diff --git a/clojure/flake.lock b/clojure/flake.lock
index 316c9af..d6fab38 100644
--- a/clojure/flake.lock
+++ b/clojure/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/clojure/flake.nix b/clojure/flake.nix
index e440944..f984a9e 100644
--- a/clojure/flake.nix
+++ b/clojure/flake.nix
@@ -32,7 +32,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ boot clojure leiningen ];
 
         shellHook = ''
diff --git a/cue/flake.lock b/cue/flake.lock
index 316c9af..d6fab38 100644
--- a/cue/flake.lock
+++ b/cue/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/cue/flake.nix b/cue/flake.nix
index ee28e0f..726ba64 100644
--- a/cue/flake.nix
+++ b/cue/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ cue ];
 
         shellHook = ''
diff --git a/dhall/flake.lock b/dhall/flake.lock
index 316c9af..d6fab38 100644
--- a/dhall/flake.lock
+++ b/dhall/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/dhall/flake.nix b/dhall/flake.nix
index c6d7813..e955504 100644
--- a/dhall/flake.nix
+++ b/dhall/flake.nix
@@ -33,7 +33,7 @@
       ] ++ pkgs.lib.optionals (pkgs.stdenv.isLinux) (mkDhallTools [ "csv" "text" ]); # Linux only
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = (with pkgs; [ dhall ]) ++ dhallTools;
 
         shellHook = ''
diff --git a/elixir/flake.lock b/elixir/flake.lock
index 316c9af..d6fab38 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/elixir/flake.nix b/elixir/flake.nix
index a6a2ece..49f3df7 100644
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = (with pkgs; [ elixir ]) ++
           pkgs.lib.optionals (pkgs.stdenv.isLinux) (with pkgs; [ gigalixir inotify-tools libnotify ]) ++ # Linux only
           pkgs.lib.optionals (pkgs.stdenv.isDarwin) (with pkgs; [ terminal-notifier ]) ++ # macOS only
diff --git a/elm/flake.lock b/elm/flake.lock
index 316c9af..d6fab38 100644
--- a/elm/flake.lock
+++ b/elm/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/elm/flake.nix b/elm/flake.nix
index a2cabbe..5e8b56a 100644
--- a/elm/flake.nix
+++ b/elm/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = (with pkgs.elmPackages; [ elm ]) ++ (with pkgs; [ elm2nix ]);
 
         shellHook = with pkgs.elmPackages; ''
diff --git a/gleam/flake.lock b/gleam/flake.lock
index 316c9af..d6fab38 100644
--- a/gleam/flake.lock
+++ b/gleam/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/gleam/flake.nix b/gleam/flake.nix
index 093ccdc..0f1f659 100644
--- a/gleam/flake.nix
+++ b/gleam/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ gleam ];
 
         shellHook = ''
diff --git a/go/flake.lock b/go/flake.lock
index 316c9af..d6fab38 100644
--- a/go/flake.lock
+++ b/go/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/go/flake.nix b/go/flake.nix
index ac43480..ab4d6c2 100644
--- a/go/flake.nix
+++ b/go/flake.nix
@@ -19,9 +19,9 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShellNoCC {
+      devShells.default = pkgs.mkShellNoCC {
         buildInputs = with pkgs; [
-          # go 1.17.1 (specified by overlay)
+          # go 1.19 (specified by overlay)
           go
 
           # goimports, godoc, etc.
diff --git a/hashi/flake.lock b/hashi/flake.lock
index 316c9af..d6fab38 100644
--- a/hashi/flake.lock
+++ b/hashi/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/hashi/flake.nix b/hashi/flake.nix
index 5da6b95..5040526 100644
--- a/hashi/flake.nix
+++ b/hashi/flake.nix
@@ -18,7 +18,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [
           packer
           terraform
diff --git a/haskell/flake.lock b/haskell/flake.lock
index 316c9af..d6fab38 100644
--- a/haskell/flake.lock
+++ b/haskell/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/haskell/flake.nix b/haskell/flake.nix
index 505b5c6..63ce1d2 100644
--- a/haskell/flake.nix
+++ b/haskell/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ cabal-install ghc ];
 
         shellHook = with pkgs; ''
diff --git a/java/flake.lock b/java/flake.lock
index 316c9af..d6fab38 100644
--- a/java/flake.lock
+++ b/java/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/java/flake.nix b/java/flake.nix
index bb4fba5..1ad6a15 100644
--- a/java/flake.nix
+++ b/java/flake.nix
@@ -31,7 +31,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ gradle jdk maven ];
 
