diff --git a/.changeset/three-olives-explain.md b/.changeset/three-olives-explain.md
new file mode 100644
index 0000000000000..79e14c63c8cbc
--- /dev/null
+++ b/.changeset/three-olives-explain.md
@@ -0,0 +1,5 @@
+---
+"@rocket.chat/apps-engine": patch
+---
+
+Fixes an issue where apps where not able to update messages using the BlockBuilder.
diff --git a/packages/apps-engine/deno-runtime/lib/accessors/builders/MessageBuilder.ts b/packages/apps-engine/deno-runtime/lib/accessors/builders/MessageBuilder.ts
index d4005e3ec52b3..b549b5174032d 100644
--- a/packages/apps-engine/deno-runtime/lib/accessors/builders/MessageBuilder.ts
+++ b/packages/apps-engine/deno-runtime/lib/accessors/builders/MessageBuilder.ts
@@ -223,12 +223,10 @@ export class MessageBuilder implements IMessageBuilder {
     }
 
     public setBlocks(blocks: BlockBuilder | Array<IBlock | LayoutBlock>) {
-        if (blocks instanceof BlockBuilder) {
-            this.msg.blocks = blocks.getBlocks();
-        } else {
-            this.msg.blocks = blocks;
-            this.changes.blocks = blocks;
-        }
+        const blockArray: Array<IBlock | LayoutBlock> = blocks instanceof BlockBuilder ? blocks.getBlocks() : blocks;
+
+        this.msg.blocks = blockArray;
+        this.changes.blocks = blockArray;
 
         return this as IMessageBuilder;
     }