diff --git a/example/Example.java b/example/Example.java
index 678782cc..772aad5b 100644
--- a/example/Example.java
+++ b/example/Example.java
@@ -221,6 +221,20 @@ public static void main(String[] args) throws Exception {
         // playerFeed.addActivity(activity);
         userFeed.addActivity(activity);
 
+        // Get activities sorted by the ranking method along with externalRankingVars
+        Map<String, Object> mp=new LinkedHashMap();
+
+        mp.put("boolVal",true);
+        mp.put("music",1);
+        mp.put("sports",2.1);
+        mp.put("string","str");
+        response = userFeed.feed.getActivities(
+                new Limit(69),
+                new Offset(13),
+                DefaultOptions.DEFAULT_FILTER,
+                "rank",
+                new RankingVars(mp)
+        );
         /* -------------------------------------------------------- */
 
         // Batch following many feeds
diff --git a/src/main/java/io/getstream/client/FlatFeed.java b/src/main/java/io/getstream/client/FlatFeed.java
index 1f7ef366..f10e8824 100644
--- a/src/main/java/io/getstream/client/FlatFeed.java
+++ b/src/main/java/io/getstream/client/FlatFeed.java
@@ -8,8 +8,10 @@
 import io.getstream.core.models.FeedID;
 import io.getstream.core.options.*;
 import io.getstream.core.utils.DefaultOptions;
+
 import java.io.IOException;
 import java.util.List;
+
 import java8.util.concurrent.CompletableFuture;
 import java8.util.concurrent.CompletionException;
 
@@ -104,6 +106,28 @@ limit, offset, filter, DefaultOptions.DEFAULT_MARKER, new Ranking(ranking)
             });
   }
 
+  CompletableFuture<List<Activity>> getActivities(
+      Limit limit, Offset offset, Filter filter, String ranking, RankingVars rankingVars) throws StreamException {
+
+    final RequestOption[] options =
+        ranking == null
+            ? new RequestOption[] {limit, offset, filter, DefaultOptions.DEFAULT_MARKER}
+            : new RequestOption[] {
+              limit, offset, filter, DefaultOptions.DEFAULT_MARKER, new Ranking(ranking), rankingVars
+            };
+    return getClient()
+        .getActivities(getID(), options)
+        .thenApply(
+            response -> {
+              try {
+                return deserializeContainer(response, Activity.class);
+              } catch (StreamException | IOException e) {
+                throw new CompletionException(e);
+              }
+            });
+  }
+
+
   public <T> CompletableFuture<List<T>> getCustomActivities(Class<T> type) throws StreamException {
     return getCustomActivities(
         type,
diff --git a/src/main/java/io/getstream/core/options/RankingVars.java b/src/main/java/io/getstream/core/options/RankingVars.java
new file mode 100644
index 00000000..3bb06286
--- /dev/null
+++ b/src/main/java/io/getstream/core/options/RankingVars.java
@@ -0,0 +1,36 @@
+package io.getstream.core.options;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.getstream.core.http.Request;
+import java8.util.concurrent.CompletionException;
+
+import java.io.IOException;
+import java.util.Map;
+
+public final class RankingVars implements RequestOption{
+
+    private final String rankingVarsJSON;
+
+    public RankingVars(Map<String, Object> externalVars) {
+        String rankingVarsJSON;
+        try {
+            ObjectMapper objectMapper = new ObjectMapper();
+            rankingVarsJSON = objectMapper.writeValueAsString(externalVars);
+        }
+        catch (IOException e){
+            throw new CompletionException(e);
+        }
+
+        this.rankingVarsJSON = rankingVarsJSON;
+    }
+
+    public String getRankingVars() {
+        return rankingVarsJSON;
+    }
+
+    @Override
+    public void apply(Request.Builder builder) {
+        builder.addQueryParameter("ranking_vars", rankingVarsJSON);
+    }
+}
+
diff --git a/src/test/java/io/getstream/client/ClientTest.java b/src/test/java/io/getstream/client/ClientTest.java
index 017250d5..242a2340 100644
--- a/src/test/java/io/getstream/client/ClientTest.java
+++ b/src/test/java/io/getstream/client/ClientTest.java
@@ -6,11 +6,13 @@
 import io.getstream.core.http.HTTPClient;
 import io.getstream.core.http.Request;
 import io.getstream.core.http.Response;
-import io.getstream.core.options.EnrichmentFlags;
-import io.getstream.core.options.Filter;
-import io.getstream.core.options.Limit;
-import io.getstream.core.options.Offset;
+import io.getstream.core.options.*;
+
 import java.net.URL;
+import java.util.Map;
+import java.util.LinkedHashMap;
+
+import io.getstream.core.utils.DefaultOptions;
 import java8.util.concurrent.CompletableFuture;
 import org.junit.Test;
 
@@ -155,6 +157,37 @@ public void enrichedFeedURL() throws Exception {
     assertNull(httpClient.lastRequest.getBody());
   }
 
+  @Test
+  public void feedURLExternalRanking() throws Exception {
+    MockHTTPClient httpClient = new MockHTTPClient();
+    Client client = Client.builder(apiKey, secret).httpClient(httpClient).build();
+    FlatFeed feed = client.flatFeed("flat", "1");
+
+    Map<String, Object> mp=new LinkedHashMap();
+
+    mp.put("boolVal",true);
+    mp.put("music",1);
+    mp.put("sports",2.1);
+    mp.put("string","str");
+    feed.getActivities(
+        new Limit(69),
+        new Offset(13),
+            DefaultOptions.DEFAULT_FILTER,
+        "rank",
+        new RankingVars(mp)
+    );
+
+    assertNotNull(httpClient.lastRequest);
+    URL feedURL =
+        new URL(
+            "https://us-east-api.stream-io-api.com:443/api/v1.0/feed/flat/1/?api_key="
+                + apiKey
+                + "&limit=69&offset=13&ranking=rank&ranking_vars=%7B%22boolVal%22:true,%22music%22:1,%22sports%22:2.1,%22string%22:%22str%22%7D");
+    assertEquals(httpClient.lastRequest.getURL(), feedURL);
+    assertEquals(httpClient.lastRequest.getMethod(), Request.Method.GET);
+    assertNull(httpClient.lastRequest.getBody());
+  }
+
   @Test
   public void feedFollowURL() throws Exception {
     MockHTTPClient httpClient = new MockHTTPClient();