diff --git a/build.zig b/build.zig
index 9c7c12aed..730a09793 100644
--- a/build.zig
+++ b/build.zig
@@ -19,7 +19,7 @@ const Version = @import("src/build/Version.zig");
 // but we liberally update it. In the future, we'll be more careful about
 // using released versions so that package managers can integrate better.
 comptime {
-    const required_zig = "0.12.0-dev.983+78f2ae7f2";
+    const required_zig = "0.12.0-dev.1754+2a3226453";
     const current_zig = builtin.zig_version;
     const min_zig = std.SemanticVersion.parse(required_zig) catch unreachable;
     if (current_zig.order(min_zig) == .lt) {
@@ -875,7 +875,7 @@ fn benchSteps(
 ) !void {
     // Open the directory ./src/bench
     const c_dir_path = (comptime root()) ++ "/src/bench";
-    var c_dir = try fs.openIterableDirAbsolute(c_dir_path, .{});
+    var c_dir = try fs.openDirAbsolute(c_dir_path, .{ .iterate = true });
     defer c_dir.close();
 
     // Go through and add each as a step
@@ -918,7 +918,7 @@ fn conformanceSteps(
 
     // Open the directory ./conformance
     const c_dir_path = (comptime root()) ++ "/conformance";
-    var c_dir = try fs.openIterableDirAbsolute(c_dir_path, .{});
+    var c_dir = try fs.openDirAbsolute(c_dir_path, .{ .iterate = true });
     defer c_dir.close();
 
     // Go through and add each as a step
diff --git a/build.zig.zon b/build.zig.zon
index fc1ecb2f9..a1f3c1497 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -5,12 +5,12 @@
     .dependencies = .{
         // Zig libs
         .libxev = .{
-            .url = "https://github.com/mitchellh/libxev/archive/a5f8b9851c18d93a79a154004fb0393a1ec55c65.tar.gz",
-            .hash = "1220589dfd60060857bfcee53b0ee0e4175f764ae22d54e46054e2f81b63af1f6636",
+            .url = "https://github.com/mitchellh/libxev/archive/7eada4333c36b3e16f4dc2abad707149ef7b6de5.tar.gz",
+            .hash = "1220be2c7b3f3a07b9150720140c7038f454a9ce0cbc5d303767c1e4a50856ec1b01",
         },
         .mach_glfw = .{
-            .url = "https://github.com/hexops/mach-glfw/archive/16dc95cc7f74ebbbdd848d9a2c3cc4afc5717708.tar.gz",
-            .hash = "12202da6b8e9024c653f5d67f55a8065b401c42b3c08b69333d95400fe85d6019a59",
+            .url = "https://github.com/hexops/mach-glfw/archive/577220552e1b31c4496d2e0df2fb5fbc9287b966.tar.gz",
+            .hash = "12204779ba2f14b46f569110f774d5c3f48b7a105b6717e668bc410710bceae62072",
         },
         .zig_objc = .{
             .url = "https://github.com/mitchellh/zig-objc/archive/10e552bd37c2f61b9f570d5ceb145165c6f1854b.tar.gz",
diff --git a/flake.lock b/flake.lock
index 4064aea36..44bbec12e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -257,11 +257,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1700439807,
-        "narHash": "sha256-8JOqjnlOsJWryzfZ61Zz0hfCW2m6mu8JnW0Sb/EWB3I=",
+        "lastModified": 1701259715,
+        "narHash": "sha256-k323e7C01XaVyvzprw6Lay51V1quKzkPOsrbEtkV390=",
         "owner": "mitchellh",
         "repo": "zig-overlay",
-        "rev": "0a3f3e96cbb0df6c70dd6c957c0fde90d8d57a78",
+        "rev": "3b7938f44a345b12f70f0e34d5492b75e4005767",
         "type": "github"
       },
       "original": {
diff --git a/nix/zig_cache_hash.nix b/nix/zig_cache_hash.nix
index 3163c1ac9..781f50358 100644
--- a/nix/zig_cache_hash.nix
+++ b/nix/zig_cache_hash.nix
@@ -1,3 +1,3 @@
 # This file is auto-generated! check build-support/check-zig-cache-hash.sh for
 # more details.
-"sha256-bQ81e0vJBSLkVJ3a3nLraVc/JeG77xGckuARmu81DqI="
+"sha256-Dn9KRvSteFvHWy6ULEQbRIQZf+bVfpVYWsImGm32qeI="
diff --git a/pkg/fontconfig/common.zig b/pkg/fontconfig/common.zig
index 3f3b22388..5562815db 100644
--- a/pkg/fontconfig/common.zig
+++ b/pkg/fontconfig/common.zig
@@ -89,7 +89,7 @@ pub const Property = enum {
 
