diff --git a/changelog.md b/changelog.md
index 69aee6fc..7c0b235a 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,11 @@
+Upcoming (TBD)
+==============
+
+Breaking Changes
+--------
+* Remove support for deprecated environment variable `$MYSQL_UNIX_PORT`.
+
+
 1.75.0 (2026/06/20)
 ==============
 
diff --git a/mycli/cli_runner.py b/mycli/cli_runner.py
index 6b35e657..a5deb9d7 100644
--- a/mycli/cli_runner.py
+++ b/mycli/cli_runner.py
@@ -97,17 +97,6 @@ def run_from_cli_args(cli_args: 'CliArgs', client_factory: ClientFactory) -> Non
     if cli_args.list_ssh_config:
         sys.exit(main_list_ssh_config(mycli, cli_args))
 
-    if 'MYSQL_UNIX_PORT' in os.environ:
-        # deprecated 2026-03
-        click.secho(
-            "The MYSQL_UNIX_PORT environment variable is deprecated in favor of MYSQL_UNIX_SOCKET.  "
-            "MYSQL_UNIX_PORT will be removed in a future release.",
-            err=True,
-            fg="red",
-        )
-        if not cli_args.socket:
-            cli_args.socket = os.environ['MYSQL_UNIX_PORT']
-
     if 'DSN' in os.environ:
         # deprecated 2026-03
         click.secho(
diff --git a/test/pytests/test_cli_runner.py b/test/pytests/test_cli_runner.py
index ed9a44ca..c634e436 100644
--- a/test/pytests/test_cli_runner.py
+++ b/test/pytests/test_cli_runner.py
@@ -118,33 +118,6 @@ def test_run_from_cli_args_rejects_conflicting_format_flags(
     assert secho_calls == [(message, {'err': True, 'fg': 'red'})]
 
 
-def test_run_from_cli_args_uses_deprecated_mysql_unix_port_and_database_alias(
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
-    cli_args = make_cli_args()
-    cli_args.database = 'prod'
-    client = DummyMyCli(
-        config={
-            **default_config(),
-            'alias_dsn': {'prod': 'mysql://dsn_user:dsn_pass@dsn_host:3307/dsn_db'},
-        }
-    )
-    secho_calls: list[str] = []
-    monkeypatch.setenv('MYSQL_UNIX_PORT', '/tmp/mysql.sock')
-    monkeypatch.setattr(cli_runner.click, 'secho', lambda text, **_kwargs: secho_calls.append(text))
-
-    run_with_client(monkeypatch, cli_args, client)
-
-    assert client.dsn_alias == 'prod'
-    assert client.connect_calls[-1]['database'] == 'dsn_db'
-    assert client.connect_calls[-1]['user'] == 'dsn_user'
-    assert client.connect_calls[-1]['passwd'] == 'dsn_pass'
-    assert client.connect_calls[-1]['host'] == 'dsn_host'
-    assert client.connect_calls[-1]['port'] == 3307
-    assert client.connect_calls[-1]['socket'] == '/tmp/mysql.sock'
-    assert any('MYSQL_UNIX_PORT environment variable is deprecated' in call for call in secho_calls)
-
-
 def test_run_from_cli_args_reports_missing_dsn(monkeypatch: pytest.MonkeyPatch) -> None:
     cli_args = make_cli_args()
     cli_args.dsn = 'missing'
@@ -165,6 +138,26 @@ def test_run_from_cli_args_reports_missing_dsn(monkeypatch: pytest.MonkeyPatch)
     ]
 
 
+def test_run_from_cli_args_treats_database_as_dsn_alias(monkeypatch: pytest.MonkeyPatch) -> None:
+    cli_args = make_cli_args()
+    cli_args.database = 'prod'
+    client = DummyMyCli(
+        config={
+            **default_config(),
+            'alias_dsn': {'prod': 'mysql://u:p@h/db'},
+        }
+    )
+
+    run_with_client(monkeypatch, cli_args, client)
+
+    assert client.dsn_alias == 'prod'
+    connect_call = client.connect_calls[-1]
+    assert connect_call['user'] == 'u'
+    assert connect_call['passwd'] == 'p'
+    assert connect_call['host'] == 'h'
+    assert connect_call['database'] == 'db'
+
+
 def test_run_from_cli_args_maps_dsn_ssl_parameters(monkeypatch: pytest.MonkeyPatch) -> None:
     cli_args = make_cli_args()
     cli_args.dsn = (