diff --git a/pyproject.toml b/pyproject.toml
index 8cc66c7..babb039 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ description = "Flagsmith's common library"
 requires-python = ">=3.11,<4.0"
 dependencies = []
 optional-dependencies = { test-tools = [
-    "pyfakefs (>=5,<6)",
+    "pyfakefs (>=6,<7)",
     "pytest-django (>=4,<5)",
 ], common-core = [
     "django (>4,<6)",
@@ -72,7 +72,7 @@ dev = [
     "mypy (>=1.15.0, <2.0.0)",
     "pre-commit",
     "pydantic>=2.12.5",
-    "pyfakefs (>=5.7.4, <6.0.0)",
+    "pyfakefs (>=6.1.4, <6.2.0)",
     "pytest (>=8.3.4, <9.0.0)",
     "pytest-asyncio (>=0.25.3, <1.0.0)",
     "pytest-cov (>=6.0.0, <7.0.0)",
diff --git a/uv.lock b/uv.lock
index e9ee190..e6bd85e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -468,7 +468,7 @@ requires-dist = [
     { name = "prometheus-client", marker = "extra == 'common-core'", specifier = ">=0.0.16" },
     { name = "prometheus-client", marker = "extra == 'task-processor'", specifier = ">=0.0.16" },
     { name = "psycopg2-binary", marker = "extra == 'common-core'", specifier = ">=2.9,<3" },
-    { name = "pyfakefs", marker = "extra == 'test-tools'", specifier = ">=5,<6" },
+    { name = "pyfakefs", marker = "extra == 'test-tools'", specifier = ">=6,<7" },
     { name = "pytest-django", marker = "extra == 'test-tools'", specifier = ">=4,<5" },
     { name = "requests", marker = "extra == 'common-core'" },
     { name = "simplejson", marker = "extra == 'common-core'", specifier = ">=3,<4" },
@@ -485,7 +485,7 @@ dev = [
     { name = "mypy", specifier = ">=1.15.0,<2.0.0" },
     { name = "pre-commit" },
     { name = "pydantic", specifier = ">=2.12.5" },
-    { name = "pyfakefs", specifier = ">=5.7.4,<6.0.0" },
+    { name = "pyfakefs", specifier = ">=6.1.4,<6.2.0" },
     { name = "pytest", specifier = ">=8.3.4,<9.0.0" },
     { name = "pytest-asyncio", specifier = ">=0.25.3,<1.0.0" },
     { name = "pytest-cov", specifier = ">=6.0.0,<7.0.0" },
@@ -1064,11 +1064,11 @@ wheels = [
 
 [[package]]
 name = "pyfakefs"
-version = "5.10.2"
+version = "6.1.4"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/58/1c/4b9489847535a41e074d108bfb86119ab463aa3012f4cb8f6b7f9154e00a/pyfakefs-5.10.2.tar.gz", hash = "sha256:8ae0e5421e08de4e433853a4609a06a1835f4bc2a3ce13b54f36713a897474ba", size = 231379, upload-time = "2025-11-04T20:19:04.446Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/76/11/efd26f319da2a170f42594efdd387df9abdbd3c213deb2251d602d9b8e2d/pyfakefs-6.1.4.tar.gz", hash = "sha256:58d5902282085e8ff03f95316ce133858904096f7adbe622efef899b90695698", size = 226757, upload-time = "2026-03-04T18:02:29.62Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b0/65/3a15447a8630a6bb79cf1ecd9e323a72b28830cb9f367494bedcd045059d/pyfakefs-5.10.2-py3-none-any.whl", hash = "sha256:6ff0e84653a71efc6a73f9ee839c3141e3a7cdf4e1fb97666f82ac5b24308d64", size = 246305, upload-time = "2025-11-04T20:19:02.583Z" },
+    { url = "https://files.pythonhosted.org/packages/6b/0f/8fbdc47cfda8ab497b21ad66220407201ed2fc2de91640151b62bc6571af/pyfakefs-6.1.4-py3-none-any.whl", hash = "sha256:46bbc7520a1524af2461ddcaf4a5a800596c750bfdb75afa1afd985bf1e39536", size = 239887, upload-time = "2026-03-04T18:02:28.029Z" },
 ]
 
 [[package]]