diff --git a/bin/omarchy-upgrade-to-quattro b/bin/omarchy-upgrade-to-quattro
index 32ea6465..7c5292cd 100755
--- a/bin/omarchy-upgrade-to-quattro
+++ b/bin/omarchy-upgrade-to-quattro
@@ -1328,7 +1328,7 @@ apply_system_transition() {
       '
   fi
   as_root install -d -m 0755 /usr/lib/chromium
-  printf '%s\n' '{"browser":{"theme":{"color_scheme":0,"color_scheme2":0}}}' | \
+  printf '%s\n' '{"distribution":{"require_eula":false},"browser":{"theme":{"color_scheme":0,"color_scheme2":0}}}' | \
     as_root tee /usr/lib/chromium/initial_preferences >/dev/null
 
   # Deliberately do NOT add the user to the docker group. That group is
diff --git a/install/config/theme-system.sh b/install/config/theme-system.sh
index 83db0e15..1527e17e 100644
--- a/install/config/theme-system.sh
+++ b/install/config/theme-system.sh
@@ -6,7 +6,8 @@ ln -snf /usr/share/icons/Adwaita/symbolic/actions/go-next-symbolic.svg \
           /usr/share/icons/Yaru/scalable/actions/go-next-symbolic.svg
 gtk-update-icon-cache /usr/share/icons/Yaru &>/dev/null || true
 
-# Default Chromium to follow system appearance ("device") instead of dark
+# Seed Chromium's first run: follow system appearance ("device") instead of dark,
+# and skip the terms-of-service dialog Chromium 151 turned on by default.
 mkdir -p /usr/lib/chromium
-echo '{"browser":{"theme":{"color_scheme":0,"color_scheme2":0}}}' > \
+echo '{"distribution":{"require_eula":false},"browser":{"theme":{"color_scheme":0,"color_scheme2":0}}}' > \
   /usr/lib/chromium/initial_preferences
diff --git a/migrations/1787691200.sh b/migrations/1787691200.sh
new file mode 100644
index 00000000..71c163e5
--- /dev/null
+++ b/migrations/1787691200.sh
@@ -0,0 +1,18 @@
+echo "Skip Chromium's new first-run EULA on machines already on Quattro"
+
+# Chromium 151 flipped MasterPrefs::eula_required from false to true, so an
+# unconfigured first run now stops on a blank terms-of-service dialog before the
+# browser opens. Omarchy answers that in the seed it writes next to the Chromium
+# binary, but that seed is only laid down by a fresh install and by the one-time
+# 3.x upgrade, so machines already on Quattro never receive it. Retrofit it here.
+#
+# The literal is deliberately duplicated rather than sourced: a migration repairs
+# the state of its own moment, and must not drift when the seed later changes.
+
+chromium_prefs="/usr/lib/chromium/initial_preferences"
+chromium_seed='{"distribution":{"require_eula":false},"browser":{"theme":{"color_scheme":0,"color_scheme2":0}}}'
+
+if [[ $(cat "$chromium_prefs" 2>/dev/null) != "$chromium_seed" ]]; then
+  sudo mkdir -p "$(dirname "$chromium_prefs")"
+  echo "$chromium_seed" | sudo tee "$chromium_prefs" >/dev/null
+fi