         shellHook = ''
diff --git a/kotlin/flake.lock b/kotlin/flake.lock
index 316c9af..d6fab38 100644
--- a/kotlin/flake.lock
+++ b/kotlin/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/kotlin/flake.nix b/kotlin/flake.nix
index 488a2ee..7daba80 100644
--- a/kotlin/flake.nix
+++ b/kotlin/flake.nix
@@ -31,7 +31,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ kotlin gradle gcc ncurses patchelf zlib ];
 
         shellHook = ''
diff --git a/nickel/flake.lock b/nickel/flake.lock
index 316c9af..d6fab38 100644
--- a/nickel/flake.lock
+++ b/nickel/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/nickel/flake.nix b/nickel/flake.nix
index d7157ff..422f2a8 100644
--- a/nickel/flake.nix
+++ b/nickel/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ nickel ];
 
         shellHook = ''
diff --git a/nix/.envrc b/nix/.envrc
index 03f8b73..a5dbbcb 100644
--- a/nix/.envrc
+++ b/nix/.envrc
@@ -1,2 +1 @@
 use flake .
-use flake .
diff --git a/nix/flake.lock b/nix/flake.lock
index 316c9af..d6fab38 100644
--- a/nix/flake.lock
+++ b/nix/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/nix/flake.nix b/nix/flake.nix
index 6c931e9..afda172 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [
           cachix
           lorri
diff --git a/node/flake.lock b/node/flake.lock
index 316c9af..d6fab38 100644
--- a/node/flake.lock
+++ b/node/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/node/flake.nix b/node/flake.nix
index 7fba182..8c92567 100644
--- a/node/flake.nix
+++ b/node/flake.nix
@@ -24,7 +24,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ node2nix nodejs pnpm yarn ];
 
         shellHook = ''
diff --git a/ocaml/flake.lock b/ocaml/flake.lock
index 316c9af..d6fab38 100644
--- a/ocaml/flake.lock
+++ b/ocaml/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/ocaml/flake.nix b/ocaml/flake.nix
index 800e6d9..f9cacb0 100644
--- a/ocaml/flake.nix
+++ b/ocaml/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ ocaml ocamlformat ] ++
           (with pkgs.ocamlPackages; [ dune_3 odoc ]);
 
diff --git a/opa/flake.lock b/opa/flake.lock
index 316c9af..d6fab38 100644
--- a/opa/flake.lock
+++ b/opa/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/opa/flake.nix b/opa/flake.nix
index 4d6599b..ca4af7b 100644
--- a/opa/flake.nix
+++ b/opa/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ open-policy-agent conftest ];
 
         shellHook = ''
diff --git a/protobuf/flake.lock b/protobuf/flake.lock
index 316c9af..d6fab38 100644
--- a/protobuf/flake.lock
+++ b/protobuf/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/protobuf/flake.nix b/protobuf/flake.nix
index b4bb3bf..24cf3b4 100644
--- a/protobuf/flake.nix
+++ b/protobuf/flake.nix
@@ -16,7 +16,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ buf protobuf ];
 
         shellHook = with pkgs; ''
diff --git a/python/flake.lock b/python/flake.lock
index c2bbc48..37375c6 100644
--- a/python/flake.lock
+++ b/python/flake.lock
@@ -37,11 +37,11 @@
         "pypi-deps-db": "pypi-deps-db"
       },
       "locked": {
-        "lastModified": 1660767432,
-        "narHash": "sha256-aFZSd2aAO10IaVLCaff+oXsibm+m2BDlrxapEesW14E=",
+        "lastModified": 1662635943,
+        "narHash": "sha256-1OBBlBzZ894or8eHZjyADOMnGH89pPUKYGVVS5rwW/0=",
         "owner": "DavHau",
         "repo": "mach-nix",
-        "rev": "b5614640bc3379408d90db9e375b47345fbc21eb",
+        "rev": "65266b5cc867fec2cb6a25409dd7cd12251f6107",
         "type": "github"
       },
       "original": {
@@ -67,11 +67,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
@@ -83,11 +83,11 @@
     "pypi-deps-db": {
       "flake": false,
       "locked": {
-        "lastModified": 1643877077,
-        "narHash": "sha256-jv8pIvRFTP919GybOxXE5TfOkrjTbdo9QiCO1TD3ZaY=",
+        "lastModified": 1661155889,
+        "narHash": "sha256-t00mBTZhmZBT4jteO6pJbU0wyRS6/ep4pKmQNeztEms=",
         "owner": "DavHau",
         "repo": "pypi-deps-db",
-        "rev": "da53397f0b782b0b18deb72ef8e0fb5aa7c98aa3",
+        "rev": "49c620f3de2b557c9d5c44f58a00fee59f27d1b0",
         "type": "github"
       },
       "original": {
diff --git a/python/flake.nix b/python/flake.nix
index 8cd5c1a..4027d74 100644
--- a/python/flake.nix
+++ b/python/flake.nix
@@ -25,7 +25,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ python machNix virtualenv ] ++
           (with pkgs.python311Packages; [ pip ]);
 
