diff --git a/src/git_flow/command/tag.py b/src/git_flow/command/tag.py
index eb196e6..e494318 100644
--- a/src/git_flow/command/tag.py
+++ b/src/git_flow/command/tag.py
@@ -48,7 +48,7 @@ def tag(token: str | None = None, update_changelog: bool = False):
         current_tag = base.get_remote_api(token).get_latest_tag(suffix)
     else:
         # Commits se obtienen del último merge, listando hasta el primer forkpoint
-        branch = Git("show", merge_commit + "^2", patch=False, format="%h").firstline()
+        branch = Git("show", merge_commit + "^2", patch=False, format="%H").firstline()
         fork_point = Git.get_first_fork_point(branch, target)
         commits = Git.get_commits(fork_point, branch)
         # Último tag se obtiene localmente
@@ -74,7 +74,7 @@ def tag(token: str | None = None, update_changelog: bool = False):
         if ci:
             Git("push").exec()
 
-    tag_commit = Git("show", "HEAD", patch=False, format="%h").firstline()
+    tag_commit = Git("show", "HEAD", patch=False, format="%H").firstline()
 
     if ci:
         base.io_success(base.get_remote_api(token).create_tag(next_tag, tag_commit))