diff --git a/manifest/main.ml b/manifest/main.ml
index 1a29d2fbb15d9157abb53e75ba34699dce982929..ebfa8ee5cebbb9a3a36ca0e9f997f2d70ea65645 100644
--- a/manifest/main.ml
+++ b/manifest/main.ml
@@ -480,7 +480,7 @@ let octez_stdlib =
     ~foreign_stubs:{language = C; flags = []; names = ["tzBytes_c"]}
 
 let _octez_stdlib_tests =
-  tests
+  tezt
     [
       "test_bits";
       "test_tzList";
@@ -490,6 +490,7 @@ let _octez_stdlib_tests =
       "test_functionalArray";
       "test_hash_queue";
       "test_tzBytes";
+      "test_arrays";
     ]
     ~path:"src/lib_stdlib/test"
     ~opam:"tezos-stdlib"
@@ -497,7 +498,7 @@ let _octez_stdlib_tests =
     ~deps:
       [
         octez_stdlib |> open_;
-        alcotest;
+        alcotezt;
         bigstring;
         octez_test_helpers |> open_;
         qcheck_alcotest;
@@ -505,7 +506,7 @@ let _octez_stdlib_tests =
     ~js_compatible:true
 
 let _octez_stdlib_test_unix =
-  tests
+  tezt
     [
       "test_lwt_pipe";
       "test_circular_buffer";
@@ -517,8 +518,7 @@ let _octez_stdlib_test_unix =
     ~deps:
       [
         octez_stdlib |> open_;
-        alcotest;
-        alcotest_lwt;
+        alcotezt;
         lwt_log;
         bigstring;
         lwt_unix;
@@ -1037,8 +1037,8 @@ let octez_stdlib_unix =
       ]
 
 let _octez_stdlib_unix_test =
-  test
-    "test_key_value_store_fuzzy"
+  tezt
+    ["test_key_value_store_fuzzy"]
     ~path:"src/lib_stdlib_unix/test/"
     ~opam:"tezos-stdlib-unix"
     ~deps:
@@ -1046,7 +1046,7 @@ let _octez_stdlib_unix_test =
         octez_error_monad |> open_ |> open_ ~m:"TzLwtreslib";
         octez_stdlib_unix |> open_;
         qcheck_alcotest;
-        alcotest_lwt;
+        alcotezt;
       ]
 
 let octez_clic =
diff --git a/opam/tezos-stdlib-unix.opam b/opam/tezos-stdlib-unix.opam
index ec825979b16eb38d376c7108d02b584b4abcb682..4e25077d3fe9dd43c95c358a392a68a08db1857c 100644
--- a/opam/tezos-stdlib-unix.opam
+++ b/opam/tezos-stdlib-unix.opam
@@ -26,12 +26,14 @@ depends: [
   "lwt_log"
   "conf-libev"
   "uri" { >= "3.1.0" }
+  "tezt" { with-test & >= "3.0.0" }
   "qcheck-alcotest" { with-test & >= "0.20" }
-  "alcotest-lwt" { with-test & >= "1.5.0" }
+  "octez-alcotezt" {with-test}
 ]
 build: [
   ["rm" "-r" "vendors"]
   ["dune" "build" "-p" name "-j" jobs]
   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+  ["dune" "build" "@runtezt" "-p" name "-j" jobs] {with-test}
 ]
 synopsis: "Tezos: yet-another local-extension of the OCaml standard library (unix-specific fragment)"
diff --git a/opam/tezos-stdlib.opam b/opam/tezos-stdlib.opam
index 7581d2f6a3a6e7f4ac9695c4135e7926d164e758..f3bd79d8188e3df4f6dfd34a250dc9f94c5d9ce3 100644
--- a/opam/tezos-stdlib.opam
+++ b/opam/tezos-stdlib.opam
@@ -16,16 +16,17 @@ depends: [
   "zarith_stubs_js"
   "lwt" { >= "5.6.0" }
   "aches" { >= "1.0.0" }
-  "alcotest" { with-test & >= "1.5.0" }
+  "tezt" { with-test & >= "3.0.0" }
+  "octez-alcotezt" {with-test}
   "bigstring" {with-test}
   "tezos-test-helpers" {with-test}
   "qcheck-alcotest" { with-test & >= "0.20" }
-  "alcotest-lwt" { with-test & >= "1.5.0" }
   "lwt_log" {with-test}
 ]
 build: [
   ["rm" "-r" "vendors"]
   ["dune" "build" "-p" name "-j" jobs]
   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
+  ["dune" "build" "@runtezt" "-p" name "-j" jobs] {with-test}
 ]
 synopsis: "Tezos: yet-another local-extension of the OCaml standard library"
diff --git a/src/lib_stdlib/test-unix/dune b/src/lib_stdlib/test-unix/dune
index d003644b17dfd28da0a42f689abd780a98f0509a..6168adb3e6a9ea37c4980da7a60c81ccb3c68d86 100644
--- a/src/lib_stdlib/test-unix/dune
+++ b/src/lib_stdlib/test-unix/dune
@@ -1,42 +1,41 @@
 ; This file was automatically generated, do not edit.
 ; Edit file manifest/main.ml instead.
 
