diff --git a/cloakbrowser/download.py b/cloakbrowser/download.py
index bebfb22..471efa3 100644
--- a/cloakbrowser/download.py
+++ b/cloakbrowser/download.py
@@ -74,7 +74,7 @@ WELCOME_FREE_INTERVAL = 24 * 3600
 # Pro Chromium major shown in the free-tier welcome banner. Bump at each Pro
 # major release (there is no local constant to derive it from — the live Pro
 # version comes from the network, which we don't call just to print a banner).
-PRO_MAJOR = "150"
+PRO_MAJOR = "151"
 
 
 def _welcome_due(marker: Path, pro: bool) -> bool:
diff --git a/dotnet/src/CloakBrowser/Download.cs b/dotnet/src/CloakBrowser/Download.cs
index b85dca5..aee82b1 100644
--- a/dotnet/src/CloakBrowser/Download.cs
+++ b/dotnet/src/CloakBrowser/Download.cs
@@ -82,7 +82,7 @@ public static class Download
     // Pro Chromium major shown in the free-tier welcome banner. Bump at each Pro
     // major release (there is no local constant to derive it from - the live Pro
     // version comes from the network, which we don't call just to print a banner).
-    private const string ProMajor = "150";
+    private const string ProMajor = "151";
 
     /// <summary>
     /// Whether the welcome banner should be shown now. Pro: once ever (only when
diff --git a/js/src/download.ts b/js/src/download.ts
index c025055..8e46770 100644
--- a/js/src/download.ts
+++ b/js/src/download.ts
@@ -49,7 +49,7 @@ export const WELCOME_FREE_INTERVAL_SEC = 1 * 24 * 60 * 60;
 // Pro Chromium major shown in the welcome banner. Bump at each Pro major release
 // (no local constant to derive it from — the live Pro version comes from the
 // network, which we don't call just to print a banner). Mirrors download.py.
-const PRO_MAJOR = "150";
+const PRO_MAJOR = "151";
 
 /**
  * A downloaded binary could not be authenticated (bad/missing signature,