0: U.S. Geological Survey Software Release, 19 December 2024, https://doi.org/10.5066/F7BK19FH](https://doi.org/10.5066/F7BK19FH)
 
 
 Additional FloPy Related Publications
diff --git a/docs/PyPI_release.md b/docs/PyPI_release.md
index 5a63b8b59..66c60d367 100644
--- a/docs/PyPI_release.md
+++ b/docs/PyPI_release.md
@@ -30,4 +30,4 @@ How to Cite
 
 *Software/Code citation for FloPy:*
 
-[Bakker, Mark, Post, Vincent, Hughes, J. D., Langevin, C. D., White, J. T., Leaf, A. T., Paulinski, S. R., Bellino, J. C., Morway, E. D., Toews, M. W., Larsen, J. D., Fienen, M. N., Starn, J. J., Brakenhoff, D. A., and Bonelli, W. P., 2024, FloPy v3.9.0: U.S. Geological Survey Software Release, 20 December 2024, https://doi.org/10.5066/F7BK19FH](https://doi.org/10.5066/F7BK19FH)
+[Bakker, Mark, Post, Vincent, Hughes, J. D., Langevin, C. D., White, J. T., Leaf, A. T., Paulinski, S. R., Bellino, J. C., Morway, E. D., Toews, M. W., Larsen, J. D., Fienen, M. N., Starn, J. J., Brakenhoff, D. A., and Bonelli, W. P., 2024, FloPy v3.10.0.dev0: U.S. Geological Survey Software Release, 19 December 2024, https://doi.org/10.5066/F7BK19FH](https://doi.org/10.5066/F7BK19FH)
diff --git a/flopy/version.py b/flopy/version.py
index 8763a751e..e308abc04 100644
--- a/flopy/version.py
+++ b/flopy/version.py
@@ -1,4 +1,4 @@
 # flopy version file automatically created using
-# update_version.py on December 20, 2024 01:37:30
+# update_version.py on December 19, 2024 21:40:33
 
-__version__ = "3.9.0"
+__version__ = "3.10.0.dev0"
diff --git a/version.txt b/version.txt
index b72ad011f..e4f5f685f 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-3.9.0
\ No newline at end of file
+3.10.0.dev0
\ No newline at end of file