diff --git a/package.json b/package.json
index 1febc03..693d2b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@afosto/instant-search-client",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "private": false,
   "description": "The Afosto InstantSearch client",
   "main": "./dist/afosto-instant-search.min.js",
diff --git a/src/adapters/SearchRequestAdapter.js b/src/adapters/SearchRequestAdapter.js
index 8da8670..9a04509 100644
--- a/src/adapters/SearchRequestAdapter.js
+++ b/src/adapters/SearchRequestAdapter.js
@@ -119,6 +119,7 @@ const SearchRequestAdapter = () => {
         indices: [request.indexName],
         q: query,
         threshold: options.threshold || DEFAULT_OPTIONS.threshold,
+        session_id: request.session_id,
         __queryID: request.__queryID,
         ...pagination,
       }];
diff --git a/src/afostoInstantSearch.js b/src/afostoInstantSearch.js
index 0a42bf5..f441067 100644
--- a/src/afostoInstantSearch.js
+++ b/src/afostoInstantSearch.js
@@ -1,6 +1,7 @@
 import { v4 as uuid } from 'uuid';
 import { SearchResponseAdapter, SearchRequestAdapter } from './adapters';
 import { DEFAULT_OPTIONS } from './constants';
+import getSessionID from './utils/getSessionID';
 
 /**
  * Afosto instant search client
@@ -18,6 +19,7 @@ const afostoInstantSearch = (searchEngineKey, options = {}) => {
   const url = clientOptions.baseUrl?.replace('{key}', searchEngineKey);
   const searchRequestAdapter = SearchRequestAdapter();
   const searchResponseAdapter = SearchResponseAdapter();
+  const sessionID = getSessionID();
 
   const getSettings = async () => {
     try {
@@ -56,7 +58,7 @@ const afostoInstantSearch = (searchEngineKey, options = {}) => {
 
   const search = async requests => {
     try {
-      const searchRequests = requests.map(request => ({ ...request, __queryID: uuid() }));
+      const searchRequests = requests.map(request => ({ ...request, session_id: sessionID, __queryID: uuid() }));
       const searchContexts = searchRequestAdapter.transform(searchRequests, clientOptions);
       const [searchRequestContext] = searchContexts;
 
diff --git a/src/constants.js b/src/constants.js
index 6e32495..48a5b0a 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -18,3 +18,5 @@ export const OPERATOR_CONVERSION = {
   '<=': 'lte',
   '=': 'in',
 };
+
+export const SESSION_KEY = 'afostoInstantSearch_sessionID';
diff --git a/src/utils/getSessionID.js b/src/utils/getSessionID.js
new file mode 100644
index 0000000..e9b4e13
--- /dev/null
+++ b/src/utils/getSessionID.js
@@ -0,0 +1,21 @@
+import { v4 as uuid } from 'uuid';
+import { SESSION_KEY } from '../constants';
+
+const getSessionID = () => {
+  const hasSessionStorage = !!window.sessionStorage;
+
+  if (!hasSessionStorage) {
+    return uuid();
+  }
+
+  let sessionID = sessionStorage.getItem(SESSION_KEY);
+
+  if (!sessionID) {
+    sessionID = uuid();
+    sessionStorage.setItem(SESSION_KEY, sessionID);
+  }
+
+  return sessionID;
+};
+
+export default getSessionID;