diff --git a/shell.nix b/shell.nix
index 27f6be1..ceb2d7a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,4 +2,4 @@
 
 with pkgs;
 
-mkShell { buildInputs = [ python39 poetry ]; }
+mkShell { buildInputs = [ python38 poetry ]; }