diff --git a/README.md b/README.md
index 485aeb6..aaa793b 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,10 @@ TODO API DEMO
 
 ## installation
 
+> **Note**  
+> python 3.11 or later is required due to a bug in earlier versions.
+> [(python/cpython#88089)](https://github.com/python/cpython/issues/88089)
+
 install surplus directly from the repository using pip:
 
 ```text
@@ -71,7 +75,7 @@ options:
 
 prerequisites:
 
-- [Python >=3.10](https://www.python.org/)
+- [Python >=3.11](https://www.python.org/)
 - [Poetry](https://python-poetry.org/)
 
 alternatively, use [devbox](https://get.jetpack.io/devbox) for a hermetic development environment powered by [Nix](https://nixos.org/).
diff --git a/poetry.lock b/poetry.lock
index 803e3fb..4f2aa86 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -82,7 +82,6 @@ packaging = ">=22.0"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
 tokenize-rt = {version = ">=3.2.0", optional = true, markers = "extra == \"jupyter\""}
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
@@ -311,7 +310,6 @@ files = [
 
 [package.dependencies]
 mypy-extensions = ">=1.0.0"
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typing-extensions = ">=4.1.0"
 
 [package.extras]
@@ -529,18 +527,6 @@ files = [
     {file = "tokenize_rt-5.2.0.tar.gz", hash = "sha256:9fe80f8a5c1edad2d3ede0f37481cc0cc1538a2f442c9c2f9e4feacd2792d054"},
 ]
 
-[[package]]
-name = "tomli"
-version = "2.0.1"
-description = "A lil' TOML parser"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
-    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
-]
-
 [[package]]
 name = "traitlets"
 version = "5.9.0"
@@ -583,5 +569,5 @@ files = [
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.10"
-content-hash = "8abdfe54d3a4b6e9a68de3e449f56ee704b9c439a23e1ef80bd3bc70a39b4137"
+python-versions = "^3.11"
+content-hash = "f9270d7fb45c708e923f4afe041b26f77becb8e4adfcd517742e67f6b8f9d6b9"
diff --git a/pyproject.toml b/pyproject.toml
index d52accf..63c17c6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ readme = "README.md"
 include = ["surplus.py"]
 
 [tool.poetry.dependencies]
-python = "^3.10"
+python = "^3.11"
 pluscodes = "^2022.1.3"
 geopy = "^2.3.0"