diff --git a/pyproject.toml b/pyproject.toml
index 1e53ac58..95489ae1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ name = "tractor"
 version = "0.1.0a6dev0"
 description = 'structured concurrent `trio`-"actors"'
 authors = [{ name = "Tyler Goodlet", email = "goodboy_foss@protonmail.com" }]
-requires-python = ">= 3.11"
+requires-python = ">=3.11, <3.14"
 readme = "docs/README.rst"
 license = "AGPL-3.0-or-later"
 keywords = [
@@ -60,7 +60,8 @@ dev = [
 ]
 devx = [
   # `tractor.devx` tooling
-  "greenback>=1.2.1,<2",
+  "greenback>=1.3,<2",
+  # ^XXX, `greenlet` borked on py314?
   "stackscope>=0.2.2,<0.3",
   # ^ requires this?
   "typing-extensions>=4.14.1",
diff --git a/uv.lock b/uv.lock
index a781e60a..90270d77 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,6 +1,6 @@
 version = 1
 revision = 3
-requires-python = ">=3.11"
+requires-python = ">=3.11, <3.14"
 
 [[package]]
 name = "attrs"
@@ -88,16 +88,16 @@ wheels = [
 
 [[package]]
 name = "greenback"
-version = "1.2.1"
+version = "1.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "greenlet" },
     { name = "outcome" },
     { name = "sniffio" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/dc/c1/ab3a42c0f3ed56df9cd33de1539b3198d98c6ccbaf88a73d6be0b72d85e0/greenback-1.2.1.tar.gz", hash = "sha256:de3ca656885c03b96dab36079f3de74bb5ba061da9bfe3bb69dccc866ef95ea3", size = 42597, upload-time = "2024-02-20T21:23:13.239Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/3b/d2/3b70d0f03a1e0f48d4f2348de435fa282e5530ae60812fef672cabc40a28/greenback-1.3.0.tar.gz", hash = "sha256:d1441f542ec9c6efb32a9250dd954a5b1cc1eb789294c19b1eb747f49cab818c", size = 8070613, upload-time = "2025-12-23T01:49:33.582Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/71/d0/b8dc79d5ecfffacad9c844b6ae76b9c6259935796d3c561deccbf8fa421d/greenback-1.2.1-py3-none-any.whl", hash = "sha256:98768edbbe4340091a9730cf64a683fcbaa3f2cb81e4ac41d7ed28d3b6f74b79", size = 28062, upload-time = "2024-02-20T21:23:12.031Z" },
+    { url = "https://files.pythonhosted.org/packages/80/41/a1b338d80775c47f79cd7310d57ad4b98730f0656b15464a57dab821c5bb/greenback-1.3.0-py3-none-any.whl", hash = "sha256:b0a333a35b40f422981ebdeefc7e0a00568f2ac634604d0108cc8c30da9b6252", size = 29079, upload-time = "2025-12-23T01:49:31.81Z" },
 ]
 
 [[package]]
@@ -465,7 +465,7 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "greenback", specifier = ">=1.2.1,<2" },
+    { name = "greenback", specifier = ">=1.3,<2" },
     { name = "pexpect", specifier = ">=4.9.0,<5" },
     { name = "prompt-toolkit", specifier = ">=3.0.50" },
     { name = "psutil", specifier = ">=7.0.0" },
@@ -476,7 +476,7 @@ dev = [
     { name = "xonsh", specifier = ">=0.19.2" },
 ]
 devx = [
-    { name = "greenback", specifier = ">=1.2.1,<2" },
+    { name = "greenback", specifier = ">=1.3,<2" },
     { name = "stackscope", specifier = ">=0.2.2,<0.3" },
     { name = "typing-extensions", specifier = ">=4.14.1" },
 ]