diff --git a/CHANGELOG.md b/CHANGELOG.md
index 315cb7372..6b3551621 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -126,6 +126,7 @@
 - Updated AP Inbox, fixes #3332. ([f8931dc7](https://github.com/pixelfed/pixelfed/commit/f8931dc7))
 - Updated AdminReportController, add account delete button. ([563817a9](https://github.com/pixelfed/pixelfed/commit/563817a9))
 - Updated ApiV1Controller, added /api/v2/media endpoint, fixes #3405 ([f07cc14c](https://github.com/pixelfed/pixelfed/commit/f07cc14c))
+- Updated AP fanout, added Content-Type and User-Agent for activity delivery ([@noellabo](https://github.com/noellabo)) ([209c125](https://github.com/pixelfed/pixelfed/commit/209c125))
 -  ([](https://github.com/pixelfed/pixelfed/commit/))
 
 ## [v0.11.2 (2022-01-09)](https://github.com/pixelfed/pixelfed/compare/v0.11.1...v0.11.2)
diff --git a/app/Jobs/DeletePipeline/FanoutDeletePipeline.php b/app/Jobs/DeletePipeline/FanoutDeletePipeline.php
index e1a9a6d11..a5ee65ac3 100644
--- a/app/Jobs/DeletePipeline/FanoutDeletePipeline.php
+++ b/app/Jobs/DeletePipeline/FanoutDeletePipeline.php
@@ -63,7 +63,12 @@ class FanoutDeletePipeline implements ShouldQueue
 
         $requests = function($audience) use ($client, $activity, $profile, $payload) {
             foreach($audience as $url) {
-                $headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
                 yield function() use ($client, $url, $headers, $payload) {
                     return $client->postAsync($url, [
                         'curl' => [
diff --git a/app/Jobs/SharePipeline/SharePipeline.php b/app/Jobs/SharePipeline/SharePipeline.php
index 5425ce972..1534a9f07 100644
--- a/app/Jobs/SharePipeline/SharePipeline.php
+++ b/app/Jobs/SharePipeline/SharePipeline.php
@@ -129,7 +129,12 @@ class SharePipeline implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/SharePipeline/UndoSharePipeline.php b/app/Jobs/SharePipeline/UndoSharePipeline.php
index 04b2ede26..589a34fef 100644
--- a/app/Jobs/SharePipeline/UndoSharePipeline.php
+++ b/app/Jobs/SharePipeline/UndoSharePipeline.php
@@ -92,7 +92,12 @@ class UndoSharePipeline implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/StatusPipeline/StatusActivityPubDeliver.php b/app/Jobs/StatusPipeline/StatusActivityPubDeliver.php
index 759f5c72c..21295beb2 100644
--- a/app/Jobs/StatusPipeline/StatusActivityPubDeliver.php
+++ b/app/Jobs/StatusPipeline/StatusActivityPubDeliver.php
@@ -87,7 +87,12 @@ class StatusActivityPubDeliver implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/StatusPipeline/StatusDelete.php b/app/Jobs/StatusPipeline/StatusDelete.php
index 7ae3a822a..e0dc2a71c 100644
--- a/app/Jobs/StatusPipeline/StatusDelete.php
+++ b/app/Jobs/StatusPipeline/StatusDelete.php
@@ -144,7 +144,12 @@ class StatusDelete implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/StoryPipeline/StoryDelete.php b/app/Jobs/StoryPipeline/StoryDelete.php
index a66fafd4f..8f4353e50 100644
--- a/app/Jobs/StoryPipeline/StoryDelete.php
+++ b/app/Jobs/StoryPipeline/StoryDelete.php
@@ -108,7 +108,12 @@ class StoryDelete implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/StoryPipeline/StoryExpire.php b/app/Jobs/StoryPipeline/StoryExpire.php
index 52e1c8e6c..494d0d5da 100644
--- a/app/Jobs/StoryPipeline/StoryExpire.php
+++ b/app/Jobs/StoryPipeline/StoryExpire.php
@@ -125,7 +125,12 @@ class StoryExpire implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Jobs/StoryPipeline/StoryFanout.php b/app/Jobs/StoryPipeline/StoryFanout.php
index 28073fe37..12f37cbf0 100644
--- a/app/Jobs/StoryPipeline/StoryFanout.php
+++ b/app/Jobs/StoryPipeline/StoryFanout.php
@@ -79,7 +79,13 @@ class StoryFanout implements ShouldQueue
 
 		$requests = function($audience) use ($client, $activity, $profile, $payload) {
 			foreach($audience as $url) {
-				$headers = HttpSignature::sign($profile, $url, $activity);
+				$version = config('pixelfed.version');
+				$appUrl = config('app.url');
+				$proxy = config('');
+				$headers = HttpSignature::sign($profile, $url, $activity, [
+					'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+					'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+				]);
 				yield function() use ($client, $url, $headers, $payload) {
 					return $client->postAsync($url, [
 						'curl' => [
diff --git a/app/Services/ActivityPubDeliveryService.php b/app/Services/ActivityPubDeliveryService.php
index 00d6aa629..ead3316ed 100644
--- a/app/Services/ActivityPubDeliveryService.php
+++ b/app/Services/ActivityPubDeliveryService.php
@@ -49,7 +49,12 @@ class ActivityPubDeliveryService
 
 		$body = $this->payload;
 		$payload = json_encode($body);
-		$headers = HttpSignature::sign($this->sender, $this->to, $body);
+		$version = config('pixelfed.version');
+		$appUrl = config('app.url');
+		$headers = HttpSignature::sign($this->sender, $this->to, $body, [
+			'Content-Type'	=> 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+			'User-Agent'	=> "(Pixelfed/{$version}; +{$appUrl})",
+		]);
 
 		$ch = curl_init($this->to);
 		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);