diff --git a/slack-ui-no-upgrade/GX.Slack.UI.NoUpgrade.js b/slack-ui-no-upgrade/GX.Slack.UI.NoUpgrade.js
new file mode 100644
index 0000000..b2750b3
--- /dev/null
+++ b/slack-ui-no-upgrade/GX.Slack.UI.NoUpgrade.js
@@ -0,0 +1,12 @@
+/*
+==UserCSS==
+@name             GX.Slack.UI.NoUpgrade
+@match            https://app.slack.com/client/*
+@version          1.0
+==/UserCSS==
+*/
+
+.p-client_container .p-client_workspace .p-view_contents--sidebar div.p-ia4_upgrade_button__container {
+  /* opacity: 0.25; */
+  display: none;
+}