diff --git a/scripts/install-dev.sh b/scripts/install-dev.sh
index 19d4e4dd..46ed5288 100755
--- a/scripts/install-dev.sh
+++ b/scripts/install-dev.sh
@@ -381,6 +381,10 @@ main() {
         install_slack_cli "$@"
 
         sleep 0.1
+        >&2 echo -e "\x1b[1m⚠️  Warning: Starting on September 1, 2025, Deno will no longer be installed with this script!\x1b[0m"
+        >&2 echo -e "⚠️  Warning: Apps built with Deno should install Deno separately:"
+        >&2 echo -e "⚠️  Warning: https://docs.deno.com/runtime/getting_started/installation/"
+        echo -e ""
         install_deno
 
         echo
diff --git a/scripts/install-windows-dev.ps1 b/scripts/install-windows-dev.ps1
index e29d9c46..865e8fbb 100644
--- a/scripts/install-windows-dev.ps1
+++ b/scripts/install-windows-dev.ps1
@@ -360,6 +360,9 @@ trap {
 }
 
 install_slack_cli $Alias $Version
+[Console]::Error.WriteLine("`n`e[1mWarning: Starting on September 1, 2025, Deno will no longer be installed with this script!`e[0m")
+[Console]::Error.WriteLine("Warning: Apps built with Deno should install Deno separately:")
+[Console]::Error.WriteLine("Warning: https://docs.deno.com/runtime/getting_started/installation/")
 install_deno $SkipDeno
 Write-Host "`nAdding developer tooling for an enhanced experience..."
 install_git $SkipGit
diff --git a/scripts/install-windows.ps1 b/scripts/install-windows.ps1
index 18f28370..ca0134bd 100644
--- a/scripts/install-windows.ps1
+++ b/scripts/install-windows.ps1
@@ -351,6 +351,9 @@ trap {
 }
 
 install_slack_cli $Alias $Version
+[Console]::Error.WriteLine("`n`e[1mWarning: Starting on September 1, 2025, Deno will no longer be installed with this script!`e[0m")
+[Console]::Error.WriteLine("Warning: Apps built with Deno should install Deno separately:")
+[Console]::Error.WriteLine("Warning: https://docs.deno.com/runtime/getting_started/installation/")
 install_deno $SkipDeno
 Write-Host "`nAdding developer tooling for an enhanced experience..."
 install_git $SkipGit
diff --git a/scripts/install.sh b/scripts/install.sh
index 0e50806a..1fd1c09c 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -380,6 +380,10 @@ main() {
         install_slack_cli "$@"
 
         sleep 0.1
+        >&2 echo -e "\x1b[1m⚠️  Warning: Starting on September 1, 2025, Deno will no longer be installed with this script!\x1b[0m"
+        >&2 echo -e "⚠️  Warning: Apps built with Deno should install Deno separately:"
+        >&2 echo -e "⚠️  Warning: https://docs.deno.com/runtime/getting_started/installation/"
+        echo -e ""
         install_deno
 
         echo