diff --git a/flake.lock b/flake.lock
index f18f046..dae1a6b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -35,16 +35,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1670064435,
-        "narHash": "sha256-+ELoY30UN+Pl3Yn7RWRPabykwebsVK/kYE9JsIsUMxQ=",
+        "lastModified": 1702759837,
+        "narHash": "sha256-u3XeJVRe/Q975nwFE+6ALEwypMKJEELMJKDAhSKyq3M=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "61a8a98e6d557e6dd7ed0cdb54c3a3e3bbc5e25c",
+        "rev": "b2566f4f897ac6224e094b167d9488d03e157f28",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "nixos-23.05",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 65ee671..7649e32 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,6 +37,7 @@
             xxd
             # FreeRTOS
             gcc-arm-embedded
+            openssl_legacy  # gdb needs libcrypt.so.1
             # generate bindings from RTOS to Rust
             rust-bindgen
             # compare libafl edges