diff --git a/src/poetry/core/version/grammars/pep508.lark b/src/poetry/core/version/grammars/pep508.lark
index 0f32ff368..1b10d6ce0 100644
--- a/src/poetry/core/version/grammars/pep508.lark
+++ b/src/poetry/core/version/grammars/pep508.lark
@@ -10,7 +10,7 @@ _single_version: LEGACY_VERSION_CONSTRAINT
 _url: _AT URI
 marker_spec: marker
 
-NAME: /[a-zA-Z][a-zA-Z0-9-_.]*/
+NAME: /[a-zA-Z0-9][a-zA-Z0-9-_.]*/
 FULL_NAME: NAME
 EXTRA: NAME
 VERSION_CONSTRAINT: /(~=|==|!=|<=|>=|<|>|===)((?:(?<====)\s*[^\s]*)|(?:(?<===|!=)\s*v?(?:[0-9]+!)?[0-9]+(?:\.[0-9]+)*(?:[-_.]?(a|b|c|rc|alpha|beta|pre|preview)[-_.]?[0-9]*)?(?:(?:-[0-9]+)|(?:[-_.]?(post|rev|r)[-_.]?[0-9]*))?(?:(?:[-_.]?dev[-_.]?[0-9]*)?(?:\+[a-z0-9]+(?:[-_.][a-z0-9]+)*)? # local|\.\*)?)|(?:(?<=~=)\s*v?(?:[0-9]+!)?[0-9]+(?:\.[0-9]+)+(?:[-_.]?(a|b|c|rc|alpha|beta|pre|preview)[-_.]?[0-9]*)?(?:(?:-[0-9]+)|(?:[-_.]?(post|rev|r)[-_.]?[0-9]*))?(?:[-_.]?dev[-_.]?[0-9]*)?)|(?:(?<!==|!=|~=)\s*v?(?:[0-9]+!)?[0-9]+(?:\.[0-9]+)*(?:[-_.]?(a|b|c|rc|alpha|beta|pre|preview)[-_.]?[0-9]*)?(?:(?:-[0-9]+)|(?:[-_.]?(post|rev|r)[-_.]?[0-9]*))?(?:[-_.]?dev[-_.]?[0-9]*)?))/i
diff --git a/tests/packages/test_dependency.py b/tests/packages/test_dependency.py
index 822dfb8bd..4f86f01c7 100644
--- a/tests/packages/test_dependency.py
+++ b/tests/packages/test_dependency.py
@@ -356,6 +356,11 @@ def test_create_from_pep_508_url_with_activated_extras() -> None:
     assert dependency.extras == {"fred", "bar"}
 
 
+def test_create_from_pep_508_starting_with_digit() -> None:
+    dependency = Dependency.create_from_pep_508("2captcha-python")
+    assert dependency.name == "2captcha-python"
+
+
 @pytest.mark.parametrize(
     "dependency1, dependency2, expected",
     [