diff --git a/backend/engine/requirements.txt b/backend/engine/requirements.txt
index 5cca1211..41d07a1a 100644
--- a/backend/engine/requirements.txt
+++ b/backend/engine/requirements.txt
@@ -23,4 +23,6 @@ pyarrow==17.0.0
 fastparquet==2024.5.0
 aiohttp==3.10.10
 # find my epc
-beautifulsoup4
\ No newline at end of file
+beautifulsoup4
+# HTTP client (epc_client module)
+httpx==0.28.1
\ No newline at end of file
diff --git a/backend/epc_client/requirements.txt b/backend/epc_client/requirements.txt
index aa69c38b..cee32373 100644
--- a/backend/epc_client/requirements.txt
+++ b/backend/epc_client/requirements.txt
@@ -1 +1 @@
-httpx>=0.27.0
+httpx==0.28.1