diff --git a/.gitignore b/.gitignore
index 1a1e3cc..663c164 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ AGENTS.md
 *.app
 *.env
 *.dmg
+*.delta
diff --git a/Gaze.xcodeproj/project.pbxproj b/Gaze.xcodeproj/project.pbxproj
index 002fdf4..62d5b39 100644
--- a/Gaze.xcodeproj/project.pbxproj
+++ b/Gaze.xcodeproj/project.pbxproj
@@ -424,7 +424,7 @@
 				CODE_SIGN_ENTITLEMENTS = Gaze/Gaze.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 2;
 				DEVELOPMENT_TEAM = 6GK4F9L62V;
 				ENABLE_APP_SANDBOX = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
@@ -460,7 +460,7 @@
 				CODE_SIGN_ENTITLEMENTS = Gaze/Gaze.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 2;
 				DEVELOPMENT_TEAM = 6GK4F9L62V;
 				ENABLE_APP_SANDBOX = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
diff --git a/build_dmg b/build_dmg
index acc471e..407d3f8 100755
--- a/build_dmg
+++ b/build_dmg
@@ -27,6 +27,7 @@ echo "📦 Building Gaze DMG for v${VERSION} (build ${BUILD_NUMBER})"
 RELEASES_DIR="./releases"
 APPCAST_OUTPUT="${RELEASES_DIR}/appcast.xml"
 FEED_URL="https://freno.me/api/Gaze/appcast.xml"
+DOWNLOAD_URL_PREFIX="https://freno.me/api/downloads/"
 DMG_NAME="Gaze-${VERSION}.dmg"
 
 # Find Sparkle generate_appcast tool
@@ -79,7 +80,7 @@ if [ -n "$SPARKLE_BIN" ] && [ -d "$SPARKLE_BIN" ]; then
     
     # Generate appcast with download URL prefix and key
     "$SPARKLE_BIN/generate_appcast" \
-        --download-url-prefix "https://freno.me/downloads/" \
+        --download-url-prefix "$DOWNLOAD_URL_PREFIX" \
         $KEY_OPTION \
         "$RELEASES_DIR"
     
@@ -106,7 +107,7 @@ if [ -n "$SPARKLE_BIN" ] && [ -d "$SPARKLE_BIN" ]; then
                 
                 # Add signature to appcast XML
                 # Find the enclosure line and add sparkle:edSignature attribute
-                sed -i '' "s|<enclosure url=\"https://freno.me/downloads/$DMG_NAME\" length=\"[0-9]*\"|<enclosure url=\"https://freno.me/downloads/$DMG_NAME\" sparkle:edSignature=\"$ED_SIGNATURE\" length=\"$FILE_LENGTH\"|g" "$APPCAST_OUTPUT"
+                sed -i '' "s|<enclosure url=\"${DOWNLOAD_URL_PREFIX}$DMG_NAME\" length=\"[0-9]*\"|<enclosure url=\"${DOWNLOAD_URL_PREFIX}$DMG_NAME\" sparkle:edSignature=\"$ED_SIGNATURE\" length=\"$FILE_LENGTH\"|g" "$APPCAST_OUTPUT"
                 
                 # Verify signature was added
                 if grep -q "edSignature" "$APPCAST_OUTPUT"; then
@@ -126,10 +127,10 @@ if [ -n "$SPARKLE_BIN" ] && [ -d "$SPARKLE_BIN" ]; then
         exit 1
     fi
 else
-    echo ""
-    echo "⚠️  Skipping appcast generation (Sparkle tools not found)"
-    echo "To generate appcast manually, run:"
-    echo "  ./generate_appcast --ed-key-file ~/sparkle_private_key_backup.pem --download-url-prefix 'https://freno.me/downloads/' '$RELEASES_DIR'"
+echo ""
+echo "⚠️  Skipping appcast generation (Sparkle tools not found)"
+echo "To generate appcast manually, run:"
+echo "  ./generate_appcast --ed-key-file ~/sparkle_private_key_backup.pem --download-url-prefix '$DOWNLOAD_URL_PREFIX' '$RELEASES_DIR'"
 fi
 
 # Upload to AWS S3 if environment variables are set
@@ -142,17 +143,36 @@ if [ -n "$AWS_ACCESS_KEY_ID" ] && [ -n "$AWS_SECRET_ACCESS_KEY" ] && [ -n "$AWS_
   export AWS_SECRET_ACCESS_KEY="$AWS_SECRET_ACCESS_KEY"
   export AWS_DEFAULT_REGION="$AWS_REGION"
   
-  # Upload DMG to S3
-  aws s3 cp "$RELEASES_DIR/$DMG_NAME" "s3://$AWS_BUCKET_NAME/downloads/$DMG_NAME" --region "$AWS_REGION"
+  # Upload all DMG files in releases directory
+  echo "Uploading DMG files..."
+  for dmg_file in "$RELEASES_DIR"/*.dmg; do
+    if [ -f "$dmg_file" ]; then
+      dmg_basename=$(basename "$dmg_file")
+      echo "  Uploading $dmg_basename..."
+      aws s3 cp "$dmg_file" "s3://$AWS_BUCKET_NAME/downloads/$dmg_basename" --region "$AWS_REGION"
+    fi
+  done
+  
+  # Upload all delta files in releases directory
+  echo "Uploading delta files..."
+  for delta_file in "$RELEASES_DIR"/*.delta; do
+    if [ -f "$delta_file" ]; then
+      delta_basename=$(basename "$delta_file")
+      echo "  Uploading $delta_basename..."
+      aws s3 cp "$delta_file" "s3://$AWS_BUCKET_NAME/downloads/$delta_basename" --region "$AWS_REGION"
+    fi
+  done
   
