diff --git a/openapi_spec_validator/shortcuts.py b/openapi_spec_validator/shortcuts.py
index 77ee0d8..9921d9d 100644
--- a/openapi_spec_validator/shortcuts.py
+++ b/openapi_spec_validator/shortcuts.py
@@ -10,21 +10,29 @@
 from openapi_spec_validator.validation import OpenAPIV2SpecValidator
 from openapi_spec_validator.validation import OpenAPIV30SpecValidator
 from openapi_spec_validator.validation import OpenAPIV31SpecValidator
-from openapi_spec_validator.validation.finders import SpecFinder
-from openapi_spec_validator.validation.finders import SpecVersion
+from openapi_spec_validator.validation.exceptions import ValidatorDetectError
 from openapi_spec_validator.validation.protocols import SupportsValidation
 from openapi_spec_validator.validation.types import SpecValidatorType
 from openapi_spec_validator.validation.validators import SpecValidator
-
-SPECS: Mapping[SpecVersion, SpecValidatorType] = {
-    SpecVersion("swagger", "2.0"): OpenAPIV2SpecValidator,
-    SpecVersion("openapi", "3.0"): OpenAPIV30SpecValidator,
-    SpecVersion("openapi", "3.1"): OpenAPIV31SpecValidator,
+from openapi_spec_validator.versions import consts as versions
+from openapi_spec_validator.versions.datatypes import SpecVersion
+from openapi_spec_validator.versions.exceptions import OpenAPIVersionNotFound
+from openapi_spec_validator.versions.shortcuts import get_spec_version
+
+SPEC2VALIDATOR: Mapping[SpecVersion, SpecValidatorType] = {
+    versions.OPENAPIV2: OpenAPIV2SpecValidator,
+    versions.OPENAPIV30: OpenAPIV30SpecValidator,
+    versions.OPENAPIV31: OpenAPIV31SpecValidator,
 }
 
 
 def get_validator_cls(spec: Schema) -> SpecValidatorType:
-    return SpecFinder(SPECS).find(spec)
+    try:
+        spec_version = get_spec_version(spec)
+    # backward compatibility
+    except OpenAPIVersionNotFound:
+        raise ValidatorDetectError
+    return SPEC2VALIDATOR[spec_version]
 
 
 def validate_spec(
diff --git a/openapi_spec_validator/validation/finders.py b/openapi_spec_validator/validation/finders.py
deleted file mode 100644
index 74d2573..0000000
--- a/openapi_spec_validator/validation/finders.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from typing import Mapping
-from typing import NamedTuple
-
-from jsonschema_spec.typing import Schema
-
-from openapi_spec_validator.validation.exceptions import ValidatorDetectError
-from openapi_spec_validator.validation.types import SpecValidatorType
-
-
-class SpecVersion(NamedTuple):
-    name: str
-    version: str
-
-
-class SpecFinder:
-    def __init__(self, specs: Mapping[SpecVersion, SpecValidatorType]) -> None:
-        self.specs = specs
-
-    def find(self, spec: Schema) -> SpecValidatorType:
-        for v, classes in self.specs.items():
-            if v.name in spec and spec[v.name].startswith(v.version):
-                return classes
-        raise ValidatorDetectError("Spec schema version not detected")
diff --git a/openapi_spec_validator/versions/__init__.py b/openapi_spec_validator/versions/__init__.py
new file mode 100644
index 0000000..2203413
--- /dev/null
+++ b/openapi_spec_validator/versions/__init__.py
@@ -0,0 +1,13 @@
+from openapi_spec_validator.versions.consts import OPENAPIV2
+from openapi_spec_validator.versions.consts import OPENAPIV30
+from openapi_spec_validator.versions.consts import OPENAPIV31
+from openapi_spec_validator.versions.datatypes import SpecVersion
+from openapi_spec_validator.versions.shortcuts import get_spec_version
+
+__all__ = [
+    "OPENAPIV2",
+    "OPENAPIV30",
+    "OPENAPIV31",
+    "SpecVersion",
+    "get_spec_version",
+]
diff --git a/openapi_spec_validator/versions/consts.py b/openapi_spec_validator/versions/consts.py
new file mode 100644
index 0000000..6b5ea7d
--- /dev/null
+++ b/openapi_spec_validator/versions/consts.py
@@ -0,0 +1,23 @@
+from typing import List
+
+from openapi_spec_validator.versions.datatypes import SpecVersion
+
+OPENAPIV2 = SpecVersion(
+    keyword="swagger",
+    major="2",
+    minor="0",
+)
+
+OPENAPIV30 = SpecVersion(
+    keyword="openapi",
+    major="3",
+    minor="0",
+)
+
+OPENAPIV31 = SpecVersion(
+    keyword="openapi",
+    major="3",
+    minor="1",
+)
+
+VERSIONS: List[SpecVersion] = [OPENAPIV2, OPENAPIV30, OPENAPIV31]
diff --git a/openapi_spec_validator/versions/datatypes.py b/openapi_spec_validator/versions/datatypes.py
new file mode 100644
index 0000000..a869992
--- /dev/null
+++ b/openapi_spec_validator/versions/datatypes.py
@@ -0,0 +1,15 @@
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class SpecVersion:
+    """
+    Spec version designates the OAS feature set.
