diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3449ad1ba..936e5ac8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ### Widget Works Modification
 
-* [WIDGET-WORKS] Silence "Parent message not found" warnings during history sync to prevent CPU overload and subsequent 401 disconnects.
+* [WIDGET-WORKS] Patch Baileys to filter sender's own devices from senderKeyJids in LID group messages (fixes "not-acceptable" error preventing group message sends).
 * [WIDGET-WORKS] Fix `PrismaClientValidationError` in `messages.update` (missing `Message` relation) by guarding `messageUpdate.create` calls.
 * [WIDGET-WORKS] Guard `messages.update` cache cleanup with a derived key and optional `MESSAGE_UPDATE_CACHE_DELETE_DISABLED` flag to prevent cache.delete crash-loops.
 * [WIDGET-WORKS] Save messages before Chatwoot sync in `/message/sendText` to avoid missing `chatwootMessageId` and log async sync failures.
diff --git a/Dockerfile b/Dockerfile
index 2f30eea09..28e04b249 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM node:20-alpine AS builder
 
 RUN apk update && \
-    apk add --no-cache git ffmpeg wget curl bash openssl
+    apk add --no-cache git ffmpeg wget curl bash openssl patch
 
 LABEL version="2.3.2" description="Api to control whatsapp features through http requests." 
 LABEL maintainer="Davidson Gomes" git="https://github.com/DavidsonGomes"
@@ -15,6 +15,10 @@ COPY ./tsup.config.ts ./
 
 RUN npm ci --silent
 
+# [WIDGET-WORKS] Apply Baileys patch for LID group send fix
+COPY ./patches ./patches
+RUN patch -p1 < patches/baileys+6.7.19+lid-group-send.patch
+
 COPY ./src ./src
 COPY ./public ./public
 COPY ./prisma ./prisma
diff --git a/patches/baileys+6.7.19+lid-group-send.patch b/patches/baileys+6.7.19+lid-group-send.patch
new file mode 100644
index 000000000..e3e29d7f1
--- /dev/null
+++ b/patches/baileys+6.7.19+lid-group-send.patch
@@ -0,0 +1,22 @@
+diff --git a/node_modules/baileys/lib/Socket/messages-send.js b/node_modules/baileys/lib/Socket/messages-send.js
+index 1234567..abcdefg 100644
+--- a/node_modules/baileys/lib/Socket/messages-send.js
++++ b/node_modules/baileys/lib/Socket/messages-send.js
+@@ -360,8 +360,14 @@ export const makeMessagesSocket = (config) => {
+                     meId
+                 });
+                 const senderKeyJids = [];
+-                // ensure a connection is established with every device
++                // [WIDGET-WORKS] Filter sender's own devices from senderKeyJids (LID group send fix)
++                // Same pattern as non-group path (line ~396) - fixes "not-acceptable" error
++                const { user: meUser } = jidDecode(meId);
++                const meLid = authState.creds?.me?.lid?.split(':')[0]?.split('@')[0];
++                // ensure a connection is established with every device
+                 for (const { user, device } of devices) {
++                    // [WIDGET-WORKS] Skip sender's own devices
++                    if (user === meUser || user === meLid) {
++                        continue;
++                    }
+                     const jid = jidEncode(user, groupData?.addressingMode === 'lid' ? 'lid' : 's.whatsapp.net', device);
+                     if (!senderKeyMap[jid] || !!participant) {
+                         senderKeyJids.push(jid);