diff --git a/CHANGELOG.md b/CHANGELOG.md
index 556262d..ea1b8bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,8 +3,12 @@
 ## BumpVer 2023.1121
 
 - Fix [#200][gh_i200]: Fix compatability with packaging 23.0.
+- Fix [#203][gh_i203]: Add dev to the list of valid release tags
 
 [gh_i200]: https://github.com/mbarkhau/bumpver/issues/200
+[gh_i203]: https://github.com/mbarkhau/bumpver/issues/203
+
+Thank you [Sharon Yogev](https://github.com/sharonyogev) for your contribution.
 
 
 ## BumpVer 2022.1120
diff --git a/README.md b/README.md
index fc8672c..ef32754 100644
--- a/README.md
+++ b/README.md
@@ -609,7 +609,7 @@ Options:
   --tag-num                       Increment release tag number (rc1, rc2,
                                   rc3..).
   -t, --tag <NAME>                Override release tag of current_version. Valid
-                                  options are: alpha, beta, rc, post, final.
+                                  options are: alpha, beta, dev, rc, post, final.
   -p, --patch                     Increment PATCH component.
   -m, --minor                     Increment MINOR component.
   --major                         Increment MAJOR component.
@@ -644,22 +644,22 @@ final
 
 [url_calver_org_scheme]: https://calver.org/#scheme
 
-|    part    |     range / example(s)    |                     info                    |
-|------------|---------------------------|---------------------------------------------|
-| `MAJOR`    | 0..9, 10..99, 100..       | `bumpver update --major`                    |
-| `MINOR`    | 0..9, 10..99, 100..       | `bumpver update --minor`                    |
-| `PATCH`    | 0..9, 10..99, 100..       | `bumpver update --patch`                    |
-| `TAG`      | alpha, beta, rc, post     | `--tag=<tag>`                               |
-| `PYTAG`    | a, b, rc, post            | `--tag=<tag>`                               |
-| `NUM`      | 0, 1, 2...                | `-r/--tag-num`                              |
-| `YYYY`     | 2019, 2020...             | Full year, based on `strftime('%Y')`        |
-| `YY`       | 18, 19..99, 0, 1          | Short year, based on `int(strftime('%y'))`  |
-| `MM`       | 9, 10, 11, 12             | Month, based on `int(strftime('%m'))`       |
-| `DD`       | 1, 2, 3..31               | Day, based on `int(strftime('%d'))`         |
-| `BUILD`    | 1001, 1002 .. 1999, 22000 | build number (maintains lexical order)      |
-| `INC0`     | 0, 1, 2...                | 0-based auto incrementing number            |
-| `INC1`     | 1, 2...                   | 1-based auto incrementing number            |
-| `PYTAGNUM` | a0, a1, rc0, ...          | `PYTAG` + `NUM` (no white-space in between) |
+|    part    | range / example(s)         |                     info                    |
+|------------|----------------------------|---------------------------------------------|
+| `MAJOR`    | 0..9, 10..99, 100..        | `bumpver update --major`                    |
+| `MINOR`    | 0..9, 10..99, 100..        | `bumpver update --minor`                    |
+| `PATCH`    | 0..9, 10..99, 100..        | `bumpver update --patch`                    |
+| `TAG`      | dev, alpha, beta, rc, post | `--tag=<tag>`                               |
+| `PYTAG`    | a, b, rc, post             | `--tag=<tag>`                               |
+| `NUM`      | 0, 1, 2...                 | `-r/--tag-num`                              |
+| `YYYY`     | 2019, 2020...              | Full year, based on `strftime('%Y')`        |
+| `YY`       | 18, 19..99, 0, 1           | Short year, based on `int(strftime('%y'))`  |
+| `MM`       | 9, 10, 11, 12              | Month, based on `int(strftime('%m'))`       |
+| `DD`       | 1, 2, 3..31                | Day, based on `int(strftime('%d'))`         |
+| `BUILD`    | 1001, 1002 .. 1999, 22000  | build number (maintains lexical order)      |
+| `INC0`     | 0, 1, 2...                 | 0-based auto incrementing number            |
+| `INC1`     | 1, 2...                    | 1-based auto incrementing number            |
+| `PYTAGNUM` | a0, a1, rc0, ...           | `PYTAG` + `NUM` (no white-space in between) |
 
 
 The following are also available, but you should review the [Normalization Caveats](#normalization-caveats) before you decide to use them.
diff --git a/src/bumpver/cli.py b/src/bumpver/cli.py
index 803864f..7870220 100755
--- a/src/bumpver/cli.py
+++ b/src/bumpver/cli.py
@@ -68,7 +68,7 @@ def _configure_logging(verbose: int = 0) -> None:
     logger.debug("Logging configured.")
 
 
-VALID_RELEASE_TAG_VALUES = ("alpha", "beta", "rc", "post", "final")
+VALID_RELEASE_TAG_VALUES = ("alpha", "beta", "dev", "rc", "post", "final")
 
 
 _current_date = dt.date.today().isoformat()
diff --git a/src/bumpver/v2patterns.py b/src/bumpver/v2patterns.py
index 4758440..ee9008f 100644
--- a/src/bumpver/v2patterns.py
+++ b/src/bumpver/v2patterns.py
@@ -82,8 +82,8 @@ PART_PATTERNS = collections.OrderedDict(
         ('PATCH'  , r"[0-9]+"),
         ('BUILD'  , r"[0-9]+"),
         ('BLD'    , r"[1-9][0-9]*"),
-        ('TAG'    , r"preview|final|alpha|beta|post|rc"),
-        ('PYTAG'  , r"post|rc|a|b"),
+        ('TAG'    , r"preview|final|dev|alpha|beta|post|rc"),
+        ('PYTAG'  , r"dev|post|rc|a|b"),
         ('GITHASH', r"\.[0-9]+\+.*"),
         ('NUM'    , r"[0-9]+"),
         ('INC0'   , r"[0-9]+"),
diff --git a/src/bumpver/version.py b/src/bumpver/version.py
index 0eff7ac..01e9ca6 100644
--- a/src/bumpver/version.py
+++ b/src/bumpver/version.py
@@ -16,7 +16,7 @@ def parse_version(version: str) -> typ.Any:
         import pkg_resources
 
         return pkg_resources.parse_version(version)
-    except (ImportError, pkg_resources.extern.packaging.version.InvalidVersion):
+    except (ImportError, ValueError):
         import looseversion
 
         return looseversion.LooseVersion(version)
diff --git a/test/test_cli.py b/test/test_cli.py
index 5f96a59..bcccb21 100644
--- a/test/test_cli.py
+++ b/test/test_cli.py
@@ -258,6 +258,15 @@ def test_incr_tag(runner):
     assert f"Version: {new_version}\n" in result.output
 
 
+def test_dev_tag(runner):
+    old_version = "0.1.0"
+    new_version = "0.1.1dev0"
+
+    result = runner.invoke(cli.cli, ['test', "-vv", old_version, SEMVER, "--patch", "--tag", "dev"])
+    assert result.exit_code == 0
+    assert f"Version: {new_version}\n" in result.output
+
+
 def test_incr_tag_num(runner):
     old_version = "0.1.0b0"
     new_version = "0.1.0b1"