diff --git a/.bumpversion.cfg b/.bumpversion.cfg
deleted file mode 100644
index 3798f0a..0000000
--- a/.bumpversion.cfg
+++ /dev/null
@@ -1,35 +0,0 @@
-[bumpversion]
-current_version = 1.2.0a1
-commit = False
-tag = False
-parse = (?P<major>\d+)
-	\.(?P<minor>\d+)
-	\.(?P<patch>\d+)
-	((?P<prerelease>[a-z]+)
-	?(\.)?
-	(?P<num>\d+))?
-serialize =
-	{major}.{minor}.{patch}{prerelease}{num}
-	{major}.{minor}.{patch}
-
-[bumpversion:part:prerelease]
-first_value = a
-values =
-	a
-	b
-	rc
-
-[bumpversion:part:num]
-first_value = 1
-
-[bumpversion:file:dbt/adapters/mysql/__version__.py]
-search = version = "{current_version}"
-replace = version = "{new_version}"
-
-[bumpversion:file:dbt/adapters/mysql5/__version__.py]
-search = version = "{current_version}"
-replace = version = "{new_version}"
-
-[bumpversion:file:dbt/adapters/mariadb/__version__.py]
-search = version = "{current_version}"
-replace = version = "{new_version}"
diff --git a/.bumpversion.toml b/.bumpversion.toml
new file mode 100644
index 0000000..e09d8c3
--- /dev/null
+++ b/.bumpversion.toml
@@ -0,0 +1,56 @@
+[tool.bumpversion]
+current_version = "1.2.0a1"
+parse = '''
+     (?P<major>[\d]+) # major version number
+     \.(?P<minor>[\d]+) # minor version number
+     \.(?P<patch>[\d]+) # patch version number
+     (?P<prerelease>  # optional pre-release - ex: a1, b2, rc25
+     (?P<prekind>a|b|rc) # pre-release type
+     (?P<num>[\d]+) # pre-release version number
+     )?
+     ( # optional nightly release indicator
+     \.(?P<nightly>dev[0-9]+) # ex: .dev02142023
+     )? # expected matches: `1.15.0`, `1.5.0a11`, `1.5.0a1.dev123`, `1.5.0.dev123457`, expected failures: `1`, `1.5`, `1.5.2-a1`, `text1.5.0`
+'''
+serialize = [
+     "{major}.{minor}.{patch}{prekind}{num}.{nightly}",
+     "{major}.{minor}.{patch}.{nightly}",
+     "{major}.{minor}.{patch}{prekind}{num}",
+     "{major}.{minor}.{patch}",
+]
+commit = false
+tag = false
+
+[tool.bumpversion.parts.prekind]
+first_value = "a"
+optional_value = "final"
+values = [
+     "a",
+     "b",
+     "rc",
+     "final",
+]
+
+[tool.bumpversion.parts.num]
+first_value = "1"
+
+[[tool.bumpversion.files]]
+filename = "setup.py"
+
+[[tool.bumpversion.files]]
+filename = "dbt/adapters/mysql/__version__.py"
+
+[[tool.bumpversion.files]]
+filename = "dbt/adapters/mysql5/__version__.py"
+
+[[tool.bumpversion.files]]
+filename = "dbt/adapters/mariadb/__version__.py"
+
+[[tool.bumpversion.files]]
+filename = "dev-requirements.txt"
+parse = '''
+     (?P<major>[\d]+) # major version number
+     \.(?P<minor>[\d]+) # minor version number
+     .latest
+'''
+serialize = ["{major}.{minor}.latest"]
diff --git a/RELEASE.md b/RELEASE.md
index c423720..7500413 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -10,15 +10,15 @@
 1. Open a branch for the release
     - `git checkout -b releases/1.5.0`
 1. Update [`CHANGELOG.md`](CHANGELOG.md) with the most recent changes
-1. Bump the version using [`bump2version`](https://github.com/c4urself/bump2version/#bump2version):
-    1. Dry run first by running `bumpversion --dry-run --verbose --new-version <desired-version> <part>`. Some examples:
+1. Bump the version using [`bump-my-version`](https://github.com/callowayproject/bump-my-version):
+    1. Dry run first by running `bump-my-version bump --dry-run --verbose --new-version <desired-version> <part>`. Some examples:
         - Release candidates: `--new-version 1.5.0rc1 num`
         - Alpha releases: `--new-version 1.5.0a1 num`
         - Patch releases: `--new-version 1.5.1 patch`
         - Minor releases: `--new-version 1.5.0 minor`
         - Major releases: `--new-version 2.0.0 major`
-    1. Actually modify the files: `bumpversion --no-tag --new-version <desired-version> <part>`. An example:
-        - Minor releases: `bumpversion --no-tag --new-version 1.5.0 minor`
+    1. Actually modify the files: `bump-my-version bump --no-tag --new-version <desired-version> <part>`. An example:
+        - Minor releases: `bump-my-version bump --no-tag --new-version 1.5.0 minor`
   1. Check the diff with `git diff`
   1. Add the files that were changed with `git add --update`
   1. Commit with message `Release dbt-mysql v<desired-version>`
@@ -60,7 +60,7 @@ PyPI recognizes [pre-release versioning conventions](https://packaging.python.or
     - `git pull`
     - `git checkout -b bump-1.6.0a1`
     - Minor releases:
-        `bumpversion --no-tag --new-version 1.6.0a1 num`
+        `bump-my-version bump --no-tag --new-version 1.6.0a1 num`
     - Update the branch names in `dev-requirements.txt` from `@{previous-version}.latest` to `@{minor-version}.latest` (or `@main`)
     - Commit with message `Bump dbt-mysql 1.6.0a1`
     - `git push`
diff --git a/dev-requirements.txt b/dev-requirements.txt
index bb4f4d8..75723b7 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,7 +1,7 @@
 # install latest changes in dbt-core
 # TODO: how to automate switching from develop to version branches?
-# git+https://github.com/dbt-labs/dbt-core.git@1.4.latest#egg=dbt-core&subdirectory=core
-git+https://github.com/dbt-labs/dbt-core.git@1.4.latest#egg=dbt-tests-adapter&subdirectory=tests/adapter
+git+https://github.com/dbt-labs/dbt-core.git@1.2.latest#egg=dbt-core&subdirectory=core
+git+https://github.com/dbt-labs/dbt-core.git@1.2.latest#egg=dbt-tests-adapter&subdirectory=tests/adapter
 
 # if version 1.x or greater -> pin to major version
 # if version 0.x -> pin to minor
diff --git a/setup.py b/setup.py
index 7c67449..c176ec4 100644
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@ def _get_dbt_core_version():
 
 
 package_name = "dbt-mysql"
-package_version = "1.4.0a1"
+package_version = "1.2.0a1"
 dbt_core_version = _get_dbt_core_version()
 description = """The MySQL adapter plugin for dbt"""