diff --git a/shell.nix b/shell.nix
index 4daa83a..7267c75 100644
--- a/shell.nix
+++ b/shell.nix
@@ -7,6 +7,7 @@ with import <nixpkgs> {};
       clang-tools_15
       gfortran12
       cmake
+      ninja
       gdb
       valgrind
       python39