diff --git a/pyproject.toml b/pyproject.toml
index 203d0045..2ad5fb13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ optional-dependencies = { test-tools = [
     "djangorestframework",
     "drf-spectacular (>=0.28.0,<1)",
     "drf-writable-nested",
-    "environs (<15)",
+    "environs (<16)",
     "gunicorn (>=19.1)",
     "inflection",
     "opentelemetry-api (>=1.25,<2)",
diff --git a/uv.lock b/uv.lock
index 5c07061d..3594a02e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -427,15 +427,15 @@ wheels = [
 
 [[package]]
 name = "environs"
-version = "14.5.0"
+version = "15.0.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "marshmallow" },
     { name = "python-dotenv" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/aa/75/06801d5beeb398ed3903167af9376bb81c4ac41c44a53d45193065ebb1a8/environs-14.5.0.tar.gz", hash = "sha256:f7b8f6fcf3301bc674bc9c03e39b5986d116126ffb96764efd34c339ed9464ee", size = 35426, upload-time = "2025-11-02T21:30:36.78Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/c5/f4/0273d36ab287a00866b69d4008e2ed2e479e4bc1eef4f8be2708f30ad15f/environs-15.0.1.tar.gz", hash = "sha256:638106bfb5d8c9a13ee51c23a9f2416baf9a748c8e537fec771102927cd02aa8", size = 36385, upload-time = "2026-04-06T14:15:12.676Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d3/f3/6961beb9a1e77d01dee1dd48f00fb3064429c8abcfa26aa863eb7cb2b6dd/environs-14.5.0-py3-none-any.whl", hash = "sha256:1abd3e3a5721fb09797438d6c902bc2f35d4580dfaffe68b8ee588b67b504e13", size = 17202, upload-time = "2025-11-02T21:30:35.186Z" },
+    { url = "https://files.pythonhosted.org/packages/49/fb/11e461eb609792f9f439398eb5f400fb4130ff2b9b59e0ceb346bb830a17/environs-15.0.1-py3-none-any.whl", hash = "sha256:a6aeb3e18d5649a4e74f62984f0d84ec869269cff588a43685272c72b5b8979b", size = 17357, upload-time = "2026-04-06T14:15:11.118Z" },
 ]
 
 [[package]]
@@ -528,7 +528,7 @@ requires-dist = [
     { name = "djangorestframework-recursive", marker = "extra == 'common-core'" },
     { name = "drf-spectacular", marker = "extra == 'common-core'", specifier = ">=0.28.0,<1" },
     { name = "drf-writable-nested", marker = "extra == 'common-core'" },
-    { name = "environs", marker = "extra == 'common-core'", specifier = "<15" },
+    { name = "environs", marker = "extra == 'common-core'", specifier = "<16" },
     { name = "flagsmith-flag-engine", marker = "extra == 'flagsmith-schemas'", specifier = ">6" },
     { name = "gunicorn", marker = "extra == 'common-core'", specifier = ">=19.1" },
     { name = "inflection", marker = "extra == 'common-core'" },