-(executables
- (names
-  test_lwt_pipe
-  test_circular_buffer
-  test_circular_buffer_fuzzy
-  test_hash_queue_lwt)
+(library
+ (name src_lib_stdlib_test_unix_tezt_lib)
+ (instrumentation (backend bisect_ppx))
  (libraries
+  tezt.core
   tezos-stdlib
-  alcotest
-  alcotest-lwt
+  octez-alcotezt
   lwt_log
   bigstring
   lwt.unix
   tezos-test-helpers
   qcheck-alcotest)
+ (library_flags (:standard -linkall))
  (flags
   (:standard)
+  -open Tezt_core
+  -open Tezt_core.Base
   -open Tezos_stdlib
-  -open Tezos_test_helpers))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_lwt_pipe.exe})))
+  -open Octez_alcotezt
+  -open Tezos_test_helpers)
+ (modules
+  test_lwt_pipe
+  test_circular_buffer
+  test_circular_buffer_fuzzy
+  test_hash_queue_lwt))
 
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_circular_buffer.exe})))
+(executable
+ (name main)
+ (libraries
+  src_lib_stdlib_test_unix_tezt_lib
+  tezt)
+ (modules main))
 
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_circular_buffer_fuzzy.exe})))
+(rule (alias runtezt) (package tezos-stdlib) (action (run %{dep:./main.exe})))
 
 (rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_hash_queue_lwt.exe})))
+ (targets main.ml)
+ (action (with-stdout-to %{targets} (echo "let () = Tezt.Test.run ()"))))
diff --git a/src/lib_stdlib/test-unix/test_circular_buffer.ml b/src/lib_stdlib/test-unix/test_circular_buffer.ml
index f315f9260cd598588f8ae49de6954b985c3e8cbc..4dc3908cab9c8390d3e4ff9252b92cc0caf51c07 100644
--- a/src/lib_stdlib/test-unix/test_circular_buffer.ml
+++ b/src/lib_stdlib/test-unix/test_circular_buffer.ml
@@ -359,7 +359,6 @@ let wrap n f =
 
 let () =
   Alcotest.run
-    ~argv:[|""|]
     "tezos-stdlib"
     (List.map
        (fun (run, descr) ->
diff --git a/src/lib_stdlib/test/dune b/src/lib_stdlib/test/dune
index f5e0fa6d2268673eca119ca85e1da46dccfe2afc..fb6ca69fe289c94c612408cf797f479abd7c4ee2 100644
--- a/src/lib_stdlib/test/dune
+++ b/src/lib_stdlib/test/dune
@@ -1,105 +1,64 @@
 ; This file was automatically generated, do not edit.
 ; Edit file manifest/main.ml instead.
 
-(executables
- (names
-  test_bits
-  test_tzList
-  test_bounded_heap
-  test_tzString
-  test_fallbackArray
-  test_functionalArray
-  test_hash_queue
-  test_tzBytes)
- (modes native js)
+(library
+ (name src_lib_stdlib_test_tezt_lib)
+ (instrumentation (backend bisect_ppx))
  (libraries
+  tezt.core
   tezos-stdlib
-  alcotest
+  octez-alcotezt
   bigstring
   tezos-test-helpers
   qcheck-alcotest)
  (js_of_ocaml)
+ (library_flags (:standard -linkall))
  (flags
   (:standard)
+  -open Tezt_core
+  -open Tezt_core.Base
   -open Tezos_stdlib
-  -open Tezos_test_helpers))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_bits.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_tzList.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_bounded_heap.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_tzString.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_fallbackArray.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_functionalArray.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_hash_queue.exe})))
-
-(rule
- (alias runtest)
- (package tezos-stdlib)
- (action (run %{dep:./test_tzBytes.exe})))
-
-(rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_bits.bc.js})))
-
-(rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_tzList.bc.js})))
+  -open Octez_alcotezt
+  -open Tezos_test_helpers)
+ (modules
+  test_bits
+  test_tzList
+  test_bounded_heap
+  test_tzString
+  test_fallbackArray
+  test_functionalArray
+  test_hash_queue
+  test_tzBytes
+  test_arrays))
 
-(rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_bounded_heap.bc.js})))
+(executable
+ (name main)
+ (modes native)
+ (libraries
+  src_lib_stdlib_test_tezt_lib
+  tezt)
+ (modules main))
 
-(rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_tzString.bc.js})))
+(rule (alias runtezt) (package tezos-stdlib) (action (run %{dep:./main.exe})))
 
