diff --git a/test-cases/simple-chat-update-message.binproto b/test-cases/simple-chat-update-message.binproto
index c8ee14d..dc6f83a 100644
Binary files a/test-cases/simple-chat-update-message.binproto and b/test-cases/simple-chat-update-message.binproto differ
diff --git a/test-cases/simple-chat-update-message.jsonproto b/test-cases/simple-chat-update-message.jsonproto
index 798b600..6966039 100644
--- a/test-cases/simple-chat-update-message.jsonproto
+++ b/test-cases/simple-chat-update-message.jsonproto
@@ -1,4 +1,6 @@
-// Includes at least one message for each of the "simple chat updates".
+// Includes at least one message for each of the "simple chat updates",
+// excluding "release notes" messages that aren't supported on all platforms
+// yet.
 [
   {
     "backupTimeMs": "123456",
@@ -71,24 +73,17 @@
       }
     }
   },
-  // Release Notes channel
-  {
-    "chat": {
-      "id": "1",
-      "recipientId": "2"
-    }
-  },
   // 1:1 chat with Contact recipient 4
   {
     "chat": {
-      "id": "2",
+      "id": "1",
       "recipientId": "4"
     }
   },
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "1",
       "directionless": {},
       "updateMessage": {
@@ -101,7 +96,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "2",
       "directionless": {},
       "updateMessage": {
@@ -114,7 +109,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "3",
       "directionless": {},
       "updateMessage": {
@@ -127,7 +122,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "4",
       "directionless": {},
       "updateMessage": {
@@ -137,23 +132,10 @@
       }
     }
   },
-  {
-    "chatItem": {
-      "authorId": "2",
-      "chatId": "1",
-      "dateSent": "5",
-      "directionless": {},
-      "updateMessage": {
-        "simpleUpdate": {
-          "type": "RELEASE_CHANNEL_DONATION_REQUEST"
-        }
-      }
-    }
-  },
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "6",
       "directionless": {},
       "updateMessage": {
@@ -166,7 +148,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "7",
       "directionless": {},
       "updateMessage": {
@@ -179,7 +161,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "8",
       "directionless": {},
       "updateMessage": {
@@ -192,7 +174,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "9",
       "directionless": {},
       "updateMessage": {
@@ -205,7 +187,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "10",
       "directionless": {},
       "updateMessage": {
@@ -218,7 +200,7 @@
   {
     "chatItem": {
       "authorId": "1",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "11",
       "directionless": {},
       "updateMessage": {
@@ -231,7 +213,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "12",
       "directionless": {},
       "updateMessage": {
@@ -244,7 +226,7 @@
   {
     "chatItem": {
       "authorId": "1",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "13",
       "directionless": {},
       "updateMessage": {
@@ -257,7 +239,7 @@
   {
     "chatItem": {
       "authorId": "4",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "14",
       "directionless": {},
       "updateMessage": {
@@ -270,7 +252,7 @@
   {
     "chatItem": {
       "authorId": "1",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "14",
       "directionless": {},
       "updateMessage": {
@@ -283,7 +265,7 @@
   {
     "chatItem": {
       "authorId": "1",
-      "chatId": "2",
+      "chatId": "1",
       "dateSent": "15",
       "directionless": {},
       "updateMessage": {
diff --git a/test-cases/simple-chat-update-release-notes-donation-request.binproto b/test-cases/simple-chat-update-release-notes-donation-request.binproto
new file mode 100644
index 0000000..e9b0cdf
Binary files /dev/null and b/test-cases/simple-chat-update-release-notes-donation-request.binproto differ
diff --git a/test-cases/simple-chat-update-release-notes-donation-request.jsonproto b/test-cases/simple-chat-update-release-notes-donation-request.jsonproto
new file mode 100644
index 0000000..52fb1fb
--- /dev/null
+++ b/test-cases/simple-chat-update-release-notes-donation-request.jsonproto
@@ -0,0 +1,80 @@
+// Includes "release notes" simple chat updates.
+[
+  {
+    "backupTimeMs": "123456",
+    "version": "1"
+  },
+  {
+    "account": {
+      "profileKey": "YQKRq+3DQklInaOaMcmlzZnN0m/1hzLiaONX7gB12dg=",
+      "givenName": "Boba",
+      "familyName": "Fett",
+      "avatarUrlPath": "",
+      "accountSettings": {
+        "readReceipts": false,
+        "sealedSenderIndicators": true,
+        "typingIndicators": false,
+        "linkPreviews": false,
+        "notDiscoverableByPhoneNumber": false,
+        "preferContactAvatars": false,
+        "universalExpireTimerSeconds": 0,
+        "preferredReactionEmoji": [],
+        "displayBadgesOnProfile": false,
+        "keepMutedChatsArchived": false,
+        "hasSetMyStoriesPrivacy": false,
+        "hasViewedOnboardingStory": false,
+        "storiesDisabled": false,
+        "storyViewReceiptsEnabled": false,
+        "hasSeenGroupStoryEducationSheet": false,
+        "hasCompletedUsernameOnboarding": false,
+        "phoneNumberSharingMode": "NOBODY"
+      }
+    }
+  },
+  {
+    "recipient": {
+      "id": "1",
+      "self": {}
+    }
+  },
+  {
+    "recipient": {
+      "id": "2",
+      "releaseNotes": {}
+    }
+  },
+  {
+    "recipient": {
+      "id": "3",
+      "distributionList": {
+        "distributionId": "AAAAAAAAAAAAAAAAAAAAAA==",
+        "distributionList": {
+          "allowReplies": true,
+          "memberRecipientIds": [],
+          "name": "My Story",
+          "privacyMode": "ALL"
+        }
+      }
+    }
+  },
+  // Release Notes channel
+  {
+    "chat": {
+      "id": "1",
+      "recipientId": "2"
+    }
+  },
+  {
+    "chatItem": {
+      "authorId": "2",
+      "chatId": "1",
+      "dateSent": "5",
+      "directionless": {},
+      "updateMessage": {
+        "simpleUpdate": {
+          "type": "RELEASE_CHANNEL_DONATION_REQUEST"
+        }
+      }
+    }
+  },
+]