   # Upload appcast if it exists
   if [ -f "$APPCAST_OUTPUT" ]; then
+      echo "Uploading appcast..."
       aws s3 cp "$APPCAST_OUTPUT" "s3://$AWS_BUCKET_NAME/api/Gaze/appcast.xml" --region "$AWS_REGION"
       echo "✅ Appcast uploaded to S3"
   fi
   
   echo "✅ Upload complete!"
-  echo "  DMG: s3://$AWS_BUCKET_NAME/downloads/$DMG_NAME"
+  echo "  DMG files: s3://$AWS_BUCKET_NAME/downloads/*.dmg"
+  echo "  Delta files: s3://$AWS_BUCKET_NAME/downloads/*.delta"
   echo "  Appcast: s3://$AWS_BUCKET_NAME/api/Gaze/appcast.xml"
 else
   echo ""
@@ -168,7 +188,7 @@ if [ -f "$APPCAST_OUTPUT" ]; then
 fi
 echo ""
 echo "Next steps:"
-echo "  1. Upload DMG to: https://freno.me/downloads/$DMG_NAME"
+echo "  1. Upload DMG to: ${DOWNLOAD_URL_PREFIX}$DMG_NAME"
 echo "  2. Upload appcast to: $FEED_URL"
 echo "  3. Verify appcast is accessible and valid"
 echo "  4. Test update from previous version"
diff --git a/dmg_background.acorn b/dmg_background.acorn
index 5f67197..4c81bac 100644
Binary files a/dmg_background.acorn and b/dmg_background.acorn differ
diff --git a/dmg_background.png b/dmg_background.png
index b968e9b..7401f6d 100644
Binary files a/dmg_background.png and b/dmg_background.png differ
diff --git a/releases/appcast.xml b/releases/appcast.xml
index c640369..e16f1e8 100644
--- a/releases/appcast.xml
+++ b/releases/appcast.xml
@@ -2,13 +2,24 @@
 <rss xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" version="2.0">
     <channel>
         <title>Gaze</title>
+        <item>
+            <title>0.2.1</title>
+            <pubDate>Sun, 11 Jan 2026 19:58:11 -0500</pubDate>
+            <sparkle:version>2</sparkle:version>
+            <sparkle:shortVersionString>0.2.1</sparkle:shortVersionString>
+            <sparkle:minimumSystemVersion>14.6</sparkle:minimumSystemVersion>
+            <enclosure url="https://freno.me/api/downloads/Gaze-0.2.1.dmg" length="4832775" type="application/octet-stream" sparkle:edSignature="rIMuezCOzKhKKZV+HgJV7LNoXFkjVse82toPgSYNfp2YWO8EITVaCBr4ZP2wqXZlRfdE4J6r9BDewbkKxkf7AQ=="/>
+            <sparkle:deltas>
+                <enclosure url="https://freno.me/api/downloads/Gaze2-1.delta" sparkle:deltaFrom="1" length="94254" type="application/octet-stream" sparkle:deltaFromSparkleExecutableSize="858560" sparkle:deltaFromSparkleLocales="de,he,ar,el,ja,fa,uk" sparkle:edSignature="qfxSfqD9iVJ7GVL19V8T4OuOTz0ZgqJNceBH6W+dwoKel1R+BTPkU9Ia8xR12v07GoXkyyqc+ba79OOL7jIpBw=="/>
+            </sparkle:deltas>
+        </item>
         <item>
             <title>0.1.1</title>
             <pubDate>Sun, 11 Jan 2026 18:07:02 -0500</pubDate>
             <sparkle:version>1</sparkle:version>
             <sparkle:shortVersionString>0.2.0</sparkle:shortVersionString>
             <sparkle:minimumSystemVersion>14.6</sparkle:minimumSystemVersion>
-            <enclosure url="https://freno.me/downloads/Gaze-0.2.0.dmg" length="4831161" type="application/octet-stream" sparkle:edSignature="zCEmiiO4Q7HV7uGbI/CQcfJElm1uqrYorznE6uCWaKm/Zg1bUrWaeTRf9+Uv9f9+0iptyiS2FNdglLQB8RKkCA=="/>
+            <enclosure url="https://freno.me/api/downloads/Gaze-0.2.0.dmg" length="4831161" type="application/octet-stream" sparkle:edSignature="zCEmiiO4Q7HV7uGbI/CQcfJElm1uqrYorznE6uCWaKm/Zg1bUrWaeTRf9+Uv9f9+0iptyiS2FNdglLQB8RKkCA=="/>
         </item>
     </channel>
 </rss>
\ No newline at end of file