diff --git a/import_map.json b/import_map.json
index d3fa27e61c..c01c0bb01b 100644
--- a/import_map.json
+++ b/import_map.json
@@ -17,6 +17,7 @@
     "@std/assert/less": "./tests/util/std/assert/less.ts",
     "@std/assert/less-or-equal": "./tests/util/std/assert/less_or_equal.ts",
     "@std/assert/match": "./tests/util/std/assert/match.ts",
+    "@std/assert/unstable-never": "./tests/util/std/assert/unstable_never.ts",
     "@std/assert/not-equals": "./tests/util/std/assert/not_equals.ts",
     "@std/assert/not-instance-of": "./tests/util/std/assert/not_instance_of.ts",
     "@std/assert/not-match": "./tests/util/std/assert/not_match.ts",
@@ -50,10 +51,14 @@
     "@std/bytes/last-index-of-needle": "./tests/util/std/bytes/last_index_of_needle.ts",
     "@std/bytes/repeat": "./tests/util/std/bytes/repeat.ts",
     "@std/bytes/starts-with": "./tests/util/std/bytes/starts_with.ts",
+    "@std/cache": "./tests/util/std/cache/mod.ts",
+    "@std/cache/lru-cache": "./tests/util/std/cache/lru_cache.ts",
+    "@std/cache/memoize": "./tests/util/std/cache/memoize.ts",
+    "@std/cache/ttl-cache": "./tests/util/std/cache/ttl_cache.ts",
     "@std/cli": "./tests/util/std/cli/mod.ts",
     "@std/cli/parse-args": "./tests/util/std/cli/parse_args.ts",
     "@std/cli/prompt-secret": "./tests/util/std/cli/prompt_secret.ts",
-    "@std/cli/spinner": "./tests/util/std/cli/spinner.ts",
+    "@std/cli/unstable-spinner": "./tests/util/std/cli/unstable_spinner.ts",
     "@std/cli/unicode-width": "./tests/util/std/cli/unicode_width.ts",
     "@std/collections": "./tests/util/std/collections/mod.ts",
     "@std/collections/aggregate-groups": "./tests/util/std/collections/aggregate_groups.ts",
@@ -111,6 +116,7 @@
     "@std/csv/stringify": "./tests/util/std/csv/stringify.ts",
     "@std/csv/stringify-stream": "./tests/util/std/csv/stringify_stream.ts",
     "@std/data-structures": "./tests/util/std/data_structures/mod.ts",
+    "@std/data-structures/unstable-bidirectional-map": "./tests/util/std/data_structures/unstable_bidirectional_map.ts",
     "@std/data-structures/binary-heap": "./tests/util/std/data_structures/binary_heap.ts",
     "@std/data-structures/binary-search-tree": "./tests/util/std/data_structures/binary_search_tree.ts",
     "@std/data-structures/comparators": "./tests/util/std/data_structures/comparators.ts",
@@ -130,10 +136,16 @@
     "@std/encoding": "./tests/util/std/encoding/mod.ts",
     "@std/encoding/ascii85": "./tests/util/std/encoding/ascii85.ts",
     "@std/encoding/base32": "./tests/util/std/encoding/base32.ts",
+    "@std/encoding/unstable-base32-stream": "./tests/util/std/encoding/unstable_base32_stream.ts",
+    "@std/encoding/unstable-base32hex": "./tests/util/std/encoding/unstable_base32hex.ts",
+    "@std/encoding/unstable-base32hex-stream": "./tests/util/std/encoding/unstable_base32hex_stream.ts",
     "@std/encoding/base58": "./tests/util/std/encoding/base58.ts",
     "@std/encoding/base64": "./tests/util/std/encoding/base64.ts",
+    "@std/encoding/unstable-base64-stream": "./tests/util/std/encoding/unstable_base64_stream.ts",
     "@std/encoding/base64url": "./tests/util/std/encoding/base64url.ts",
+    "@std/encoding/unstable-base64url-stream": "./tests/util/std/encoding/unstable_base64url_stream.ts",