                     // Build our string
                     var name: [replaced.len:0]u8 = undefined;
-                    std.mem.copy(u8, &name, replaced);
+                    @memcpy(&name, replaced);
                     name[replaced.len] = 0;
                     break :name &name;
                 };
diff --git a/src/Command.zig b/src/Command.zig
index afca6a564..b02a9bc78 100644
--- a/src/Command.zig
+++ b/src/Command.zig
@@ -374,9 +374,9 @@ pub fn expandPath(alloc: Allocator, cmd: []const u8) !?[]u8 {
         if (path_buf.len < path_len) return error.PathTooLong;
 
         // Copy in the full path
-        mem.copy(u8, &path_buf, search_path);
+        @memcpy(path_buf[0..search_path.len], search_path);
         path_buf[search_path.len] = std.fs.path.sep;
-        mem.copy(u8, path_buf[search_path.len + 1 ..], cmd);
+        @memcpy(path_buf[search_path.len + 1 ..][0..cmd.len], cmd);
         path_buf[path_len] = 0;
         const full_path = path_buf[0..path_len :0];
 
@@ -440,9 +440,9 @@ fn createNullDelimitedEnvMap(arena: mem.Allocator, env_map: *const EnvMap) ![:nu
     var i: usize = 0;
     while (it.next()) |pair| : (i += 1) {
         const env_buf = try arena.allocSentinel(u8, pair.key_ptr.len + pair.value_ptr.len + 1, 0);
-        mem.copy(u8, env_buf, pair.key_ptr.*);
+        @memcpy(env_buf[0..pair.key_ptr.len], pair.key_ptr.*);
         env_buf[pair.key_ptr.len] = '=';
-        mem.copy(u8, env_buf[pair.key_ptr.len + 1 ..], pair.value_ptr.*);
+        @memcpy(env_buf[pair.key_ptr.len + 1 ..], pair.value_ptr.*);
         envp_buf[i] = env_buf.ptr;
     }
     std.debug.assert(i == envp_count);
diff --git a/src/Surface.zig b/src/Surface.zig
index e4984ccbd..1ab1cf2e8 100644
--- a/src/Surface.zig
+++ b/src/Surface.zig
@@ -2501,7 +2501,7 @@ pub fn performBindingAction(self: *Surface, action: input.Binding.Action) !bool
         .text => |data| {
             // For text we always allocate just because its easier to
             // handle all cases that way.
-            var buf = try self.alloc.alloc(u8, data.len);
+            const buf = try self.alloc.alloc(u8, data.len);
             defer self.alloc.free(buf);
             const text = configpkg.string.parse(buf, data) catch |err| {
                 log.warn(
diff --git a/src/cli/args.zig b/src/cli/args.zig
index d8b670852..99e6f7aa1 100644
--- a/src/cli/args.zig
+++ b/src/cli/args.zig
@@ -204,14 +204,14 @@ fn parseIntoField(
                 []const u8 => value: {
                     const slice = value orelse return error.ValueRequired;
                     const buf = try alloc.alloc(u8, slice.len);
-                    mem.copy(u8, buf, slice);
+                    @memcpy(buf, slice);
                     break :value buf;
                 },
 
                 [:0]const u8 => value: {
                     const slice = value orelse return error.ValueRequired;
                     const buf = try alloc.allocSentinel(u8, slice.len, 0);
-                    mem.copy(u8, buf, slice);
+                    @memcpy(buf, slice);
                     buf[slice.len] = 0;
                     break :value buf;
                 },
@@ -709,7 +709,7 @@ pub fn LineIterator(comptime ReaderType: type) type {
                     // Trim any whitespace around it
                     const trim = std.mem.trim(u8, entry, whitespace);
                     if (trim.len != entry.len) {
-                        std.mem.copy(u8, entry, trim);
+                        std.mem.copyForwards(u8, entry, trim);
                         entry = entry[0..trim.len];
                     }
 
