diff --git a/poetry/vcs/git.py b/poetry/vcs/git.py
index 791e68dd1af..28b8de74c2b 100644
--- a/poetry/vcs/git.py
+++ b/poetry/vcs/git.py
@@ -229,7 +229,9 @@ def rev_parse(self, rev, folder=None):  # type: (...) -> str
                 folder.as_posix(),
             ]
 
-        args += ["rev-parse", rev]
+        # We need "^{commit}" to ensure that the commit SHA of the commit the
+        # tag points to is returned, even in the case of annotated tags.
+        args += ["rev-parse", rev + "^{commit}"]
 
         return self.run(*args)