diff --git a/gpyg/operators/keys.py b/gpyg/operators/keys.py
index 6e16089..e0a1d9f 100644
--- a/gpyg/operators/keys.py
+++ b/gpyg/operators/keys.py
@@ -521,7 +521,31 @@ def revoke_signature(
             cmd,
             input=passphrase + "\n" if passphrase else None,
         )
-        print(proc.output)
+        if proc.code == 0:
+            return self.reload()
+        else:
+            raise ExecutionError(proc.output)
+
+    def set_primary_uid(self, uid: str, passphrase: str | None = None) -> "Key":
+        """Set the primary UID of the current Key
+
+        Args:
+            uid (str): User ID to set as primary
+            passphrase (str | None, optional): Key passphrase, if required. Defaults to None.
+
+        Raises:
+            ExecutionError: If command execution fails
+
+        Returns:
+            Key: An updated reference to the Key
+        """
+        cmd = "gpg --batch --pinentry-mode loopback --passphrase-fd 0 --quick-set-primary-uid '{fingerprint}' '{uid}'".format(
+            fingerprint=self.fingerprint, uid=uid
+        ).strip()
+        proc = self.session.run(
+            cmd,
+            input=passphrase + "\n" if passphrase else None,
+        )
         if proc.code == 0:
             return self.reload()
         else:
diff --git a/scratchpad.py b/scratchpad.py
index 29341a1..908572a 100644
--- a/scratchpad.py
+++ b/scratchpad.py
@@ -4,10 +4,7 @@
 
 with TemporaryDirectory(dir="tmp", delete=False) as tmpdir:
     gpg = GPG(homedir=tmpdir, kill_existing_agent=True)
-    key = gpg.keys.generate_key("Bongus", passphrase="test-signed")
-    key_signer = gpg.keys.generate_key("Signer", passphrase="test-signer")
-    key_signer.sign_key(key, password="test-signer")
-    key.revoke_signature(key_signer, passphrase="test-signed")
-    time.sleep(2)
-    key_signer.sign_key(key, password="test-signer")
+    key = gpg.keys.generate_key("Bongus", passphrase="test")
+    key.add_user_id(uid="New Prime", passphrase="test")
+    key.set_primary_uid("New Prime", passphrase="test")
     print(key.model_dump_json(indent=4))
diff --git a/tests/test_op_keys.py b/tests/test_op_keys.py
index dfbe22e..f77dee5 100644
--- a/tests/test_op_keys.py
+++ b/tests/test_op_keys.py
@@ -112,3 +112,12 @@ def test_revoke_sig(environment):
     assert len(keys[0].valid_signatures) == 2
     keys[0].revoke_signature(keys[1], passphrase="test-psk-1")
     assert len(keys[0].valid_signatures) == 1
+
+
+def test_set_primary_uid(environment):
+    key = environment.keys.list_keys()[3]
+
+    key.add_user_id(uid="New Primary")
+    assert len(key.user_ids) == 2
+    key.set_primary_uid("New Primary")
+    assert key.user_ids[0].uid == "New Primary"