@@ -737,9 +737,9 @@ pub fn LineIterator(comptime ReaderType: type) type {
 
                         const len = key.len + value.len + 1;
                         if (entry.len != len) {
-                            std.mem.copy(u8, entry, key);
+                            std.mem.copyForwards(u8, entry, key);
                             entry[key.len] = '=';
-                            std.mem.copy(u8, entry[key.len + 1 ..], value);
+                            std.mem.copyForwards(u8, entry[key.len + 1 ..], value);
                             entry = entry[0..len];
                         }
                     }
diff --git a/src/cli/list_themes.zig b/src/cli/list_themes.zig
index bf763c5bf..37e515a42 100644
--- a/src/cli/list_themes.zig
+++ b/src/cli/list_themes.zig
@@ -43,7 +43,7 @@ pub fn run(alloc: Allocator) !u8 {
     const path = try std.fs.path.join(alloc, &.{ resources_dir, "themes" });
     defer alloc.free(path);
 
-    var dir = try std.fs.cwd().openIterableDir(path, .{});
+    var dir = try std.fs.cwd().openDir(path, .{ .iterate = true });
     defer dir.close();
 
     var walker = try dir.walk(alloc);
diff --git a/src/config/Config.zig b/src/config/Config.zig
index f49d21d82..a54ace398 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -2246,7 +2246,7 @@ pub const Keybinds = struct {
             const buf = try alloc.alloc(u8, value.len);
             copy = buf;
 
-            std.mem.copy(u8, buf, value);
+            @memcpy(buf, value);
             break :value buf;
         };
         errdefer if (copy) |v| alloc.free(v);
diff --git a/src/fastmem.zig b/src/fastmem.zig
index b15b0e7aa..0e9a444ee 100644
--- a/src/fastmem.zig
+++ b/src/fastmem.zig
@@ -2,23 +2,23 @@ const std = @import("std");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
 
-/// Same as std.mem.copy but prefers libc memmove if it is available
+/// Same as std.mem.copyForwards but prefers libc memmove if it is available
 /// because it is generally much faster.
 pub inline fn move(comptime T: type, dest: []T, source: []const T) void {
     if (builtin.link_libc) {
         _ = memmove(dest.ptr, source.ptr, source.len * @sizeOf(T));
     } else {
-        std.mem.copy(T, dest, source);
+        std.mem.copyForwards(T, dest, source);
     }
 }
 
-/// Same as std.mem.copy but prefers libc memcpy if it is available
+/// Same as std.mem.copyForwards but prefers libc memcpy if it is available
 /// because it is generally much faster.
 pub inline fn copy(comptime T: type, dest: []T, source: []const T) void {
     if (builtin.link_libc) {
         _ = memcpy(dest.ptr, source.ptr, source.len * @sizeOf(T));
     } else {
-        std.mem.copy(T, dest, source);
+        @memcpy(dest[0..source.len], source);
     }
 }
 
diff --git a/src/font/sprite/canvas.zig b/src/font/sprite/canvas.zig
index a13e1e50b..83d924008 100644
--- a/src/font/sprite/canvas.zig
+++ b/src/font/sprite/canvas.zig
@@ -390,7 +390,7 @@ const PixmanImpl = struct {
                 var src_ptr = data.ptr;
                 var i: usize = 0;
                 while (i < height) : (i += 1) {
-                    std.mem.copy(u8, dst_ptr, src_ptr[0 .. width * depth]);
+                    @memcpy(dst_ptr[0 .. width * depth], src_ptr[0 .. width * depth]);
                     dst_ptr = dst_ptr[width * depth ..];
                     src_ptr += @as(usize, @intCast(stride));
                 }
diff --git a/src/os/homedir.zig b/src/os/homedir.zig
index 809afea30..ab60cdf26 100644
--- a/src/os/homedir.zig
+++ b/src/os/homedir.zig
@@ -22,7 +22,7 @@ fn homeUnix(buf: []u8) !?[]u8 {
     // First: if we have a HOME env var, then we use that.
     if (std.os.getenv("HOME")) |result| {
         if (buf.len < result.len) return Error.BufferTooSmall;
-        std.mem.copy(u8, buf, result);
+        @memcpy(buf[0..result.len], result);
         return buf[0..result.len];
     }
 
