diff --git a/app/backend/requirements.in b/app/backend/requirements.in
index 756a857192..9ccaae4634 100644
--- a/app/backend/requirements.in
+++ b/app/backend/requirements.in
@@ -8,7 +8,7 @@ azure-ai-documentintelligence==1.0.0b4
 azure-cognitiveservices-speech
 azure-cosmos
 azure-search-documents==11.7.0b1
-azure-storage-blob
+azure-storage-blob==12.27.0
 azure-storage-file-datalake
 uvicorn
 aiohttp
diff --git a/app/backend/requirements.txt b/app/backend/requirements.txt
index 5eab109d1f..450dc60c56 100644
--- a/app/backend/requirements.txt
+++ b/app/backend/requirements.txt
@@ -58,7 +58,7 @@ azure-monitor-opentelemetry-exporter==1.0.0b44
     # via azure-monitor-opentelemetry
 azure-search-documents==11.7.0b1
     # via -r requirements.in
-azure-storage-blob==12.22.0
+azure-storage-blob==12.27.0
     # via
     #   -r requirements.in
     #   azure-storage-file-datalake
diff --git a/tests/mocks.py b/tests/mocks.py
index 6c52ee90e5..68cb665885 100644
--- a/tests/mocks.py
+++ b/tests/mocks.py
@@ -75,6 +75,29 @@ async def readinto(self, buffer: BytesIO):
         buffer.write(b"test")
 
 
+class MockContentReader:
+    """Mock content reader for aiohttp.ClientResponse"""
+    def __init__(self, body_bytes):
+        self._body = body_bytes
+        self._offset = 0
+        self._exception = None
+
+    async def read(self, n=-1):
+        if n == -1:
+            result = self._body[self._offset:]
+            self._offset = len(self._body)
+        else:
+            result = self._body[self._offset:self._offset + n]
+            self._offset += len(result)
+        return result
+
+    def exception(self):
+        return self._exception
+
+    def set_exception(self, exc):
+        self._exception = exc
+
+
 class MockAiohttpClientResponse404(aiohttp.ClientResponse):
     def __init__(self, url, body_bytes, headers=None):
         self._body = body_bytes
@@ -83,6 +106,8 @@ def __init__(self, url, body_bytes, headers=None):
         self.status = 404
         self.reason = "Not Found"
         self._url = url
+        self._loop = None
+        self.content = MockContentReader(body_bytes)
 
 
 class MockAiohttpClientResponse(aiohttp.ClientResponse):
@@ -93,6 +118,8 @@ def __init__(self, url, body_bytes, headers=None):
         self.status = 200
         self.reason = "OK"
         self._url = url
+        self._loop = None
+        self.content = MockContentReader(body_bytes)
 
 
 class MockTransport(AsyncHttpTransport):