diff --git a/.gitignore b/.gitignore
index 0380f68a..2c523f1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,13 @@
 # Development worktrees
 .worktrees/
 
+# Nix development environment state
+.nix-mix/
+.nix-hex/
+.nix-postgres/
+.nix-redis/
+.nix-services-started
+
 # The directory Mix will write compiled artifacts to.
 /_build/