     "@std/encoding/hex": "./tests/util/std/encoding/hex.ts",
+    "@std/encoding/unstable-hex-stream": "./tests/util/std/encoding/unstable_hex_stream.ts",
     "@std/encoding/varint": "./tests/util/std/encoding/varint.ts",
     "@std/expect": "./tests/util/std/expect/mod.ts",
     "@std/expect/expect": "./tests/util/std/expect/expect.ts",
@@ -148,6 +160,7 @@
     "@std/front-matter/test": "./tests/util/std/front_matter/test.ts",
     "@std/front-matter/toml": "./tests/util/std/front_matter/toml.ts",
     "@std/front-matter/yaml": "./tests/util/std/front_matter/yaml.ts",
+    "@std/front-matter/unstable-yaml": "./tests/util/std/front_matter/unstable_yaml.ts",
     "@std/front-matter/types": "./tests/util/std/front_matter/types.ts",
     "@std/fs": "./tests/util/std/fs/mod.ts",
     "@std/fs/copy": "./tests/util/std/fs/copy.ts",
@@ -163,16 +176,20 @@
     "@std/fs/walk": "./tests/util/std/fs/walk.ts",
     "@std/html": "./tests/util/std/html/mod.ts",
     "@std/html/entities": "./tests/util/std/html/entities.ts",
+    "@std/html/unstable-is-valid-custom-element-name": "./tests/util/std/html/unstable_is_valid_custom_element_name.ts",
     "@std/html/named-entity-list.json": "./tests/util/std/html/named_entity_list.json",
     "@std/http": "./tests/util/std/http/mod.ts",
     "@std/http/cookie": "./tests/util/std/http/cookie.ts",
     "@std/http/etag": "./tests/util/std/http/etag.ts",
     "@std/http/file-server": "./tests/util/std/http/file_server.ts",
+    "@std/http/unstable-header": "./tests/util/std/http/unstable_header.ts",
+    "@std/http/unstable-method": "./tests/util/std/http/unstable_method.ts",
     "@std/http/negotiation": "./tests/util/std/http/negotiation.ts",
     "@std/http/server-sent-event-stream": "./tests/util/std/http/server_sent_event_stream.ts",
     "@std/http/status": "./tests/util/std/http/status.ts",
-    "@std/http/signed-cookie": "./tests/util/std/http/signed_cookie.ts",
+    "@std/http/unstable-signed-cookie": "./tests/util/std/http/unstable_signed_cookie.ts",
     "@std/http/user-agent": "./tests/util/std/http/user_agent.ts",
+    "@std/http/unstable-route": "./tests/util/std/http/unstable_route.ts",
     "@std/ini": "./tests/util/std/ini/mod.ts",
     "@std/ini/parse": "./tests/util/std/ini/parse.ts",
     "@std/ini/stringify": "./tests/util/std/ini/stringify.ts",
@@ -243,7 +260,7 @@
     "@std/msgpack/encode": "./tests/util/std/msgpack/encode.ts",
     "@std/net": "./tests/util/std/net/mod.ts",
     "@std/net/get-available-port": "./tests/util/std/net/get_available_port.ts",
-    "@std/net/get-network-address": "./tests/util/std/net/get_network_address.ts",
+    "@std/net/unstable-get-network-address": "./tests/util/std/net/unstable_get_network_address.ts",
     "@std/path": "./tests/util/std/path/mod.ts",
     "@std/path/basename": "./tests/util/std/path/basename.ts",
     "@std/path/common": "./tests/util/std/path/common.ts",
@@ -280,11 +297,21 @@
     "@std/path/posix/resolve": "./tests/util/std/path/posix/resolve.ts",
     "@std/path/posix/to-file-url": "./tests/util/std/path/posix/to_file_url.ts",
     "@std/path/posix/to-namespaced-path": "./tests/util/std/path/posix/to_namespaced_path.ts",
+    "@std/path/posix/unstable-basename": "./tests/util/std/path/posix/unstable_basename.ts",
