diff --git a/CHANGELOG.md b/CHANGELOG.md
index 090056f..3d4e12d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ All notable changes to `winuvloop` are documented here.
 - Add formatting and bytecode compilation checks to CI.
 - Add upstream issue routing links and stronger pull request guidance.
 - Include tests and maintenance docs in the source distribution.
+- Keep Python 3.9 development installs on the compatible Twine line so
+  Dependabot security updates can resolve.
 
 ## 0.2.1 - 2026-04-25
 
diff --git a/pyproject.toml b/pyproject.toml
index 25bc6c5..84f96c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -71,8 +71,8 @@ dev = [
   "pytest>=8.3.5,<9; python_version < '3.10'",
   "pytest>=9.0.3; python_version >= '3.10'",
   "ruff>=0.15.12",
-  "twine>=5.1.1,<6; python_version < '3.9'",
-  "twine>=6.2.0; python_version >= '3.9'",
+  "twine>=5.1.1,<6; python_version < '3.10'",
+  "twine>=6.2.0; python_version >= '3.10'",
 ]
 
 [tool.uv]
diff --git a/uv.lock b/uv.lock
index 3a74800..459096c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -427,7 +427,7 @@ name = "id"
 version = "1.6.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "urllib3", version = "2.6.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9'" },
+    { name = "urllib3", version = "2.6.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/6d/04/c2156091427636080787aac190019dc64096e56a23b7364d3c1764ee3a06/id-1.6.1.tar.gz", hash = "sha256:d0732d624fb46fd4e7bc4e5152f00214450953b9e772c182c1c22964def1a069", size = 18088, upload-time = "2026-02-04T16:19:41.26Z" }
 wheels = [
@@ -1218,18 +1218,25 @@ name = "twine"
 version = "5.1.1"
 source = { registry = "https://pypi.org/simple" }
 resolution-markers = [
+    "python_full_version == '3.9.*'",
     "python_full_version < '3.9'",
 ]
 dependencies = [
     { name = "importlib-metadata", version = "8.5.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
+    { name = "importlib-metadata", version = "8.7.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
     { name = "keyring", version = "25.5.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-    { name = "pkginfo", marker = "python_full_version < '3.9'" },
+    { name = "keyring", version = "25.7.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
+    { name = "pkginfo", marker = "python_full_version < '3.10'" },
     { name = "readme-renderer", version = "43.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
+    { name = "readme-renderer", version = "44.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
     { name = "requests", version = "2.32.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-    { name = "requests-toolbelt", marker = "python_full_version < '3.9'" },
-    { name = "rfc3986", marker = "python_full_version < '3.9'" },
+    { name = "requests", version = "2.32.5", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
+    { name = "requests-toolbelt", marker = "python_full_version < '3.10'" },
+    { name = "rfc3986", marker = "python_full_version < '3.10'" },
     { name = "rich", version = "14.3.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
+    { name = "rich", version = "15.0.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
     { name = "urllib3", version = "2.2.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
+    { name = "urllib3", version = "2.6.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/77/68/bd982e5e949ef8334e6f7dcf76ae40922a8750aa2e347291ae1477a4782b/twine-5.1.1.tar.gz", hash = "sha256:9aa0825139c02b3434d913545c7b847a21c835e11597f5255842d457da2322db", size = 225531, upload-time = "2024-06-26T15:00:46.58Z" }
 wheels = [
@@ -1242,20 +1249,17 @@ version = "6.2.0"
 source = { registry = "https://pypi.org/simple" }
 resolution-markers = [
     "python_full_version >= '3.10'",
-    "python_full_version == '3.9.*'",
 ]
 dependencies = [
-    { name = "id", marker = "python_full_version >= '3.9'" },
-    { name = "importlib-metadata", version = "8.7.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
-    { name = "keyring", version = "25.7.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9' and platform_machine != 'ppc64le' and platform_machine != 's390x'" },
-    { name = "packaging", marker = "python_full_version >= '3.9'" },
-    { name = "readme-renderer", version = "44.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9'" },
-    { name = "requests", version = "2.32.5", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
+    { name = "id", marker = "python_full_version >= '3.10'" },
+    { name = "keyring", version = "25.7.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10' and platform_machine != 'ppc64le' and platform_machine != 's390x'" },
+    { name = "packaging", marker = "python_full_version >= '3.10'" },
+    { name = "readme-renderer", version = "44.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
     { name = "requests", version = "2.33.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
-    { name = "requests-toolbelt", marker = "python_full_version >= '3.9'" },
-    { name = "rfc3986", marker = "python_full_version >= '3.9'" },
-    { name = "rich", version = "15.0.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9'" },
-    { name = "urllib3", version = "2.6.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9'" },
+    { name = "requests-toolbelt", marker = "python_full_version >= '3.10'" },
+    { name = "rfc3986", marker = "python_full_version >= '3.10'" },
+    { name = "rich", version = "15.0.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "urllib3", version = "2.6.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/e0/a8/949edebe3a82774c1ec34f637f5dd82d1cf22c25e963b7d63771083bbee5/twine-6.2.0.tar.gz", hash = "sha256:e5ed0d2fd70c9959770dce51c8f39c8945c574e18173a7b81802dab51b4b75cf", size = 172262, upload-time = "2025-09-04T15:43:17.255Z" }
 wheels = [
@@ -1408,8 +1412,8 @@ dev = [
     { name = "pytest", version = "8.4.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.9.*'" },
     { name = "pytest", version = "9.0.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
     { name = "ruff" },
-    { name = "twine", version = "5.1.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.9'" },
-    { name = "twine", version = "6.2.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9'" },
+    { name = "twine", version = "5.1.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },
+    { name = "twine", version = "6.2.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
 ]
 
 [package.metadata]
@@ -1425,8 +1429,8 @@ dev = [
     { name = "pytest", marker = "python_full_version < '3.10'", specifier = ">=8.3.5,<9" },
     { name = "pytest", marker = "python_full_version >= '3.10'", specifier = ">=9.0.3" },
     { name = "ruff", specifier = ">=0.15.12" },
-    { name = "twine", marker = "python_full_version < '3.9'", specifier = ">=5.1.1,<6" },
-    { name = "twine", marker = "python_full_version >= '3.9'", specifier = ">=6.2.0" },
+    { name = "twine", marker = "python_full_version < '3.10'", specifier = ">=5.1.1,<6" },
+    { name = "twine", marker = "python_full_version >= '3.10'", specifier = ">=6.2.0" },
 ]
 
 [[package]]