diff --git a/package.json b/package.json
index 6c40f28..6c96130 100644
--- a/package.json
+++ b/package.json
@@ -153,6 +153,7 @@
     "prop-types": "^15.7.2"
   },
   "peerDependencies": {
-    "react": "^15.0.0 || ^16.0.0 || ^17.0.0"
+    "react": "^15.0.0 || ^16.0.0 || ^17.0.0",
+    "@material-ui/core": "^4.0.0"
   }
 }
diff --git a/src/core.js b/src/core.js
index fbfeae1..80c7908 100644
--- a/src/core.js
+++ b/src/core.js
@@ -118,13 +118,6 @@ export function createPopupState({
         if (!parentPopupState.isOpen) return
         parentPopupState._setChildPopupState(popupState)
       }
-      if (
-        !disableAutoFocus &&
-        typeof document === 'object' &&
-        document.activeElement
-      ) {
-        document.activeElement.blur()
-      }
 
       const newState: $Shape<CoreState> = {
         isOpen: true,