+    "@std/path/posix/unstable-dirname": "./tests/util/std/path/posix/unstable_dirname.ts",
+    "@std/path/posix/unstable-extname": "./tests/util/std/path/posix/unstable_extname.ts",
+    "@std/path/posix/unstable-join": "./tests/util/std/path/posix/unstable_join.ts",
+    "@std/path/posix/unstable-normalize": "./tests/util/std/path/posix/unstable_normalize.ts",
     "@std/path/relative": "./tests/util/std/path/relative.ts",
     "@std/path/resolve": "./tests/util/std/path/resolve.ts",
     "@std/path/to-file-url": "./tests/util/std/path/to_file_url.ts",
     "@std/path/to-namespaced-path": "./tests/util/std/path/to_namespaced_path.ts",
     "@std/path/types": "./tests/util/std/path/types.ts",
+    "@std/path/unstable-basename": "./tests/util/std/path/unstable_basename.ts",
+    "@std/path/unstable-dirname": "./tests/util/std/path/unstable_dirname.ts",
+    "@std/path/unstable-extname": "./tests/util/std/path/unstable_extname.ts",
+    "@std/path/unstable-join": "./tests/util/std/path/unstable_join.ts",
+    "@std/path/unstable-normalize": "./tests/util/std/path/unstable_normalize.ts",
     "@std/path/windows": "./tests/util/std/path/windows/mod.ts",
     "@std/path/windows/basename": "./tests/util/std/path/windows/basename.ts",
     "@std/path/windows/common": "./tests/util/std/path/windows/common.ts",
@@ -305,6 +332,17 @@
     "@std/path/windows/resolve": "./tests/util/std/path/windows/resolve.ts",
     "@std/path/windows/to-file-url": "./tests/util/std/path/windows/to_file_url.ts",
     "@std/path/windows/to-namespaced-path": "./tests/util/std/path/windows/to_namespaced_path.ts",
+    "@std/path/windows/unstable-basename": "./tests/util/std/path/windows/unstable_basename.ts",
+    "@std/path/windows/unstable-dirname": "./tests/util/std/path/windows/unstable_dirname.ts",
+    "@std/path/windows/unstable-extname": "./tests/util/std/path/windows/unstable_extname.ts",
+    "@std/path/windows/unstable-join": "./tests/util/std/path/windows/unstable_join.ts",
+    "@std/path/windows/unstable-normalize": "./tests/util/std/path/windows/unstable_normalize.ts",
+    "@std/random": "./tests/util/std/random/mod.ts",
+    "@std/random/between": "./tests/util/std/random/between.ts",
+    "@std/random/integer-between": "./tests/util/std/random/integer_between.ts",
+    "@std/random/sample": "./tests/util/std/random/sample.ts",
+    "@std/random/seeded": "./tests/util/std/random/seeded.ts",
+    "@std/random/shuffle": "./tests/util/std/random/shuffle.ts",
     "@std/regexp": "./tests/util/std/regexp/mod.ts",
     "@std/regexp/escape": "./tests/util/std/regexp/escape.ts",
     "@std/semver": "./tests/util/std/semver/mod.ts",
@@ -342,14 +380,19 @@
     "@std/streams/limited-bytes-transform-stream": "./tests/util/std/streams/limited_bytes_transform_stream.ts",
     "@std/streams/limited-transform-stream": "./tests/util/std/streams/limited_transform_stream.ts",
     "@std/streams/merge-readable-streams": "./tests/util/std/streams/merge_readable_streams.ts",
+    "@std/streams/unstable-fixed-chunk-stream": "./tests/util/std/streams/unstable_fixed_chunk_stream.ts",
     "@std/streams/text-delimiter-stream": "./tests/util/std/streams/text_delimiter_stream.ts",
     "@std/streams/text-line-stream": "./tests/util/std/streams/text_line_stream.ts",
