diff --git a/stac_fastapi/elasticsearch/setup.py b/stac_fastapi/elasticsearch/setup.py
index 6397898b..196cd26a 100644
--- a/stac_fastapi/elasticsearch/setup.py
+++ b/stac_fastapi/elasticsearch/setup.py
@@ -16,6 +16,7 @@
     "elasticsearch[async]",
     "elasticsearch-dsl",
     "pystac[validation]",
+    "uvicorn",
 ]
 
 extra_reqs = {
diff --git a/stac_fastapi/mongo/setup.py b/stac_fastapi/mongo/setup.py
index 20587c02..f0737ca1 100644
--- a/stac_fastapi/mongo/setup.py
+++ b/stac_fastapi/mongo/setup.py
@@ -15,6 +15,7 @@
     "fastapi-utils",
     "pymongo",
     "pystac[validation]",
+    "uvicorn",
 ]
 
 extra_reqs = {
diff --git a/stac_fastapi/mongo/stac_fastapi/mongo/serializers.py b/stac_fastapi/mongo/stac_fastapi/mongo/serializers.py
index d016fcb3..ff098e49 100644
--- a/stac_fastapi/mongo/stac_fastapi/mongo/serializers.py
+++ b/stac_fastapi/mongo/stac_fastapi/mongo/serializers.py
@@ -63,6 +63,9 @@ def db_to_stac(cls, collection: dict, base_url: str) -> stac_types.Collection:
         if original_links:
             collection_links += resolve_links(original_links, base_url)
 
+        if "providers" not in collection:
+            collection["providers"] = {}
+
         return stac_types.Collection(
             type="Collection",
             id=collection["id"],
diff --git a/stac_fastapi/mongo/stac_fastapi/mongo/version.py b/stac_fastapi/mongo/stac_fastapi/mongo/version.py
index 3c7bccdd..27ab2a3f 100644
--- a/stac_fastapi/mongo/stac_fastapi/mongo/version.py
+++ b/stac_fastapi/mongo/stac_fastapi/mongo/version.py
@@ -1,2 +1,2 @@
 """library version."""
-__version__ = "2.3.0"
+__version__ = "2.3.1"