diff --git a/src/main/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializer.java b/src/main/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializer.java
index 8f145d901..885dabc80 100644
--- a/src/main/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializer.java
+++ b/src/main/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializer.java
@@ -145,7 +145,7 @@ public static String getEntry(Object input) {
     /**
      * Serialize object to a string
      *
-     * @param input           can be any object or collection of objects.
+     * @param input           can be any object or collection/map of objects.
      * @param useObjectMapper if true, then use Jackson's ObjectMapper to convert from object to string,
      *                        otherwise use toString
      * @return serialized object
@@ -154,19 +154,16 @@ public static String getEntry(Object input) {
     public static String getEntry(Object input, boolean useObjectMapper) {
         if (input == null) {
             return null;
-        }
-        if (input instanceof Collection<?>) {
-            StringJoiner joiner = new StringJoiner(", ", "[ ", " ]");
-            for (Object collectionEntry : (Collection<?>) input) {
-                joiner.add(getEntry(collectionEntry, useObjectMapper));
-            }
-            return joiner.toString();
-        }
-        if (useObjectMapper) {
+        } else if (useObjectMapper) {
             return objectMapperWriteValueAsString(input);
-        }
-        if (input instanceof Enum<?>) {
-            return input.toString();
+        } else if (input instanceof Collection<?>) {
+            return serializeCollection((Collection<?>) input, useObjectMapper);
+        } else if (input instanceof Map<?, ?>) {
+            return serializeMap((Map<?, ?>) input, useObjectMapper);
+        } else if (input instanceof Map.Entry<?, ?>) {
+            return serializeMapEntry((Map.Entry<?, ?>) input, useObjectMapper);
+        } else if (input instanceof Enum<?>) {
+            return serializeEnum((Enum<?>) input);
         } else if (input instanceof String) {
             return escapeJsonString(input.toString());
         } else if (input.getClass().getName().equals("scala.Some")) { // TODO: move to Scala Serializer
@@ -180,13 +177,29 @@ public static String getEntry(Object input, boolean useObjectMapper) {
         }
     }
 
+    public static String serializeCollection(Collection<?> input, boolean useObjectMapper) {
+        StringJoiner joiner = new StringJoiner(", ", "[ ", " ]");
+        for (Object entry : input) {
+            joiner.add(getEntry(entry, useObjectMapper));
+        }
+        return joiner.toString();
+    }
 
-    public static String objectMapperWriteValueAsString(Object input) {
-        try {
-            return OBJECT_MAPPER.writeValueAsString(input);
-        } catch (JsonProcessingException e) {
-            throw new UnableToBuildJsonQueryException(e);
+    public static String serializeMap(Map<?, ?> input, boolean useObjectMapper) {
+        StringJoiner joiner = new StringJoiner(", ", "{ ", " }");
+        for (Map.Entry<?, ?> entry : input.entrySet()) {
+            joiner.add(getEntry(entry, useObjectMapper));
         }
+        return joiner.toString();
+    }
+
+    public static String serializeMapEntry(Map.Entry<?, ?> input, boolean useObjectMapper) {
+        // no need to quote String key
+        return input.getKey() + ": " + getEntry(input.getValue(), useObjectMapper);
+    }
+
+    public static String serializeEnum(Enum<?> input) {
+        return input.toString();
     }
 
     /**
@@ -231,4 +244,12 @@ public static String escapeJsonString(String stringValue) {
         return sb.toString();
     }
 
+    public static String objectMapperWriteValueAsString(Object input) {
+        try {
+            return OBJECT_MAPPER.writeValueAsString(input);
+        } catch (JsonProcessingException e) {
+            throw new UnableToBuildJsonQueryException(e);
+        }
+    }
+
 }
diff --git a/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializerTest.java b/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializerTest.java
index 1aa928c38..aa90a4378 100644
--- a/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializerTest.java
+++ b/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/GraphQLRequestSerializerTest.java
@@ -26,6 +26,8 @@
 import java.time.ZoneOffset;
 import java.time.ZonedDateTime;
 import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Stream;
 
@@ -422,6 +424,7 @@ void serialize_collectionRequest_Null(String name, Function<GraphQLRequest, Stri
                 .setContextId("something")
                 .setIds(null)
                 .setTranslated(false)
+                .setEntries(null)
                 .build();
         GraphQLRequest graphQLRequest = new GraphQLRequest(request,
                 new EventResponseProjection()
@@ -433,6 +436,32 @@ void serialize_collectionRequest_Null(String name, Function<GraphQLRequest, Stri
         assertEquals(expectedQueryDecorator.apply(expectedQueryStr), serializedQuery);
     }
 
+    @ParameterizedTest(name = "{0}")
+    @MethodSource("provideAllSerializers")
+    void serialize_requestWithMap(String name, Function<GraphQLRequest, String> serializer,
+                                  Function<String, String> expectedQueryDecorator) {
+        Map<Object, Object> entries = new HashMap<>();
+        entries.put("entryInt", 1);
+        entries.put("entryString", "2");
+        entries.put("entryFloat", 3.3);
+        entries.put("entryNull", null);
+        EventsByIdsQueryRequest request = new EventsByIdsQueryRequest.Builder()
+                .setContextId("something")
+                .setIds(null)
+                .setTranslated(false)
+                .setEntries(entries)
+                .build();
+        GraphQLRequest graphQLRequest = new GraphQLRequest(request,
+                new EventResponseProjection()
+                        .id()
+        );
+        String serializedQuery = serializer.apply(graphQLRequest).replaceAll(" +", " ").trim();
+        String expectedQueryStr = "query eventsByIds { " +
+                "eventsByIds(contextId: \"something\", translated: false, entries: " +
+                "{ entryNull: null, entryInt: 1, entryFloat: 3.3, entryString: \"2\" }){ id } }";
+        assertEquals(expectedQueryDecorator.apply(expectedQueryStr), serializedQuery);
+    }
+
     @ParameterizedTest(name = "{0}")
     @MethodSource("provideAllSerializers")
     void serialize_AllInputsNull(String name, Function<GraphQLRequest, String> serializer,
diff --git a/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/data/EventsByIdsQueryRequest.java b/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/data/EventsByIdsQueryRequest.java
index 9964789d9..d20480962 100644
--- a/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/data/EventsByIdsQueryRequest.java
+++ b/src/test/java/com/kobylynskyi/graphql/codegen/model/graphql/data/EventsByIdsQueryRequest.java
@@ -37,6 +37,10 @@ public void setTranslated(Boolean translated) {
         this.input.put("translated", translated);
     }
 
+    public void setEntries(Map<Object, Object> entries) {
+        this.input.put("entries", entries);
+    }
+
     @Override
     public GraphQLOperation getOperationType() {
         return OPERATION_TYPE;
@@ -72,6 +76,7 @@ public static class Builder {
         private String contextId;
         private Collection<String> ids;
         private Boolean translated;
+        private Map<Object, Object> entries;
 
         public Builder() {
         }
@@ -91,12 +96,18 @@ public Builder setTranslated(Boolean translated) {
             return this;
         }
 
+        public Builder setEntries(Map<Object, Object> entries) {
+            this.entries = entries;
+            return this;
+        }
+
 
         public EventsByIdsQueryRequest build() {
             EventsByIdsQueryRequest obj = new EventsByIdsQueryRequest();
             obj.setContextId(contextId);
             obj.setIds(ids);
             obj.setTranslated(translated);
+            obj.setEntries(entries);
             return obj;
         }