diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index fcc9bcc8be..b560c7e71b 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -203,8 +203,11 @@
     "Your browser does not support the required cryptography extensions": "Your browser does not support the required cryptography extensions",
     "Not a valid Riot keyfile": "Not a valid Riot keyfile",
     "Authentication check failed: incorrect password?": "Authentication check failed: incorrect password?",
+    "Sorry, your homeserver is too old to participate in this room.": "Sorry, your homeserver is too old to participate in this room.",
+    "Please contact your homeserver administrator.": "Please contact your homeserver administrator.",
     "Failed to join room": "Failed to join room",
     "Message Pinning": "Message Pinning",
+    "Increase performance by only loading room members on first view": "Increase performance by only loading room members on first view",
     "Disable Emoji suggestions while typing": "Disable Emoji suggestions while typing",
     "Use compact timeline layout": "Use compact timeline layout",
     "Hide removed messages": "Hide removed messages",
@@ -543,10 +546,6 @@
     "Internal room ID: ": "Internal room ID: ",
     "Room version number: ": "Room version number: ",
     "Add a topic": "Add a topic",
-    "There is a known vulnerability affecting this room.": "There is a known vulnerability affecting this room.",
-    "This room version is vulnerable to malicious modification of room state.": "This room version is vulnerable to malicious modification of room state.",
-    "Click here to upgrade to the latest room version and ensure room integrity is protected.": "Click here to upgrade to the latest room version and ensure room integrity is protected.",
-    "Only room administrators will see this warning": "Only room administrators will see this warning",
     "Search…": "Search…",
     "This Room": "This Room",
     "All Rooms": "All Rooms",
@@ -865,12 +864,6 @@
     "Ignore request": "Ignore request",
     "Loading device info...": "Loading device info...",
     "Encryption key request": "Encryption key request",
-    "Upgrade Room Version": "Upgrade Room Version",
-    "Upgrading this room requires closing down the current instance of the room and creating a new room it its place. To give room members the best possible experience, we will:": "Upgrading this room requires closing down the current instance of the room and creating a new room it its place. To give room members the best possible experience, we will:",
-    "Create a new room with the same name, description and avatar": "Create a new room with the same name, description and avatar",
-    "Update any local room aliases to point to the new room": "Update any local room aliases to point to the new room",
-    "Stop users from speaking in the old version of the room, and post a message advising users to move to the new room": "Stop users from speaking in the old version of the room, and post a message advising users to move to the new room",
-    "Put a link back to the old room at the start of the new room so people can see old messages": "Put a link back to the old room at the start of the new room so people can see old messages",
     "Sign out": "Sign out",
     "Log out and remove encryption keys?": "Log out and remove encryption keys?",
     "Clear Storage and Sign Out": "Clear Storage and Sign Out",
@@ -1121,6 +1114,8 @@
     "Labs": "Labs",
     "These are experimental features that may break in unexpected ways": "These are experimental features that may break in unexpected ways",
     "Use with caution": "Use with caution",
+    "Lazy loading members not supported": "Lazy loading members not supported",
+    "Lazy loading is not supported by your current homeserver.": "Lazy loading is not supported by your current homeserver.",
     "Deactivate my account": "Deactivate my account",
     "Clear Cache": "Clear Cache",
     "Clear Cache and Reload": "Clear Cache and Reload",
@@ -1231,8 +1226,5 @@
     "Import": "Import",
     "Failed to set direct chat tag": "Failed to set direct chat tag",
     "Failed to remove tag %(tagName)s from room": "Failed to remove tag %(tagName)s from room",
-    "Failed to add tag %(tagName)s to room": "Failed to add tag %(tagName)s to room",
-    "Increase performance by only loading room members on first view": "Increase performance by only loading room members on first view",
-    "Lazy loading members not supported": "Lazy load members not supported",
-    "Lazy loading is not supported by your current homeserver.": "Lazy loading is not supported by your current homeserver."
+    "Failed to add tag %(tagName)s to room": "Failed to add tag %(tagName)s to room"
 }
diff --git a/src/stores/RoomViewStore.js b/src/stores/RoomViewStore.js
index fed0d7b4a1..f15925f480 100644
--- a/src/stores/RoomViewStore.js
+++ b/src/stores/RoomViewStore.js
@@ -223,7 +223,13 @@ class RoomViewStore extends Store {
                 action: 'join_room_error',
                 err: err,
             });
-            const msg = err.message ? err.message : JSON.stringify(err);
+            let msg = err.message ? err.message : JSON.stringify(err);
+            if (err.errcode === 'M_INCOMPATIBLE_ROOM_VERSION') {
+                msg = <div>
+                    {_t("Sorry, your homeserver is too old to participate in this room.")}<br />
+                    {_t("Please contact your homeserver administrator.")}
+                </div>;
+            }
             const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
             Modal.createTrackedDialog('Failed to join room', '', ErrorDialog, {
                 title: _t("Failed to join room"),