diff --git a/flake.lock b/flake.lock
index e3836a2..a27981e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -52,11 +52,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1712192574,
-        "narHash": "sha256-LbbVOliJKTF4Zl2b9salumvdMXuQBr2kuKP5+ZwbYq4=",
+        "lastModified": 1712420723,
+        "narHash": "sha256-VnG0Eu394Ga2FCe8Q66m6OEQF8iAqjDYsjmtl+N2omk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f480f9d09e4b4cf87ee6151eba068197125714de",
+        "rev": "9e7f26f82acb057498335362905fde6fea4ca50a",
         "type": "github"
       },
       "original": {
@@ -96,11 +96,11 @@
     "syncplay-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1709314949,
-        "narHash": "sha256-emGFzfJ1xmHiLvQ3gwp/Wt2QNqzaTslz5MCmxuk2hrE=",
+        "lastModified": 1712356708,
+        "narHash": "sha256-WKJHe2bhC2MgsiSZcyW0n1gxO6YdulFHoGf7dqX+AI0=",
         "owner": "odrling",
         "repo": "syncplay",
-        "rev": "41d0d952d1ed2b51994d3b9a64665540fdffb91d",
+        "rev": "c27fdce190829c14a3dcdbe17080e53bcedc9d88",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 52f23de..cff5df0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,16 +16,51 @@
     };
   };
 
-  outputs = inputs@{ flake-parts, dakara_check-src, ffmpegaacsucks-src, syncplay-src, ... }:
+  outputs =
+    { flake-parts
+    , dakara_check-src
+    , ffmpegaacsucks-src
+    , syncplay-src
+    , ...
+    }@inputs:
     flake-parts.lib.mkFlake { inherit inputs; } {
       systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
 
-      perSystem = { pkgs, ... }: {
+      perSystem = { self', pkgs, ... }: {
         packages = rec {
           dakara_check = pkgs.callPackage ./packages/dakara_check.nix { inherit dakara_check-src ffmpegaacsucks; };
           ffmpegaacsucks = pkgs.callPackage ./packages/ffmpegaacsucks.nix { inherit ffmpegaacsucks-src; };
           syncplay = pkgs.callPackage ./packages/syncplay.nix { inherit syncplay-src; };
         };
+
+        devShells = {
+          karaberus = pkgs.mkShell {
+            packages = with pkgs; [
+              go
+              go-tools
+              gopls
+              pkg-config
+              self'.packages.dakara_check
+            ];
+          };
+          nanachan = pkgs.mkShell {
+            packages = with pkgs; [
+              ffmpeg
+              libopus
+              poetry
+              python312
+              redis
+            ];
+          };
+          nanapi = pkgs.mkShell {
+            packages = with pkgs; [
+              edgedb
+              meilisearch
+              poetry
+              python312
+            ];
+          };
+        };
       };
     };
 }
diff --git a/packages/ffmpegaacsucks.nix b/packages/ffmpegaacsucks.nix
index 572c823..c27cb5f 100644
--- a/packages/ffmpegaacsucks.nix
+++ b/packages/ffmpegaacsucks.nix
@@ -1,6 +1,6 @@
 { stdenv
-, ffmpeg
 , ffmpegaacsucks-src
+, ffmpeg
 , meson
 , ninja
 , pkg-config
diff --git a/packages/syncplay.nix b/packages/syncplay.nix
index be3d850..1f866f0 100644
--- a/packages/syncplay.nix
+++ b/packages/syncplay.nix
@@ -1,5 +1,5 @@
-{ syncplay
-, syncplay-src
+{ syncplay-src
+, syncplay
 }:
 syncplay.overrideAttrs (oldAttrs: rec {
   name = "${pname}-${version}";