diff --git a/.github/workflows/compile.yml b/.github/workflows/compile.yml
index 525fa81..367fdd2 100644
--- a/.github/workflows/compile.yml
+++ b/.github/workflows/compile.yml
@@ -13,11 +13,10 @@ jobs:
   compile:
     strategy:
       matrix:
-        zig_version: [0.11.0, master]
-        os: [ubuntu-latest]
+        zig_version: [0.11.0, 0.12.0]
         experimental: [false]
         include:
-          - zig_version: 0.11.0
+          - zig_version: 0.12.0
             os: windows-latest
             experimental: true
           - zig_version: master
@@ -26,7 +25,7 @@ jobs:
 
     continue-on-error: ${{ matrix.experimental }}
 
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
 
     steps:
       - name: Set up Zig
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5d219a0..468708f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Set up Zig
         uses: goto-bus-stop/setup-zig@v2.1.0
         with:
-          version: 0.11.0
+          version: 0.12.0
 
       - name: Check out repository
         uses: actions/checkout@v3
diff --git a/.tool-versions b/.tool-versions
index 932b1fe..939bae7 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-zig 0.11
+zig 0.12
diff --git a/aqua.yaml b/aqua.yaml
index f461eb2..0df10df 100644
--- a/aqua.yaml
+++ b/aqua.yaml
@@ -10,4 +10,4 @@ registries:
 - type: standard
   ref: v4.63.0 # renovate: depName=aquaproj/aqua-registry
 packages:
-- name: ziglang/zig@0.11.0
+- name: ziglang/zig@0.12.0
diff --git a/build.zig b/build.zig
index ab66da8..147a422 100644
--- a/build.zig
+++ b/build.zig
@@ -1,10 +1,10 @@
 const std = @import("std");
-const LazyPath = if (@hasDecl(std.Build, "LazyPath")) std.Build.LazyPath else std.Build.FileSource;
+const Build = if (@hasDecl(std, "Build")) std.Build else std.build.Builder;
 
-pub fn build(b: *std.Build) !void {
+pub fn build(b: *Build) !void {
     const target = b.standardTargetOptions(.{});
-    const optimize = b.standardOptimizeOption(.{});
-    const root_source_file = LazyPath.relative("src/main.zig");
+    const optimize = if (comptime @hasDecl(Build, "standardOptimizeOption")) b.standardOptimizeOption(.{}) else b.standardReleaseOptions();
+    const root_source_file = if (@hasDecl(Build, "path")) b.path("src/main.zig") else Build.LazyPath.relative("src/main.zig");
 
     // Dt executable
     const dt_step = b.step("dt", "Install dt executable");
@@ -16,7 +16,9 @@ pub fn build(b: *std.Build) !void {
         .target = target,
     });
 
-    const dt_install = b.addInstallArtifact(dt, .{});
+    const dt_install =
+        b.addInstallArtifact(dt, .{});
+
     dt_step.dependOn(&dt_install.step);
     b.default_step.dependOn(dt_step);
 
@@ -28,7 +30,7 @@ pub fn build(b: *std.Build) !void {
 
         const query = try std.zig.CrossTarget.parse(.{ .arch_os_abi = TRIPLE });
 
-        const cross: *std.Build.Step.Compile = b.addExecutable(.{
+        const cross = b.addExecutable(.{
             .name = exe,
             .root_source_file = root_source_file,
             .optimize = optimize,
@@ -40,9 +42,11 @@ pub fn build(b: *std.Build) !void {
                 query,
         });
 
-        const cross_install = b.addInstallArtifact(cross, .{});
+        const cross_install =
+            b.addInstallArtifact(cross, .{});
 
-        const exe_filename = if (query.cpu_arch == .wasm32) exe ++ ".wasm" else if (query.os_tag == .windows) exe ++ ".exe" else exe;
+        const is_wasm = if (query.cpu_arch) |arch| arch.isWasm() else false;
+        const exe_filename = if (is_wasm) exe ++ ".wasm" else if (query.os_tag == .windows) exe ++ ".exe" else exe;
 
         const cross_tar = b.addSystemCommand(&.{
             "tar", "--transform", "s|" ++ exe ++ "|dt|", "-czvf", exe ++ ".tgz", exe_filename,
@@ -52,7 +56,7 @@ pub fn build(b: *std.Build) !void {
             // Zig 0.12.0
             cross_tar.setCwd(.{ .path = "./zig-out/bin/" });
         } else {
-            // Zig 0.11.0
+            // Zig 0.11
             cross_tar.cwd = "./zig-out/bin/";
         }
 
@@ -63,7 +67,8 @@ pub fn build(b: *std.Build) !void {
     // Tests
     const test_step = b.step("test", "Run tests");
 
-    const test_exe = b.addTest(.{
+    const test_exe =
+        b.addTest(.{
         .root_source_file = root_source_file,
         .optimize = optimize,
         .target = target,
diff --git a/build.zig.zon b/build.zig.zon
index e3b4883..2cfa90f 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -1,5 +1,5 @@
 .{
     .name = "dt",
-    .version = "1.3.1", // Update in main.zig as well
-    .paths = .{ "" },
+    .version = "2.0.0-rc", // Update in main.zig as well
+    .paths = .{""},
 }
diff --git a/default.nix b/default.nix
index fe7eff0..baeab5e 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,7 @@
 { lib
 , stdenv
 , testers
-, zig_0_11
+, zig_0_12
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -10,7 +10,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   src = lib.cleanSource ./.;
 
