diff --git a/stac_fastapi/elasticsearch/setup.py b/stac_fastapi/elasticsearch/setup.py
index 9239d4fa..f6e28790 100644
--- a/stac_fastapi/elasticsearch/setup.py
+++ b/stac_fastapi/elasticsearch/setup.py
@@ -21,7 +21,7 @@
         "pre-commit",
         "requests",
         "ciso8601",
-        "httpx",
+        "httpx<=0.27.2",
     ],
     "docs": ["mkdocs", "mkdocs-material", "pdocs"],
     "server": ["uvicorn[standard]==0.19.0"],
diff --git a/stac_fastapi/opensearch/setup.py b/stac_fastapi/opensearch/setup.py
index 3ea0b9ca..b6ebd70b 100644
--- a/stac_fastapi/opensearch/setup.py
+++ b/stac_fastapi/opensearch/setup.py
@@ -21,7 +21,7 @@
         "pre-commit",
         "requests",
         "ciso8601",
-        "httpx",
+        "httpx<=0.27.2",
     ],
     "docs": ["mkdocs", "mkdocs-material", "pdocs"],
     "server": ["uvicorn[standard]==0.19.0"],