diff --git a/.build_rtd_docs/Doxyfile b/.build_rtd_docs/Doxyfile
index e2ee288f100..a4511abc92c 100644
--- a/.build_rtd_docs/Doxyfile
+++ b/.build_rtd_docs/Doxyfile
@@ -37,7 +37,7 @@ PROJECT_NAME           = "MODFLOW 6"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "version 6.6.0.dev0"
+PROJECT_NUMBER         = "version 6.7.0.dev0"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/CITATION.cff b/CITATION.cff
index c07210ad7c5..d13fd7bcd09 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: If you use this software, please cite the software itself.
 type: software
 title: MODFLOW 6 Modular Hydrologic Model
-version: 6.6.0.dev0
-date-released: '2024-05-23'
+version: 6.7.0.dev0
+date-released: '2024-12-19'
 doi: 10.5066/F76Q1VQV
 abstract: MODFLOW 6 is an object-oriented program and framework developed to provide
   a platform for supporting multiple models and multiple types of models within the
diff --git a/README.md b/README.md
index 6f21ea88fcc..2b14d00daeb 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 This is the development repository for the USGS MODFLOW 6 Hydrologic Model. The  official USGS distribution is available at [USGS Release Page](https://water.usgs.gov/ogw/modflow/MODFLOW.html).
 
-### Version 6.6.0.dev0 (preliminary)
+### Version 6.7.0.dev0 (preliminary)
 
 [![GitHub release](https://img.shields.io/github/release/MODFLOW-USGS/modflow6.svg)](https://github.com/MODFLOW-USGS/modflow6/releases/latest)
 [![MODFLOW 6 continuous integration](https://github.com/MODFLOW-USGS/modflow6/actions/workflows/ci.yml/badge.svg)](https://github.com/MODFLOW-USGS/modflow6/actions/workflows/ci.yml)
diff --git a/code.json b/code.json
index f324cd0ccec..5980a4e821f 100644
--- a/code.json
+++ b/code.json
@@ -18,9 +18,9 @@
             "email": "langevin@usgs.gov"
         },
         "laborHours": -1,
-        "version": "6.6.0.dev0",
+        "version": "6.7.0.dev0",
         "date": {
-            "metadataLastUpdated": "2024-05-23"
+            "metadataLastUpdated": "2024-12-19"
         },
         "organization": "U.S. Geological Survey",
         "permissions": {
diff --git a/doc/version.py b/doc/version.py
index 9a5659f56f1..b26252f3ec5 100644
--- a/doc/version.py
+++ b/doc/version.py
@@ -1,3 +1,3 @@
 # MODFLOW 6 version file automatically created using...update_version.py
-# created on...May 23, 2024 16:39:07
-__version__ = "6.6.0.dev0"
+# created on...December 19, 2024 20:40:15
+__version__ = "6.7.0.dev0"
diff --git a/doc/version.tex b/doc/version.tex
index 50137e9a961..bedb3c400c7 100644
--- a/doc/version.tex
+++ b/doc/version.tex
@@ -1,3 +1,3 @@
-\newcommand{\modflowversion}{mf6.6.0.dev0}
-\newcommand{\modflowdate}{May 23, 2024}
+\newcommand{\modflowversion}{mf6.7.0.dev0}
+\newcommand{\modflowdate}{December 19, 2024}
 \newcommand{\currentmodflowversion}{Version \modflowversion---\modflowdate}
diff --git a/meson.build b/meson.build
index c80643f5cb5..52c7849d295 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project(
   'MODFLOW 6',
   'fortran',
-  version: '6.6.0.dev0',
+  version: '6.7.0.dev0',
   license: 'CC0',
   meson_version: '>= 1.1.0',
   default_options : [
diff --git a/pixi.toml b/pixi.toml
index 6ee06b92fb7..49541d0a43a 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -2,7 +2,7 @@
 name = "modflow6"
 channels = ["conda-forge"]
 platforms = ["win-64", "linux-64", "linux-aarch64", "osx-arm64", "osx-64"]
-version = "6.6.0.dev0"
+version = "6.7.0.dev0"
 
 [dependencies]
 appdirs = "*"
diff --git a/src/Utilities/version.f90 b/src/Utilities/version.f90
index de7e8b13d95..2550c364a4c 100644
--- a/src/Utilities/version.f90
+++ b/src/Utilities/version.f90
@@ -17,8 +17,8 @@ module VersionModule
   public
   ! -- modflow 6 version
   integer(I4B), parameter :: IDEVELOPMODE = 1
-  character(len=*), parameter :: VERSIONNUMBER = '6.6.0.dev0'
-  character(len=*), parameter :: VERSIONTAG = ' (preliminary) 05/23/2024'
+  character(len=*), parameter :: VERSIONNUMBER = '6.7.0.dev0'
+  character(len=*), parameter :: VERSIONTAG = ' (preliminary) 12/19/2024'
   character(len=40), parameter :: VERSION = VERSIONNUMBER//VERSIONTAG
   character(len=2), parameter :: MFVNAM = ' 6'
   character(len=*), parameter :: MFTITLE = &
diff --git a/version.txt b/version.txt
index a6d068245c2..e38cf193ca0 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-6.6.0.dev0
\ No newline at end of file
+6.7.0.dev0
\ No newline at end of file