@@ -46,7 +46,7 @@ fn homeUnix(buf: []u8) !?[]u8 {
         if (run.term == .Exited and run.term.Exited == 0) {
             const result = trimSpace(run.stdout);
             if (buf.len < result.len) return Error.BufferTooSmall;
-            std.mem.copy(u8, buf, result);
+            @memcpy(buf[0..result.len], result);
             return buf[0..result.len];
         }
     }
@@ -56,7 +56,7 @@ fn homeUnix(buf: []u8) !?[]u8 {
     const pw = try passwd.get(fba.allocator());
     if (pw.home) |result| {
         if (buf.len < result.len) return Error.BufferTooSmall;
-        std.mem.copy(u8, buf, result);
+        @memcpy(buf[0..result.len], result);
         return buf[0..result.len];
     }
 
@@ -71,7 +71,7 @@ fn homeUnix(buf: []u8) !?[]u8 {
     if (run.term == .Exited and run.term.Exited == 0) {
         const result = trimSpace(run.stdout);
         if (buf.len < result.len) return Error.BufferTooSmall;
-        std.mem.copy(u8, buf, result);
+        @memcpy(buf[0..result.len], result);
         return buf[0..result.len];
     }
 
diff --git a/src/os/passwd.zig b/src/os/passwd.zig
index a9bfb0e8a..8aaf5ed42 100644
--- a/src/os/passwd.zig
+++ b/src/os/passwd.zig
@@ -123,14 +123,14 @@ pub fn get(alloc: Allocator) !Entry {
     if (pw.pw_shell) |ptr| {
         const source = std.mem.sliceTo(ptr, 0);
         const sh = try alloc.alloc(u8, source.len);
-        std.mem.copy(u8, sh, source);
+        @memcpy(sh, source);
         result.shell = sh;
     }
 
     if (pw.pw_dir) |ptr| {
         const source = std.mem.sliceTo(ptr, 0);
         const dir = try alloc.alloc(u8, source.len);
-        std.mem.copy(u8, dir, source);
+        @memcpy(dir, source);
         result.home = dir;
     }
 
diff --git a/src/pty.zig b/src/pty.zig
index a482dc42b..f31d5f97d 100644
--- a/src/pty.zig
+++ b/src/pty.zig
@@ -132,7 +132,7 @@ const WindowsPty = struct {
     pub const Fd = windows.HANDLE;
 
     // Process-wide counter for pipe names
-    var pipe_name_counter = std.atomic.Atomic(u32).init(1);
+    var pipe_name_counter = std.atomic.Value(u32).init(1);
 
     out_pipe: windows.HANDLE,
     in_pipe: windows.HANDLE,
diff --git a/src/termio/Exec.zig b/src/termio/Exec.zig
index 9b4631a22..169228c63 100644
--- a/src/termio/Exec.zig
+++ b/src/termio/Exec.zig
@@ -762,7 +762,7 @@ const Subprocess = struct {
             // Copy it with a hyphen so its a login shell
             const argv0_buf = try alloc.alloc(u8, argv0.len + 1);
             argv0_buf[0] = '-';
-            std.mem.copy(u8, argv0_buf[1..], argv0);
+            @memcpy(argv0_buf[1..], argv0);
             break :argv0 argv0_buf;
         } else null;
 
@@ -2120,7 +2120,7 @@ const StreamHandler = struct {
             return;
         }
 
-        std.mem.copy(u8, &buf, title);
+        @memcpy(buf[0..title.len], title);
         buf[title.len] = 0;
 
         // Mark that we've seen a title
diff --git a/src/termio/message.zig b/src/termio/message.zig
index e449960ad..955fa44ed 100644
--- a/src/termio/message.zig
+++ b/src/termio/message.zig
@@ -130,7 +130,7 @@ pub fn MessageData(comptime Elem: type, comptime small_size: comptime_int) type
                     // If it fits in our small request, do that.
                     if (data.len <= Small.Max) {
                         var buf: Small.Array = undefined;
-                        std.mem.copy(Elem, &buf, data);
+                        @memcpy(buf[0..data.len], data);
                         return Self{
                             .small = .{
                                 .data = buf,