diff --git a/swh/indexer/metadata_dictionary/github.py b/swh/indexer/metadata_dictionary/github.py
--- a/swh/indexer/metadata_dictionary/github.py
+++ b/swh/indexer/metadata_dictionary/github.py
@@ -18,7 +18,10 @@
 
 class GitHubMapping(BaseExtrinsicMapping, JsonMapping):
     name = "github"
-    mapping = CROSSWALK_TABLE["GitHub"]
+    mapping = {
+        **CROSSWALK_TABLE["GitHub"],
+        "topics": SCHEMA.keywords,  # TODO: submit this to the official crosswalk
+    }
     string_fields = [
         "archive_url",
         "created_at",
@@ -27,6 +30,7 @@
         "full_name",
         "html_url",
         "issues_url",
+        "topics",
     ]
 
     @classmethod
diff --git a/swh/indexer/tests/metadata_dictionary/test_github.py b/swh/indexer/tests/metadata_dictionary/test_github.py
--- a/swh/indexer/tests/metadata_dictionary/test_github.py
+++ b/swh/indexer/tests/metadata_dictionary/test_github.py
@@ -38,9 +38,6 @@
 
 
 def test_compute_metadata_github():
-    """
-    testing only computation of metadata with hard_mapping_npm
-    """
     content = b"""
 {
   "id": 80521091,
@@ -140,3 +137,20 @@
         "schema:dateCreated": "2017-01-31T13:05:39Z",
         "schema:dateModified": "2022-06-22T08:02:20Z",
     }
+
+
+def test_github_topics():
+    content = b"""
+{
+  "topics": [
+    "foo",
+    "bar"
+  ]
+}
+    """
+    result = MAPPINGS["GitHubMapping"]().translate(content)
+    assert set(result.pop("keywords", [])) == {"foo", "bar"}, result
+    assert result == {
+        "@context": CONTEXT,
+        "type": "forge:Repository",
+    }