diff --git a/docs/docs/reference/environment-variables.md b/docs/docs/reference/environment-variables.md
index fcb777708..31a94e903 100644
--- a/docs/docs/reference/environment-variables.md
+++ b/docs/docs/reference/environment-variables.md
@@ -115,6 +115,7 @@ For more details on the options below, refer to the [server deployment](../guide
 - `DSTACK_SERVER_GCP_LOGGING_PROJECT`{ #DSTACK_SERVER_GCP_LOGGING_PROJECT } – The GCP Logging project for storing workloads logs. If not set, the default file-based log storage is used.
 - `DSTACK_ENABLE_PROMETHEUS_METRICS`{ #DSTACK_ENABLE_PROMETHEUS_METRICS } — Enables Prometheus metrics collection and export.
 - `DSTACK_DEFAULT_SERVICE_CLIENT_MAX_BODY_SIZE`{ #DSTACK_DEFAULT_SERVICE_CLIENT_MAX_BODY_SIZE } – Request body size limit for services running with a gateway, in bytes. Defaults to 64 MiB.
+- `DSTACK_SERVICE_CLIENT_TIMEOUT`{ #DSTACK_SERVICE_CLIENT_TIMEOUT } – Timeout in seconds for HTTP requests sent from the in-server proxy and gateways to service replicas. Defaults to 60.
 - `DSTACK_FORBID_SERVICES_WITHOUT_GATEWAY`{ #DSTACK_FORBID_SERVICES_WITHOUT_GATEWAY } – Forbids registering new services without a gateway if set to any value.
 - `DSTACK_SERVER_CODE_UPLOAD_LIMIT`{ #DSTACK_SERVER_CODE_UPLOAD_LIMIT } - The repo size limit when uploading diffs or local repos, in bytes. Set to `0` to disable size limits. Defaults to `2MiB`.
 - `DSTACK_SERVER_S3_BUCKET`{ #DSTACK_SERVER_S3_BUCKET } - The bucket that repo diffs will be uploaded to if set. If unset, diffs are uploaded to the database.
diff --git a/src/dstack/_internal/proxy/lib/services/service_connection.py b/src/dstack/_internal/proxy/lib/services/service_connection.py
index 6c1cc49af..dc94cb27f 100644
--- a/src/dstack/_internal/proxy/lib/services/service_connection.py
+++ b/src/dstack/_internal/proxy/lib/services/service_connection.py
@@ -19,12 +19,14 @@
 from dstack._internal.proxy.lib.models import Project, Replica, Service
 from dstack._internal.proxy.lib.repo import BaseProxyRepo
 from dstack._internal.utils.common import get_or_error
+from dstack._internal.utils.env import environ
 from dstack._internal.utils.logging import get_logger
 from dstack._internal.utils.path import FileContent
 
 logger = get_logger(__name__)
 OPEN_TUNNEL_TIMEOUT = 10
-HTTP_TIMEOUT = 60  # Same as default Nginx proxy timeout
+HTTP_TIMEOUT = environ.get_int("DSTACK_SERVICE_CLIENT_TIMEOUT", default=60)
+# Same as default Nginx proxy timeout; override via DSTACK_SERVICE_CLIENT_TIMEOUT
 
 
 class ServiceClient(httpx.AsyncClient):