diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 545be23..a470a59 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.19.4"
+  ".": "1.19.5"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f3249c..5a4518d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.19.5 (2026-02-26)
+
+Full Changelog: [v1.19.4...v1.19.5](https://github.com/OneBusAway/python-sdk/compare/v1.19.4...v1.19.5)
+
+### Chores
+
+* **internal:** make `test_proxy_environment_variables` more resilient to env ([e583264](https://github.com/OneBusAway/python-sdk/commit/e583264585805a1f82d86dc004c34c5eb1bb3bac))
+
 ## 1.19.4 (2026-02-24)
 
 Full Changelog: [v1.19.3...v1.19.4](https://github.com/OneBusAway/python-sdk/compare/v1.19.3...v1.19.4)
diff --git a/pyproject.toml b/pyproject.toml
index 1761896..07da016 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "onebusaway"
-version = "1.19.4"
+version = "1.19.5"
 description = "The official Python library for the onebusaway-sdk API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/onebusaway/_version.py b/src/onebusaway/_version.py
index 822ea3d..1773491 100644
--- a/src/onebusaway/_version.py
+++ b/src/onebusaway/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "onebusaway"
-__version__ = "1.19.4"  # x-release-please-version
+__version__ = "1.19.5"  # x-release-please-version
diff --git a/tests/test_client.py b/tests/test_client.py
index fafc02b..0940f79 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -953,8 +953,14 @@ def retry_handler(_request: httpx.Request) -> httpx.Response:
     def test_proxy_environment_variables(self, monkeypatch: pytest.MonkeyPatch) -> None:
         # Test that the proxy environment variables are set correctly
         monkeypatch.setenv("HTTPS_PROXY", "https://example.org")
-        # Delete in case our environment has this set
+        # Delete in case our environment has any proxy env vars set
         monkeypatch.delenv("HTTP_PROXY", raising=False)
+        monkeypatch.delenv("ALL_PROXY", raising=False)
+        monkeypatch.delenv("NO_PROXY", raising=False)
+        monkeypatch.delenv("http_proxy", raising=False)
+        monkeypatch.delenv("https_proxy", raising=False)
+        monkeypatch.delenv("all_proxy", raising=False)
+        monkeypatch.delenv("no_proxy", raising=False)
 
         client = DefaultHttpxClient()
 
@@ -1858,8 +1864,14 @@ async def test_get_platform(self) -> None:
     async def test_proxy_environment_variables(self, monkeypatch: pytest.MonkeyPatch) -> None:
         # Test that the proxy environment variables are set correctly
         monkeypatch.setenv("HTTPS_PROXY", "https://example.org")
-        # Delete in case our environment has this set
+        # Delete in case our environment has any proxy env vars set
         monkeypatch.delenv("HTTP_PROXY", raising=False)
+        monkeypatch.delenv("ALL_PROXY", raising=False)
+        monkeypatch.delenv("NO_PROXY", raising=False)
+        monkeypatch.delenv("http_proxy", raising=False)
+        monkeypatch.delenv("https_proxy", raising=False)
+        monkeypatch.delenv("all_proxy", raising=False)
+        monkeypatch.delenv("no_proxy", raising=False)
 
         client = DefaultAsyncHttpxClient()