-  nativeBuildInputs = [ zig_0_11.hook ];
+  nativeBuildInputs = [ zig_0_12.hook ];
 
   passthru.tests.version = testers.testVersion { package = finalAttrs.finalPackage; };
 
diff --git a/dev/dt b/dev/dt
index 97d3747..99e716c 100755
--- a/dev/dt
+++ b/dev/dt
@@ -10,7 +10,7 @@ if [[ $DT_ROOT != dev/.. ]]; then
   >&2 echo "ERROR: $0 is intended to be run when developing dt."
   >&2 echo "If you're just trying to run a dt built from source:"
   >&2 echo "- Navigate to $DT_ROOT"
-  >&2 echo "- Run './build release' to compile a release executable (Requires Zig 0.11.*)"
+  >&2 echo "- Run './build release' to compile a release executable (Expects Zig 0.12)"
   >&2 echo "- Use the result at: $DT"
   exit 1
 fi
diff --git a/flake.nix b/flake.nix
index 47cd24b..2df1f09 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,7 +16,7 @@
     in {
       packages.default = dt;
       devShells.default = pkgs.mkShell {
-        packages = with pkgs; [ zig_0_11 ];
+        packages = with pkgs; [ zig_0_12 ];
       };
     });
 }
diff --git a/src/builtins.zig b/src/builtins.zig
index 1e20880..a665b0b 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -1,5 +1,7 @@
 const std = @import("std");
 const ArrayList = std.ArrayList;
+const osExit = if (@hasDecl(std, "posix")) std.posix.exit else std.os.exit;
+const osChdir = if (@hasDecl(std, "posix")) std.posix.chdir else std.os.chdir;
 
 const interpret = @import("interpret.zig");
 const Command = interpret.Command;
@@ -139,7 +141,7 @@ pub fn quit(dt: *DtMachine) !void {
         try dt.norm();
     }
 
-    std.os.exit(0);
+    osExit(0);
 }
 
 test "drop quit" {
@@ -172,7 +174,7 @@ pub fn exit(dt: *DtMachine) !void {
     }
 
     const code: u8 = @intCast(i);
-    std.os.exit(code);
+    osExit(code);
 }
 
 test "7 exit" {
@@ -225,7 +227,7 @@ pub fn cd(dt: *DtMachine) !void {
         path = try std.process.getEnvVarOwned(dt.alloc, "HOME");
     }
 
-    std.os.chdir(path) catch |e| return dt.rewind(log, val, e);
+    osChdir(path) catch |e| return dt.rewind(log, val, e);
 }
 
 test "\".\" cd" {
diff --git a/src/main.zig b/src/main.zig
index f781994..9d80773 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const Allocator = std.mem.Allocator;
+const osExit = if (@hasDecl(std, "posix")) std.posix.exit else std.os.exit;
 
 const builtins = @import("builtins.zig");
 
@@ -7,7 +8,7 @@ const interpret = @import("interpret.zig");
 const DtMachine = interpret.DtMachine;
 
 // TODO: Change to @import when it's supported for zon
-pub const version = "1.3.1"; // Update in build.zig.zon as well.
+pub const version = "2.0.0-rc"; // Update in build.zig.zon as well.
 
 const stdlib = @embedFile("stdlib.dt");
 const dtlib = @embedFile("dt.dt");
@@ -35,17 +36,15 @@ pub fn main() !void {
         if (try readShebangFile(arena.allocator(), firstArg)) |fileContents| {
             return dt.loadFile(fileContents) catch |e| return doneOrDie(&dt, e);
         } else if ((std.mem.eql(u8, firstArg, "--stream") or std.mem.startsWith(u8, firstArg, "--stream ")) and (stdinPiped or stdoutPiped)) {
-            return handlePipedStdoutOnly(&dt);
+            dt.handleCmd("dt/run-args") catch |e| return doneOrDie(&dt, e);
         }
     }
 
     if (stdinPiped) {
-        return handlePipedStdin(&dt);
-    } else if (stdoutPiped) {
-        return handlePipedStdoutOnly(&dt);
+        dt.handleCmd("dt/pipe-thru-args") catch |e| return doneOrDie(&dt, e);
+    } else {
+        dt.handleCmd("dt/run-args") catch |e| return doneOrDie(&dt, e);
     }
-
-    return readEvalPrintLoop(&dt);
 }
 
 fn readFirstArg(allocator: Allocator) !?[]const u8 {
@@ -54,29 +53,6 @@ fn readFirstArg(allocator: Allocator) !?[]const u8 {
     return if (args.next()) |arg| try allocator.dupe(u8, arg) else null;
 }
 
-fn handlePipedStdin(dt: *DtMachine) !void {
-    dt.handleCmd("dt/pipe-thru-args") catch |e| return doneOrDie(dt, e);
-}
-
-fn handlePipedStdoutOnly(dt: *DtMachine) !void {
-    dt.handleCmd("dt/run-args") catch |e| return doneOrDie(dt, e);
-}
-
-fn readEvalPrintLoop(dt: *DtMachine) !void {
-    dt.handleCmd("dt/run-args") catch |e| return doneOrDie(dt, e);
-
-    // TODO: Can this catch be done in the stdlib? Other people need to catch errors too!
-    while (true) dt.handleCmd("dt/main-repl") catch |e| switch (e) {
-        error.EndOfStream => return,
-        else => {
-            const stderr = std.io.getStdErr().writer();
-            try dt.red();
-            try stderr.print("\nRestarting REPL after error: {s}\n\n", .{@errorName(e)});
-            try dt.norm();
-        },
-    };
-}
-
 fn doneOrDie(dt: *DtMachine, reason: anyerror) !void {
     const stderr = std.io.getStdErr().writer();
     try stderr.print("\n", .{});
@@ -88,7 +64,7 @@ fn doneOrDie(dt: *DtMachine, reason: anyerror) !void {
             try stderr.print("\nRIP: {any}\n", .{reason});
             try dt.norm();
 
-            std.os.exit(1);
+            osExit(1);
         },
     }
 }