diff --git a/emmental/sidebar/icon.py b/emmental/sidebar/icon.py
index e8f33fa..c328748 100644
--- a/emmental/sidebar/icon.py
+++ b/emmental/sidebar/icon.py
@@ -4,9 +4,9 @@ import pathlib
 from gi.repository import GObject
 from gi.repository import GLib
 from gi.repository import Gio
-from gi.repository import Gdk
 from gi.repository import Gtk
 from gi.repository import Adw
+from .. import texture
 
 
 IMAGE_FILTERS = Gio.ListStore()
@@ -37,11 +37,7 @@ class Icon(Adw.Bin):
         self.set_child(self._icon)
 
     def __notify_filepath(self, icon: Adw.Bin, param) -> None:
-        if self.filepath is None:
-            texture = None
-        else:
-            texture = Gdk.Texture.new_from_filename(str(self.filepath))
-        self._icon.set_custom_image(texture)
+        self._icon.set_custom_image(texture.CACHE[self.filepath])
 
 
 class Settable(Icon):
@@ -61,7 +57,9 @@ class Settable(Icon):
     def __async_ready(self, dialog: Gtk.FileDialog, task: Gio.Task) -> None:
         try:
             file = dialog.open_finish(task)
-            self.filepath = pathlib.Path(file.get_path())
+            path = pathlib.Path(file.get_path())
+            texture.CACHE.drop(path)
+            self.filepath = path
         except GLib.Error:
             self.filepath = None
 
diff --git a/tests/sidebar/test_icon.py b/tests/sidebar/test_icon.py
index 409df1c..7d777bc 100644
--- a/tests/sidebar/test_icon.py
+++ b/tests/sidebar/test_icon.py
@@ -69,18 +69,14 @@ class TestIcon(unittest.TestCase):
         """Test the filepath property."""
         self.assertIsNone(self.icon.filepath)
 
-        with unittest.mock.patch("gi.repository.Gdk.Texture.new_from_filename",
-                                 wraps=Gdk.Texture.new_from_filename) \
-                as mock_new:
-            self.icon.filepath = tests.util.COVER_JPG
-            mock_new.assert_called_with(str(tests.util.COVER_JPG))
-            self.assertIsInstance(self.icon._icon.get_custom_image(),
-                                  Gdk.Texture)
+        self.icon.filepath = tests.util.COVER_JPG
+        texture = self.icon._icon.get_custom_image()
+        self.assertIsInstance(texture, Gdk.Texture)
+        self.assertDictEqual(emmental.texture.CACHE,
+                             {tests.util.COVER_JPG: texture})
 
-            mock_new.reset_mock()
-            self.icon.filepath = None
-            self.assertIsNone(self.icon._icon.get_custom_image())
-            mock_new.assert_not_called()
+        self.icon.filepath = None
+        self.assertIsNone(self.icon._icon.get_custom_image())
 
 
 class TestSettable(unittest.TestCase):
@@ -123,11 +119,15 @@ class TestSettable(unittest.TestCase):
             task = Gio.Task()
             cover_path = str(tests.util.COVER_JPG)
             mock_finish.return_value = Gio.File.new_for_path(cover_path)
+            emmental.texture.CACHE[tests.util.COVER_JPG] = "abcde"
 
             self.icon._Settable__async_ready(self.icon._dialog, task)
             mock_finish.assert_called_with(task)
             self.assertEqual(self.icon.filepath, tests.util.COVER_JPG)
 
+            texture = emmental.texture.CACHE[tests.util.COVER_JPG]
+            self.assertIsInstance(texture, Gdk.Texture)
+
     def test_clearing(self):
         """Test clearing the icon by canceling the FileDialog."""
         mock_set_initial_file = unittest.mock.Mock()