diff --git a/src/poetry/core/semver/patterns.py b/src/poetry/core/semver/patterns.py
index 0c3629b15..0bbf5d79f 100644
--- a/src/poetry/core/semver/patterns.py
+++ b/src/poetry/core/semver/patterns.py
@@ -8,7 +8,7 @@
 )
 
 _COMPLETE_VERSION = (
-    fr"v?(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?{MODIFIERS}(?:\+[^\s]+)?"
+    fr"v?(?:\d+!)?(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?{MODIFIERS}(?:\+[^\s]+)?"
 )
 
 COMPLETE_VERSION = re.compile("(?i)" + _COMPLETE_VERSION)
diff --git a/src/poetry/core/semver/version.py b/src/poetry/core/semver/version.py
index ad89860b5..e617ddc62 100644
--- a/src/poetry/core/semver/version.py
+++ b/src/poetry/core/semver/version.py
@@ -171,6 +171,8 @@ def from_parts(
         post: Optional[ReleaseTag] = None,
         dev: Optional[ReleaseTag] = None,
         local: "LocalSegmentType" = None,
+        *,
+        epoch: int = 0,
     ) -> "Version":
         return cls(
             release=Release(major=major, minor=minor, patch=patch, extra=extra),
@@ -178,4 +180,5 @@ def from_parts(
             post=post,
             dev=dev,
             local=local,
+            epoch=epoch,
         )
diff --git a/tests/semver/test_helpers.py b/tests/semver/test_helpers.py
index c0054e984..389612254 100644
--- a/tests/semver/test_helpers.py
+++ b/tests/semver/test_helpers.py
@@ -25,6 +25,7 @@
         (">=1.2.3", VersionRange(min=Version.from_parts(1, 2, 3), include_min=True)),
         ("=1.2.3", Version.from_parts(1, 2, 3)),
         ("1.2.3", Version.from_parts(1, 2, 3)),
+        ("1!2.3.4", Version.from_parts(2, 3, 4, epoch=1)),
         ("=1.0", Version.from_parts(1, 0, 0)),
         ("1.2.3b5", Version.from_parts(1, 2, 3, pre=ReleaseTag("beta", 5))),
         (">= 1.2.3", VersionRange(min=Version.from_parts(1, 2, 3), include_min=True)),
diff --git a/tests/semver/test_version.py b/tests/semver/test_version.py
index 0d18a1c51..b29cae723 100644
--- a/tests/semver/test_version.py
+++ b/tests/semver/test_version.py
@@ -28,6 +28,7 @@
         ("1.0.0-post1", Version.from_parts(1, 0, 0, post=ReleaseTag("post", 1))),
         ("0.6c", Version.from_parts(0, 6, 0, pre=ReleaseTag("rc", 0))),
         ("0.6pre", Version.from_parts(0, 6, 0, pre=ReleaseTag("preview", 0))),
+        ("1!2.3.4", Version.from_parts(2, 3, 4, epoch=1)),
     ],
 )
 def test_parse_valid(text: str, version: Version):