diff --git a/dhall/flake.lock b/dhall/flake.lock
index d6b9406..280b29c 100644
--- a/dhall/flake.lock
+++ b/dhall/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/elixir/flake.lock b/elixir/flake.lock
index d6b9406..280b29c 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/gleam/flake.lock b/gleam/flake.lock
index d6b9406..280b29c 100644
--- a/gleam/flake.lock
+++ b/gleam/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/go1.17/flake.lock b/go1.17/flake.lock
index d6b9406..280b29c 100644
--- a/go1.17/flake.lock
+++ b/go1.17/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/go1.18/flake.lock b/go1.18/flake.lock
index d6b9406..280b29c 100644
--- a/go1.18/flake.lock
+++ b/go1.18/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/java/flake.lock b/java/flake.lock
index d6b9406..280b29c 100644
--- a/java/flake.lock
+++ b/java/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/java/flake.nix b/java/flake.nix
index fea142d..92c81e4 100644
--- a/java/flake.nix
+++ b/java/flake.nix
@@ -9,12 +9,17 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        jdk = "jdk17";
 
-        java = pkgs.jdk17;
+        config = {
+          packageOverrides = p: {
+            gradle = (p.gradle.override { java = p.${jdk}; });
+          };
+        };
 
+        pkgs = import nixpkgs { inherit config jdk system; };
+        java = pkgs.${jdk};
         buildTools = with pkgs; [ ant gradle maven ];
-
         inherit (pkgs) mkShell;
       in {
         devShells = {
diff --git a/kotlin/flake.lock b/kotlin/flake.lock
index d6b9406..280b29c 100644
--- a/kotlin/flake.lock
+++ b/kotlin/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/kotlin/flake.nix b/kotlin/flake.nix
index 6ed3c88..1490627 100644
--- a/kotlin/flake.nix
+++ b/kotlin/flake.nix
@@ -9,16 +9,26 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        jdk = "jdk17";
 
+        config = {
+          packageOverrides = p: {
+            gradle = (p.gradle.override { java = p.${jdk}; });
+
+            kotlin = (p.kotlin.override { jre = p.${jdk}; });
+          };
+        };
+
+        pkgs = import nixpkgs { inherit config system; };
         kotlin = pkgs.kotlin;
         buildTools = with pkgs; [ gradle ];
+        otherTools = with pkgs; [ gcc ncurses patchelf zlib ];
 
         inherit (pkgs) mkShell;
       in {
         devShells = {
           default = mkShell {
-            buildInputs = [ kotlin ] ++ buildTools;
+            buildInputs = [ kotlin ] ++ buildTools ++ otherTools;
 
             shellHook = ''
               ${kotlin}/bin/kotlin -version
diff --git a/nix/flake.lock b/nix/flake.lock
index d6b9406..280b29c 100644
--- a/nix/flake.lock
+++ b/nix/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/node/flake.lock b/node/flake.lock
index d6b9406..280b29c 100644
--- a/node/flake.lock
+++ b/node/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/rust/flake.lock b/rust/flake.lock
index df7d7c7..b9a5adf 100644
--- a/rust/flake.lock
+++ b/rust/flake.lock
@@ -32,11 +32,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/scala/flake.lock b/scala/flake.lock
index d6b9406..280b29c 100644
--- a/scala/flake.lock
+++ b/scala/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {
diff --git a/zig/flake.lock b/zig/flake.lock
index d6b9406..280b29c 100644
--- a/zig/flake.lock
+++ b/zig/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659049902,
-        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "lastModified": 1659050511,
+        "narHash": "sha256-JqDvJv3kiVMvwfA2NVbzmB/dx+LxJWhTXUCi5morzD4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "rev": "57b2048cc8c34f9a2e3a2edc196e9a98efc3862f",
         "type": "github"
       },
       "original": {