diff --git a/Gemfile b/Gemfile
index 18845e6..c0ad280 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 
 ruby '>= 4.0'
 
-gem 'gtk4', '~> 4.2'
+gem 'gtk4', '~> 4.3'
 
 # Audio playback pipeline
 gem 'gstreamer', '~> 4.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2804dc3..e22dfe7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,17 +15,17 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
       uri (>= 0.13.1)
     ast (2.4.3)
-    atk (4.3.7)
-      glib2 (= 4.3.7)
+    atk (4.3.9)
+      glib2 (= 4.3.9)
       rake
     base64 (0.3.0)
     bigdecimal (4.1.2)
     cairo (1.18.5)
       pkg-config (>= 1.2.2)
       red-colors
-    cairo-gobject (4.3.7)
+    cairo-gobject (4.3.9)
       cairo (>= 1.16.2)
-      glib2 (= 4.3.7)
+      glib2 (= 4.3.9)
     concurrent-ruby (1.3.8)
     connection_pool (3.0.2)
     diff-lcs (1.6.2)
@@ -35,33 +35,33 @@ GEM
     faker (3.8.0)
       i18n (>= 1.8.11, < 2)
     fiddle (1.1.8)
-    gdk4 (4.3.7)
-      cairo-gobject (= 4.3.7)
-      gdk_pixbuf2 (= 4.3.7)
-      pango (= 4.3.7)
+    gdk4 (4.3.9)
+      cairo-gobject (= 4.3.9)
+      gdk_pixbuf2 (= 4.3.9)
+      pango (= 4.3.9)
       rake
-    gdk_pixbuf2 (4.3.7)
-      gio2 (= 4.3.7)
+    gdk_pixbuf2 (4.3.9)
+      gio2 (= 4.3.9)
       rake
-    gio2 (4.3.7)
+    gio2 (4.3.9)
       fiddle
-      gobject-introspection (= 4.3.7)
-    glib2 (4.3.7)
+      gobject-introspection (= 4.3.9)
+    glib2 (4.3.9)
       native-package-installer (>= 1.0.3)
       pkg-config (>= 1.3.5)
-    gobject-introspection (4.3.7)
-      glib2 (= 4.3.7)
-    graphene1 (4.3.7)
-      gobject-introspection (= 4.3.7)
-    gsk4 (4.3.7)
-      gdk4 (= 4.3.7)
-      graphene1 (= 4.3.7)
-    gstreamer (4.3.7)
-      gobject-introspection (= 4.3.7)
-    gtk4 (4.3.7)
-      atk (= 4.3.7)
-      gdk4 (= 4.3.7)
-      gsk4 (= 4.3.7)
+    gobject-introspection (4.3.9)
+      glib2 (= 4.3.9)
+    graphene1 (4.3.9)
+      gobject-introspection (= 4.3.9)
+    gsk4 (4.3.9)
+      gdk4 (= 4.3.9)
+      graphene1 (= 4.3.9)
+    gstreamer (4.3.9)
+      gobject-introspection (= 4.3.9)
+    gtk4 (4.3.9)
+      atk (= 4.3.9)
+      gdk4 (= 4.3.9)
+      gsk4 (= 4.3.9)
     i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     json (2.21.2)
@@ -74,9 +74,9 @@ GEM
       prism (~> 1.5)
     native-package-installer (1.1.9)
     ostruct (0.6.3)
-    pango (4.3.7)
-      cairo-gobject (= 4.3.7)
-      gobject-introspection (= 4.3.7)
+    pango (4.3.9)
+      cairo-gobject (= 4.3.9)
+      gobject-introspection (= 4.3.9)
     parallel (2.2.0)
     parser (3.3.12.0)
       ast (~> 2.4.1)
@@ -86,7 +86,7 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.4.2)
-    red-colors (0.4.0)
+    red-colors (0.5.0)
       json
       matrix
     regexp_parser (2.13.0)
@@ -147,7 +147,7 @@ DEPENDENCIES
   factory_bot (~> 6.2)
   faker (~> 3.2)
   gstreamer (~> 4.3)
-  gtk4 (~> 4.2)
+  gtk4 (~> 4.3)
   ostruct (~> 0.6)
   rake (~> 13.0)
   rexml (~> 3.4)