diff --git a/flake.nix b/flake.nix
index 4e010b5..16c234c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,7 +29,7 @@
         };
       in {
         devShells.default = let
-          python = pkgs.python312.withPackages (
+          python = pkgs.python311.withPackages (
             ps:
               with ps; [
                 # poetry-core
diff --git a/poetry.lock b/poetry.lock
index 58d06a4..24cf95d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -3,5 +3,5 @@ package = []
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.12"
-content-hash = "34e39677d8527182346093002688d17a5d2fc204b9eb3e094b2e6ac519028228"
+python-versions = "^3.11"
+content-hash = "81b2fa642d7f2d1219cf80112ace12d689d053d81be7f7addb98144d56fc0fb2"
diff --git a/pyproject.toml b/pyproject.toml
index 7d6a001..7bfe271 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = ["Jeffrey C. Ollie <jeff@ocjtech.us>"]
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "^3.12"
+python = "^3.11"
 
 [tool.black]
 max-line-length = 120
@@ -22,7 +22,7 @@ force_sort_within_sections = true
 line-length = 120
 
 [tool.pyright]
-pythonVersion = "3.12"
+pythonVersion = "3.11"
 
 [build-system]
 requires = ["poetry-core"]