diff --git a/changelog.d/20251029_161954_severine.bonnechere_use_http_adapter_for_concurrency.md b/changelog.d/20251029_161954_severine.bonnechere_use_http_adapter_for_concurrency.md
new file mode 100644
index 0000000000..31ab931950
--- /dev/null
+++ b/changelog.d/20251029_161954_severine.bonnechere_use_http_adapter_for_concurrency.md
@@ -0,0 +1,3 @@
+### Added
+
+- A HTTPAdapter with wider parameters has been setup to better address scanning multiple files at the same time.
diff --git a/ggshield/core/client.py b/ggshield/core/client.py
index 01d9558635..efb84da49b 100644
--- a/ggshield/core/client.py
+++ b/ggshield/core/client.py
@@ -7,6 +7,7 @@
 from pygitguardian import GGClient, GGClientCallbacks
 from pygitguardian.models import APITokensResponse, Detail, TokenScope
 from requests import Session
+from requests.adapters import HTTPAdapter
 
 from . import ui
 from .config import Config
@@ -101,6 +102,12 @@ def create_session(allow_self_signed: bool = False) -> Session:
         )
         urllib3.disable_warnings()
         session.verify = False
+    # Mount HTTPAdapter with larger pool sizes for better concurrency
+    adapter = HTTPAdapter(
+        pool_maxsize=100,  # default 10
+    )
+    session.mount("http://", adapter)
+    session.mount("https://", adapter)
     return session
 
 
diff --git a/tests/unit/core/test_client.py b/tests/unit/core/test_client.py
index 32054d4033..f3e6aa6737 100644
--- a/tests/unit/core/test_client.py
+++ b/tests/unit/core/test_client.py
@@ -9,7 +9,11 @@
 from pygitguardian import GGClient
 from pygitguardian.models import APITokensResponse, Detail, TokenScope
 
-from ggshield.core.client import check_client_api_key, create_client_from_config
+from ggshield.core.client import (
+    check_client_api_key,
+    create_client_from_config,
+    create_session,
+)
 from ggshield.core.config import Config
 from ggshield.core.errors import (
     APIKeyCheckError,
@@ -239,3 +243,37 @@ def test_retrieve_client_unknown_custom_dashboard_url(isolated_fs: FakeFilesyste
             config = Config()
             config.cmdline_instance_name = "https://example.com"
             create_client_from_config(config)
+
+
+def test_create_session_pool_configuration():
+    """
+    GIVEN create_session is called
+    WHEN the session is created
+    THEN the HTTPAdapter has the correct pool configuration
+    """
+    session = create_session()
+
+    adapter = session.get_adapter("https://example.com")
+
+    # Verify pool configuration by checking the init parameters
+    assert getattr(adapter, "_pool_maxsize", None) == 100
+
+
+@pytest.mark.parametrize("allow_self_signed", [True, False])
+def test_create_session_with_self_signed_option(allow_self_signed: bool):
+    """
+    GIVEN create_session is called with allow_self_signed parameter
+    WHEN the session is created
+    THEN HTTPAdapter is mounted regardless of allow_self_signed value
+    AND verify is set correctly
+    """
+    session = create_session(allow_self_signed=allow_self_signed)
+
+    # Verify adapters are mounted
+    assert "https://" in session.adapters
+
+    # Verify SSL verification setting
+    if allow_self_signed:
+        assert session.verify is False
+    else:
+        assert session.verify is True