diff --git a/httpx/_config.py b/httpx/_config.py
index 0dc7a460..3785af98 100644
--- a/httpx/_config.py
+++ b/httpx/_config.py
@@ -367,5 +367,5 @@ class Proxy:
 
 
 DEFAULT_TIMEOUT_CONFIG = Timeout(timeout=5.0)
-DEFAULT_POOL_LIMITS = PoolLimits(soft_limit=10, hard_limit=100)
+DEFAULT_POOL_LIMITS = PoolLimits(max_keepalive=10, max_connections=100)
 DEFAULT_MAX_REDIRECTS = 20
diff --git a/httpx/_utils.py b/httpx/_utils.py
index f8faf97a..cf64d89f 100644
--- a/httpx/_utils.py
+++ b/httpx/_utils.py
@@ -404,4 +404,4 @@ def as_network_error(*exception_classes: type) -> typing.Iterator[None]:
 
 
 def warn_deprecated(message: str) -> None:
-    warnings.warn(message, DeprecationWarning)
+    warnings.warn(message, DeprecationWarning, stacklevel=2)