diff --git a/pkg/macos/os/log.zig b/pkg/macos/os/log.zig
index 32ecb3296..219c914da 100644
--- a/pkg/macos/os/log.zig
+++ b/pkg/macos/os/log.zig
@@ -32,10 +32,11 @@ pub const Log = opaque {
         comptime format: []const u8,
         args: anytype,
     ) void {
-        const str = nosuspend std.fmt.allocPrintZ(
+        const str = nosuspend std.fmt.allocPrintSentinel(
             alloc,
             format,
             args,
+            0,
         ) catch return;
         defer alloc.free(str);
         zig_os_log_with_type(self, typ, str.ptr);
diff --git a/src/apprt/embedded.zig b/src/apprt/embedded.zig
index 08d8291ef..617557995 100644
--- a/src/apprt/embedded.zig
+++ b/src/apprt/embedded.zig
@@ -266,8 +266,8 @@ pub const App = struct {
         // embedded apprt.
         self.performPreAction(target, action, value);
 
-        log.debug("dispatching action target={s} action={} value={}", .{
-            @tagName(target),
+        log.debug("dispatching action target={t} action={} value={any}", .{
+            target,
             action,
             value,
         });
@@ -1910,7 +1910,7 @@ pub const CAPI = struct {
         };
 
         return ptr.core_surface.performBindingAction(action) catch |err| {
-            log.err("error performing binding action action={} err={}", .{ action, err });
+            log.err("error performing binding action action={f} err={}", .{ action, err });
             return false;
         };
     }
diff --git a/src/crash/sentry.zig b/src/crash/sentry.zig
index 820c3e9a1..555b70fe9 100644
--- a/src/crash/sentry.zig
+++ b/src/crash/sentry.zig
@@ -265,8 +265,8 @@ pub const Transport = struct {
         const json = envelope.serialize();
         defer sentry.free(@ptrCast(json.ptr));
         var parsed: crash.Envelope = parsed: {
-            var fbs = std.io.fixedBufferStream(json);
-            break :parsed try crash.Envelope.parse(alloc, fbs.reader());
+            var reader: std.Io.Reader = .fixed(json);
+            break :parsed try crash.Envelope.parse(alloc, &reader);
         };
         defer parsed.deinit();
 
@@ -298,7 +298,10 @@ pub const Transport = struct {
         });
         const file = try std.fs.cwd().createFile(path, .{});
         defer file.close();
-        try file.writer().writeAll(json);
+        var buf: [4096]u8 = undefined;
+        var file_writer = file.writer(&buf);
+        try file_writer.interface.writeAll(json);
+        try file_writer.end();
 
         log.warn("crash report written to disk path={s}", .{path});
     }
diff --git a/src/termio/Exec.zig b/src/termio/Exec.zig
index d822377c9..481b994db 100644
--- a/src/termio/Exec.zig
+++ b/src/termio/Exec.zig
@@ -1440,7 +1440,7 @@ fn execCommand(
             // grow if necessary for a longer command (uncommon).
             9,
         );
-        defer args.deinit();
+        defer args.deinit(alloc);
 
         // The reason for executing login this way is unclear. This
         // comment will attempt to explain but prepare for a truly
@@ -1487,40 +1487,41 @@ fn execCommand(
         // macOS.
         //
         // Awesome.
-        try args.append("/usr/bin/login");
-        if (hush) try args.append("-q");
-        try args.append("-flp");
-        try args.append(username);
+        try args.append(alloc, "/usr/bin/login");
+        if (hush) try args.append(alloc, "-q");
+        try args.append(alloc, "-flp");
+        try args.append(alloc, username);
 
         switch (command) {
             // Direct args can be passed directly to login, since
             // login uses execvp we don't need to worry about PATH
             // searching.
-            .direct => |v| try args.appendSlice(v),
+            .direct => |v| try args.appendSlice(alloc, v),
 
             .shell => |v| {
                 // Use "exec" to replace the bash process with
                 // our intended command so we don't have a parent
                 // process hanging around.
-                const cmd = try std.fmt.allocPrintZ(
+                const cmd = try std.fmt.allocPrintSentinel(
                     alloc,
                     "exec -l {s}",
                     .{v},
+                    0,
                 );
 
                 // We execute bash with "--noprofile --norc" so that it doesn't
                 // load startup files so that (1) our shell integration doesn't
                 // break and (2) user configuration doesn't mess this process
                 // up.
-                try args.append("/bin/bash");
-                try args.append("--noprofile");
-                try args.append("--norc");
-                try args.append("-c");
-                try args.append(cmd);
+                try args.append(alloc, "/bin/bash");
+                try args.append(alloc, "--noprofile");
+                try args.append(alloc, "--norc");
+                try args.append(alloc, "-c");
+                try args.append(alloc, cmd);
             },
         }
 
-        return try args.toOwnedSlice();
+        return try args.toOwnedSlice(alloc);
     }
 
     return switch (command) {