 (rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_fallbackArray.bc.js})))
+ (targets main.ml)
+ (action (with-stdout-to %{targets} (echo "let () = Tezt.Test.run ()"))))
 
-(rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_functionalArray.bc.js})))
+(executable
+ (name main_js)
+ (modes js)
+ (libraries
+  src_lib_stdlib_test_tezt_lib
+  tezt.js)
+ (js_of_ocaml)
+ (modules main_js))
 
 (rule
- (alias runtest_js)
+ (alias runtezt_js)
  (package tezos-stdlib)
- (action (run node %{dep:./test_hash_queue.bc.js})))
+ (action (run node %{dep:./main_js.bc.js})))
 
 (rule
- (alias runtest_js)
- (package tezos-stdlib)
- (action (run node %{dep:./test_tzBytes.bc.js})))
+ (targets main_js.ml)
+ (action (with-stdout-to %{targets} (echo "let () = Tezt_js.Test.run ()"))))
diff --git a/src/lib_stdlib_unix/test/dune b/src/lib_stdlib_unix/test/dune
index ed0a034ba0d75cda0184327d7dc2bd5101f4847b..5210e8034e4ae0895b621017a5644272a0d66b6a 100644
--- a/src/lib_stdlib_unix/test/dune
+++ b/src/lib_stdlib_unix/test/dune
@@ -1,20 +1,38 @@
 ; This file was automatically generated, do not edit.
 ; Edit file manifest/main.ml instead.
 
-(executable
- (name test_key_value_store_fuzzy)
+(library
+ (name src_lib_stdlib_unix_test__tezt_lib)
+ (instrumentation (backend bisect_ppx))
  (libraries
+  tezt.core
   tezos-error-monad
   tezos-stdlib-unix
   qcheck-alcotest
-  alcotest-lwt)
+  octez-alcotezt)
+ (library_flags (:standard -linkall))
  (flags
   (:standard)
+  -open Tezt_core
+  -open Tezt_core.Base
   -open Tezos_error_monad
   -open Tezos_error_monad.TzLwtreslib
-  -open Tezos_stdlib_unix))
+  -open Tezos_stdlib_unix
+  -open Octez_alcotezt)
+ (modules test_key_value_store_fuzzy))
+
+(executable
+ (name main)
+ (libraries
+  src_lib_stdlib_unix_test__tezt_lib
+  tezt)
+ (modules main))
 
 (rule
- (alias runtest)
+ (alias runtezt)
  (package tezos-stdlib-unix)
- (action (run %{dep:./test_key_value_store_fuzzy.exe})))
+ (action (run %{dep:./main.exe})))
+
+(rule
+ (targets main.ml)
+ (action (with-stdout-to %{targets} (echo "let () = Tezt.Test.run ()"))))
diff --git a/src/lib_stdlib_unix/test/test_key_value_store_fuzzy.ml b/src/lib_stdlib_unix/test/test_key_value_store_fuzzy.ml
index 621f9004e12c94ec89b6bee43d82a3e68d330264..ad778a73ca0f383f7f9cf0ba985ed6f60ff6d6e1 100644
--- a/src/lib_stdlib_unix/test/test_key_value_store_fuzzy.ml
+++ b/src/lib_stdlib_unix/test/test_key_value_store_fuzzy.ml
@@ -497,4 +497,10 @@ let parallel_test =
       | Error err ->
           QCheck2.Test.fail_reportf "%a@." Error_monad.pp_print_trace err)
 
-let () = QCheck_base_runner.run_tests_main [sequential_test; parallel_test]
+let () =
+  Alcotest.run
+    "test-key-value-store-fuzzy"
+    [
+      ("sequential", [QCheck_alcotest.to_alcotest sequential_test]);
+      ("parallel", [QCheck_alcotest.to_alcotest parallel_test]);
+    ]
diff --git a/tezt/tests/dune b/tezt/tests/dune
index c8bd0f1d30af6aefcdd51a3e8f23d9b9ea7fd377..cfed44a9ad952f014132c7abe8116f43f084742c 100644
--- a/tezt/tests/dune
+++ b/tezt/tests/dune
@@ -16,6 +16,9 @@
   src_proto_alpha_lib_protocol_test_regression_tezt_lib
   src_proto_016_PtMumbai_lib_protocol_test_regression_tezt_lib
   src_proto_015_PtLimaPt_lib_protocol_test_regression_tezt_lib
+  src_lib_stdlib_unix_test__tezt_lib
+  src_lib_stdlib_test_unix_tezt_lib
+  src_lib_stdlib_test_tezt_lib
   src_lib_p2p_tezt_tezt_lib
   src_lib_lwt_result_stdlib_test_tezt_lib
   src_lib_error_monad_test_tezt_lib