     "@std/streams/to-array-buffer": "./tests/util/std/streams/to_array_buffer.ts",
     "@std/streams/to-blob": "./tests/util/std/streams/to_blob.ts",
     "@std/streams/to-json": "./tests/util/std/streams/to_json.ts",
+    "@std/streams/unstable-to-lines": "./tests/util/std/streams/unstable_to_lines.ts",
     "@std/streams/to-text": "./tests/util/std/streams/to_text.ts",
     "@std/streams/to-transform-stream": "./tests/util/std/streams/to_transform_stream.ts",
     "@std/streams/zip-readable-streams": "./tests/util/std/streams/zip_readable_streams.ts",
+    "@std/tar": "./tests/util/std/tar/mod.ts",
+    "@std/tar/tar-stream": "./tests/util/std/tar/tar_stream.ts",
+    "@std/tar/untar-stream": "./tests/util/std/tar/untar_stream.ts",
     "@std/testing/bdd": "./tests/util/std/testing/bdd.ts",
     "@std/testing/mock": "./tests/util/std/testing/mock.ts",
     "@std/testing/snapshot": "./tests/util/std/testing/snapshot.ts",
@@ -359,8 +402,9 @@
     "@std/text/closest-string": "./tests/util/std/text/closest_string.ts",
     "@std/text/compare-similarity": "./tests/util/std/text/compare_similarity.ts",
     "@std/text/levenshtein-distance": "./tests/util/std/text/levenshtein_distance.ts",
+    "@std/text/unstable-slugify": "./tests/util/std/text/unstable_slugify.ts",
     "@std/text/to-camel-case": "./tests/util/std/text/to_camel_case.ts",
-    "@std/text/to-constant-case": "./tests/util/std/text/to_constant_case.ts",
+    "@std/text/unstable-to-constant-case": "./tests/util/std/text/unstable_to_constant_case.ts",
     "@std/text/to-kebab-case": "./tests/util/std/text/to_kebab_case.ts",
     "@std/text/to-pascal-case": "./tests/util/std/text/to_pascal_case.ts",
     "@std/text/to-snake-case": "./tests/util/std/text/to_snake_case.ts",
@@ -372,12 +416,6 @@
     "@std/ulid/decode-time": "./tests/util/std/ulid/decode_time.ts",
     "@std/ulid/monotonic-ulid": "./tests/util/std/ulid/monotonic_ulid.ts",
     "@std/ulid/ulid": "./tests/util/std/ulid/ulid.ts",
-    "@std/url": "./tests/util/std/url/mod.ts",
-    "@std/url/basename": "./tests/util/std/url/basename.ts",
-    "@std/url/dirname": "./tests/util/std/url/dirname.ts",
-    "@std/url/extname": "./tests/util/std/url/extname.ts",
-    "@std/url/join": "./tests/util/std/url/join.ts",
-    "@std/url/normalize": "./tests/util/std/url/normalize.ts",
     "@std/uuid": "./tests/util/std/uuid/mod.ts",
     "@std/uuid/common": "./tests/util/std/uuid/common.ts",
     "@std/uuid/constants": "./tests/util/std/uuid/constants.ts",
@@ -385,6 +423,7 @@
     "@std/uuid/v3": "./tests/util/std/uuid/v3.ts",
     "@std/uuid/v4": "./tests/util/std/uuid/v4.ts",
     "@std/uuid/v5": "./tests/util/std/uuid/v5.ts",
+    "@std/uuid/unstable-v7": "./tests/util/std/uuid/unstable_v7.ts",
     "@std/webgpu": "./tests/util/std/webgpu/mod.ts",
     "@std/webgpu/create-capture": "./tests/util/std/webgpu/create_capture.ts",
     "@std/webgpu/describe-texture-format": "./tests/util/std/webgpu/describe_texture_format.ts",
diff --git a/tests/util/std b/tests/util/std
index 3ee4c4dd43..c5d7930d57 160000
--- a/tests/util/std
+++ b/tests/util/std
@@ -1 +1 @@
-Subproject commit 3ee4c4dd43ad3a38d1b09aa981332fae1e593ab6
+Subproject commit c5d7930d5700dbbbedea607f9cf3e50acdc33e2d