diff --git a/lib/compiler/aro/aro/Target.zig b/lib/compiler/aro/aro/Target.zig
index 18743e1c66d0bae7d273be4b8f8a8f70422ead3c..a65a626a4fdf266b19285068688c8f8c5b995c4c 100644
--- a/lib/compiler/aro/aro/Target.zig
+++ b/lib/compiler/aro/aro/Target.zig
@@ -1293,7 +1293,6 @@ pub fn toLLVMTriple(target: *const Target, buf: []u8) []const u8 {
     const llvm_os = switch (target.os.tag) {
         .amdhsa => "amdhsa",
         .amdpal => "amdpal",
-        .contiki => "contiki",
         .cuda => "cuda",
         .dragonfly => "dragonfly",
         .driverkit => "driverkit",
diff --git a/lib/std/Build/Configuration.zig b/lib/std/Build/Configuration.zig
index fe2dd424471b4f7524c169d18f423a5cd0fb1add..35bfabdbd62e828cb87c73a5210ec6cc0fb2d578 100644
--- a/lib/std/Build/Configuration.zig
+++ b/lib/std/Build/Configuration.zig
@@ -2379,7 +2379,6 @@ pub const TargetQuery = struct {
     pub const OsTag = enum(u6) {
         freestanding,
         other,
-        contiki,
         fuchsia,
         managarm,
         haiku,
diff --git a/lib/std/Target.zig b/lib/std/Target.zig
index cd9c8e3260535f929d08f724be7b48c517db9936..163ca548097642ddbd3fe38f84349c2da01e5afa 100644
--- a/lib/std/Target.zig
+++ b/lib/std/Target.zig
@@ -19,7 +19,6 @@ pub const Os = struct {
         freestanding,
         other,
 
-        contiki,
         fuchsia,
         managarm,
 
@@ -177,7 +176,6 @@ pub const Os = struct {
                 .ashetos,
                 => .none,
 
-                .contiki,
                 .fuchsia,
 
                 .rtems,
@@ -417,12 +415,6 @@ pub const Os = struct {
                 .ashetos,
                 => .{ .none = {} },
 
-                .contiki => .{
-                    .semver = .{
-                        .min = .{ .major = 5, .minor = 0, .patch = 0 },
-                        .max = .{ .major = 5, .minor = 1, .patch = 0 },
-                    },
-                },
                 .fuchsia => .{
                     .semver = .{
                         .min = .{ .major = 27, .minor = 0, .patch = 0 },
@@ -946,7 +938,6 @@ pub const Abi = enum {
 
             .ashetos => .eabi,
 
-            .contiki,
             .illumos,
             .managarm,
             .plan9,
@@ -2333,7 +2324,6 @@ pub fn requiresLibC(target: *const Target) bool {
         .psp,
         .vita,
         .mesa3d,
-        .contiki,
         .amdpal,
         .hurd,
         .wasi,
@@ -2484,7 +2474,6 @@ pub const DynamicLinker = struct {
             .freestanding,
             .other,
 
-            .contiki,
             .managarm, // Needs to be double-checked.
 
             .plan9,
@@ -2917,8 +2906,6 @@ pub const DynamicLinker = struct {
             .freestanding,
             .other,
 
-            .contiki,
-
             .plan9,
             .rtems,
 
@@ -3557,7 +3544,6 @@ pub fn cTypeBitSize(target: *const Target, c_type: CType) ?u16 {
         .opengl => null,
 
         .ps3,
-        .contiki,
         .managarm,
         => @panic("specify the C integer and float type sizes for this OS"),
     };
diff --git a/lib/std/zig/llvm/Builder.zig b/lib/std/zig/llvm/Builder.zig
index 7ba94f5e9eff4da4c665e1c31848d1302f8dbf83..69ace2c010f6dc626f576bf60e02a600dfe37421 100644
--- a/lib/std/zig/llvm/Builder.zig
+++ b/lib/std/zig/llvm/Builder.zig
@@ -282,7 +282,6 @@ pub fn tripleForTarget(allocator: Allocator, target: *const std.Target) ![]const
         .vulkan => "vulkan",
         .managarm => "managarm",
 
-        .contiki,
         .freestanding,
         .opencl, // https://llvm.org/docs/SPIRVUsage.html#target-triples
         .opengl,