diff --git a/ruby/flake.lock b/ruby/flake.lock
index 316c9af..d6fab38 100644
--- a/ruby/flake.lock
+++ b/ruby/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/ruby/flake.nix b/ruby/flake.nix
index 91d97aa..5eb2131 100644
--- a/ruby/flake.nix
+++ b/ruby/flake.nix
@@ -21,7 +21,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ ruby ];
 
         shellHook = ''
diff --git a/rust/flake.lock b/rust/flake.lock
index 7317610..85f0a71 100644
--- a/rust/flake.lock
+++ b/rust/flake.lock
@@ -17,11 +17,11 @@
     },
     "flake-utils_2": {
       "locked": {
-        "lastModified": 1656928814,
-        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
         "type": "github"
       },
       "original": {
@@ -32,11 +32,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
@@ -47,11 +47,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1659102345,
-        "narHash": "sha256-Vbzlz254EMZvn28BhpN8JOi5EuKqnHZ3ujFYgFcSGvk=",
+        "lastModified": 1665296151,
+        "narHash": "sha256-uOB0oxqxN9K7XGF1hcnY+PQnlQJ+3bP2vCn/+Ru/bbc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "11b60e4f80d87794a2a4a8a256391b37c59a1ea7",
+        "rev": "14ccaaedd95a488dd7ae142757884d8e125b3363",
         "type": "github"
       },
       "original": {
@@ -74,11 +74,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1661136859,
-        "narHash": "sha256-o3y1elFGRs/9kqaIeziAnTy9lIWA6VHtQfq0ARRVO2A=",
+        "lastModified": 1665543630,
+        "narHash": "sha256-tt3EmBcNCER8G9mCmYmPel/KwMlkIP56un33ArE65eo=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "6d1418192be90968acfa25e7d7b089e246eb15c4",
+        "rev": "8c727f07aa0ce5b618a3c653da75ace830485b21",
         "type": "github"
       },
       "original": {
diff --git a/rust/flake.nix b/rust/flake.nix
index ada4164..4a2362d 100644
--- a/rust/flake.nix
+++ b/rust/flake.nix
@@ -35,7 +35,7 @@
       pkgs = import nixpkgs { inherit system overlays; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         nativeBuildInputs = with pkgs; [
           rustToolchain
           openssl
diff --git a/scala/flake.lock b/scala/flake.lock
index 316c9af..d6fab38 100644
--- a/scala/flake.lock
+++ b/scala/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/scala/flake.nix b/scala/flake.nix
index 76b8129..913ac41 100644
--- a/scala/flake.nix
+++ b/scala/flake.nix
@@ -31,7 +31,7 @@
       pkgs = import nixpkgs { inherit overlays system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ scala sbt coursier ];
 
         shellHook = ''
diff --git a/zig/flake.lock b/zig/flake.lock
index 316c9af..d6fab38 100644
--- a/zig/flake.lock
+++ b/zig/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1661178095,
-        "narHash": "sha256-VP8KoVbqHT7dihr8XES0fM1SmuOxQGyRP85MMDTSEf0=",
+        "lastModified": 1665607107,
+        "narHash": "sha256-ALYav/rDpqZKxP4szZw6qgCd6sol1zZKHtVwylrKxTQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d2a38cb03b8f5badfb70bfc2acb3151ed9609e38",
+        "rev": "c119e44bcce824647eff0229449374b1f0c9ad0e",
         "type": "github"
       },
       "original": {
diff --git a/zig/flake.nix b/zig/flake.nix
index 7ab0ba9..99af3fa 100644
--- a/zig/flake.nix
+++ b/zig/flake.nix
@@ -17,7 +17,7 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      devShell = pkgs.mkShell {
+      devShells.default = pkgs.mkShell {
         buildInputs = with pkgs; [ zig ];
 
         shellHook = ''