diff --git a/blueprintcompiler/language/expression.py b/blueprintcompiler/language/expression.py
index ae9c399..558392c 100644
--- a/blueprintcompiler/language/expression.py
+++ b/blueprintcompiler/language/expression.py
@@ -171,24 +171,6 @@ class LookupOp(InfixExpr):
                 did_you_mean=(self.property_name, self.lhs.type.properties.keys()),
             )
 
-    @validate("property")
-    def property_deprecated(self):
-        if self.lhs.type is None or not (
-            isinstance(self.lhs.type, gir.Class)
-            or isinstance(self.lhs.type, gir.Interface)
-        ):
-            return
-
-        if property := self.lhs.type.properties.get(self.property_name):
-            if property.deprecated:
-                hints = []
-                if property.deprecated_doc:
-                    hints.append(property.deprecated_doc)
-                raise DeprecatedWarning(
-                    f"{property.signature} is deprecated",
-                    hints=hints,
-                )
-
 
 class CastExpr(InfixExpr):
     grammar = [
diff --git a/blueprintcompiler/lsp.py b/blueprintcompiler/lsp.py
index 0659154..25b289f 100644
--- a/blueprintcompiler/lsp.py
+++ b/blueprintcompiler/lsp.py
@@ -149,7 +149,7 @@ class LanguageServer:
 
     def _send(self, data):
         data["jsonrpc"] = "2.0"
-        line = json.dumps(data, separators=(",", ":"))
+        line = json.dumps(data, separators=(",", ":")) + "\r\n"
         printerr("output: " + line)
         sys.stdout.write(
             f"Content-Length: {len(line.encode())}\r\nContent-Type: application/vscode-jsonrpc; charset=utf-8\r\n\r\n{line}"
diff --git a/tests/sample_errors/deprecations.blp b/tests/sample_errors/deprecations.blp
new file mode 100644
index 0000000..f67f002
--- /dev/null
+++ b/tests/sample_errors/deprecations.blp
@@ -0,0 +1,9 @@
+using Gtk 4.0;
+
+Dialog {
+  use-header-bar: 1;
+}
+
+Window {
+  keys-changed => $on_window_keys_changed();
+}
diff --git a/tests/sample_errors/deprecations.err b/tests/sample_errors/deprecations.err
new file mode 100644
index 0000000..e3abd61
--- /dev/null
+++ b/tests/sample_errors/deprecations.err
@@ -0,0 +1 @@
+3,1,6,Gtk.Dialog is deprecated
\ No newline at end of file
diff --git a/tests/test_deprecations.py b/tests/test_deprecations.py
deleted file mode 100644
index 0ffe726..0000000
--- a/tests/test_deprecations.py
+++ /dev/null
@@ -1,110 +0,0 @@
-# test_samples.py
-#
-# Copyright 2024 James Westman <james@jwestman.net>
-#
-# This file is free software; you can redistribute it and/or modify it
-# under the terms of the GNU Lesser General Public License as
-# published by the Free Software Foundation; either version 3 of the
-# License, or (at your option) any later version.
-#
-# This file is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# SPDX-License-Identifier: LGPL-3.0-or-later
-
-
-import unittest
-
-import gi
-
-gi.require_version("Gtk", "4.0")
-from gi.repository import Gtk
-
-from blueprintcompiler import parser, tokenizer
-from blueprintcompiler.errors import DeprecatedWarning, PrintableError
-
-# Testing deprecation warnings requires special handling because libraries can add deprecations with new versions,
-# causing tests to break if we're not careful.
-
-
-class TestDeprecations(unittest.TestCase):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
-        self.gtkVersion = f"{Gtk.get_major_version()}.{Gtk.get_minor_version()}.{Gtk.get_micro_version()}"
-
-    def assertDeprecation(self, blueprint: str, message: str):
-        try:
-            tokens = tokenizer.tokenize(blueprint)
-            _ast, errors, warnings = parser.parse(tokens)
-
-            self.assertIsNone(errors)
-            self.assertEqual(len(warnings), 1)
-            self.assertIsInstance(warnings[0], DeprecatedWarning)
-            self.assertEqual(warnings[0].message, message)
-        except PrintableError as e:  # pragma: no cover
-            e.pretty_print("<deprecations test>", blueprint)
-            raise AssertionError()
-
-    def test_class_deprecation(self):
-        if Gtk.check_version(4, 10, 0) is not None:
-            self.skipTest(f"Gtk.Dialog is not deprecated in GTK {self.gtkVersion}")
-
-        blueprint = """
-        using Gtk 4.0;
-
-        Dialog {
-            use-header-bar: 1;
-        }
-        """
-        message = "Gtk.Dialog is deprecated"
-
-        self.assertDeprecation(blueprint, message)
-
-    def test_property_deprecation(self):
-        self.skipTest(
-            "gobject-introspection does not currently write property deprecations to the typelib. See <https://gitlab.gnome.org/GNOME/gobject-introspection/-/merge_requests/410>."
-        )
-
-        if Gtk.check_version(4, 4, 0) is not None:
-            self.skipTest(
-                f"Gtk.DropTarget:drop is not deprecated in GTK {self.gtkVersion}"
-            )
-
-        blueprint = """
-        using Gtk 4.0;
-
-        $MyObject {
-            a: bind drop_target.drop;
-        }
-
-        DropTarget drop_target {
-        }
-        """
-
-        message = "Gtk.DropTarget:drop is deprecated"
-
-        self.assertDeprecation(blueprint, message)
-
-    def test_signal_deprecation(self):
-        if Gtk.check_version(4, 10, 0) is not None:
-            self.skipTest(
-                f"Gtk.Window::keys-changed is not deprecated in GTK {self.gtkVersion}"
-            )
-
-        blueprint = """
-        using Gtk 4.0;
-
-        Window {
-            keys-changed => $handler();
-        }
-        """
-
-        message = "signal Gtk.Window::keys-changed () is deprecated"
-
-        self.assertDeprecation(blueprint, message)