+    """
+
+    keyword: str
+    major: str
+    minor: str
+
+    def __str__(self) -> str:
+        return f"OpenAPIV{self.major}.{self.minor}"
diff --git a/openapi_spec_validator/versions/exceptions.py b/openapi_spec_validator/versions/exceptions.py
new file mode 100644
index 0000000..91a5cbb
--- /dev/null
+++ b/openapi_spec_validator/versions/exceptions.py
@@ -0,0 +1,6 @@
+from openapi_spec_validator.exceptions import OpenAPIError
+
+
+class OpenAPIVersionNotFound(OpenAPIError):
+    def __str__(self) -> str:
+        return "Specification version not found"
diff --git a/openapi_spec_validator/versions/finders.py b/openapi_spec_validator/versions/finders.py
new file mode 100644
index 0000000..f8b1ddc
--- /dev/null
+++ b/openapi_spec_validator/versions/finders.py
@@ -0,0 +1,26 @@
+from re import compile
+from typing import List
+
+from jsonschema_spec.typing import Schema
+
+from openapi_spec_validator.versions.datatypes import SpecVersion
+from openapi_spec_validator.versions.exceptions import OpenAPIVersionNotFound
+
+
+class SpecVersionFinder:
+    pattern = compile(r"(?P<major>\d+)\.(?P<minor>\d+)(\..*)?")
+
+    def __init__(self, versions: List[SpecVersion]) -> None:
+        self.versions = versions
+
+    def find(self, spec: Schema) -> SpecVersion:
+        for v in self.versions:
+            if v.keyword in spec:
+                version_str = spec[v.keyword]
+                m = self.pattern.match(version_str)
+                if m:
+                    version = SpecVersion(**m.groupdict(), keyword=v.keyword)
+                    if v == version:
+                        return v
+
+        raise OpenAPIVersionNotFound
diff --git a/openapi_spec_validator/versions/shortcuts.py b/openapi_spec_validator/versions/shortcuts.py
new file mode 100644
index 0000000..73841e9
--- /dev/null
+++ b/openapi_spec_validator/versions/shortcuts.py
@@ -0,0 +1,10 @@
+from jsonschema_spec.typing import Schema
+
+from openapi_spec_validator.versions.consts import VERSIONS
+from openapi_spec_validator.versions.datatypes import SpecVersion
+from openapi_spec_validator.versions.finders import SpecVersionFinder
+
+
+def get_spec_version(spec: Schema) -> SpecVersion:
+    finder = SpecVersionFinder(VERSIONS)
+    return finder.find(spec)
diff --git a/tests/integration/test_versions.py b/tests/integration/test_versions.py
new file mode 100644
index 0000000..891dd50
--- /dev/null
+++ b/tests/integration/test_versions.py
@@ -0,0 +1,43 @@
+import pytest
+
+from openapi_spec_validator.versions import consts as versions
+from openapi_spec_validator.versions.exceptions import OpenAPIVersionNotFound
+from openapi_spec_validator.versions.shortcuts import get_spec_version
+
+
+class TestGetSpecVersion:
+    def test_no_keyword(self):
+        spec = {}
+
+        with pytest.raises(OpenAPIVersionNotFound):
+            get_spec_version(spec)
+
+    @pytest.mark.parametrize("keyword", ["swagger", "openapi"])
+    @pytest.mark.parametrize("version", ["x.y.z", "xyz2.0.0", "2.xyz0.0"])
+    def test_invalid(self, keyword, version):
+        spec = {
+            keyword: version,
+        }
+
+        with pytest.raises(OpenAPIVersionNotFound):
+            get_spec_version(spec)
+
+    @pytest.mark.parametrize(
+        "keyword,version,expected",
+        [
+            ("swagger", "2.0", versions.OPENAPIV2),
+            ("openapi", "3.0.0", versions.OPENAPIV30),
+            ("openapi", "3.0.1", versions.OPENAPIV30),
+            ("openapi", "3.0.2", versions.OPENAPIV30),
+            ("openapi", "3.0.3", versions.OPENAPIV30),
+            ("openapi", "3.1.0", versions.OPENAPIV31),
+        ],
+    )
+    def test_valid(self, keyword, version, expected):
+        spec = {
+            keyword: version,
+        }
+
+        result = get_spec_version(spec)
+
+        assert result == expected