diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0490ae968..adf3f9bdc 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -58,7 +58,7 @@ repos:
           - py>=1.8.2
           - attrs>=19.2.0
           - packaging
-          - types-toml
+          - tomli
           - types-pkg_resources
 -   repo: local
     hooks:
diff --git a/AUTHORS b/AUTHORS
index 5c3610e69..16a53d94b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -302,6 +302,7 @@ Sven-Hendrik Haase
 Sylvain Marié
 Tadek Teleżyński
 Takafumi Arakaki
+Taneli Hukkinen
 Tanvi Mehta
 Tarcisio Fischer
 Tareq Alayan
diff --git a/changelog/8789.feature.rst b/changelog/8789.feature.rst
new file mode 100644
index 000000000..198d9ade3
--- /dev/null
+++ b/changelog/8789.feature.rst
@@ -0,0 +1 @@
+Support TOML v1.0.0 syntax in ``pyproject.toml``.
diff --git a/setup.cfg b/setup.cfg
index 0e86f10e7..094dfed87 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -47,7 +47,7 @@ install_requires =
     packaging
     pluggy>=0.12,<1.0.0a1
     py>=1.8.2
-    toml
+    tomli>=1.0.0,<2.0.0
     atomicwrites>=1.0;sys_platform=="win32"
     colorama;sys_platform=="win32"
     importlib-metadata>=0.12;python_version<"3.8"
diff --git a/src/_pytest/config/findpaths.py b/src/_pytest/config/findpaths.py
index 7dde4b92d..62214f8d9 100644
--- a/src/_pytest/config/findpaths.py
+++ b/src/_pytest/config/findpaths.py
@@ -64,9 +64,9 @@ def load_config_dict_from_file(
 
     # '.toml' files are considered if they contain a [tool.pytest.ini_options] table.
     elif filepath.suffix == ".toml":
-        import toml
+        import tomli
 
-        config = toml.load(str(filepath))
+        config = tomli.loads(filepath.read_text(encoding="utf-8"))
 
         result = config.get("tool", {}).get("pytest", {}).get("ini_options", None)
         if result is not None:
diff --git a/testing/test_findpaths.py b/testing/test_findpaths.py
index af6aeb3a5..3c876d96b 100644
--- a/testing/test_findpaths.py
+++ b/testing/test_findpaths.py
@@ -77,6 +77,7 @@ class TestLoadConfigDictFromFile:
             y = 20.0
             values = ["tests", "integration"]
             name = "foo"
+            heterogeneous_array = [1, "str"]
             """
             ),
             encoding="utf-8",
@@ -86,6 +87,7 @@ class TestLoadConfigDictFromFile:
             "y": "20.0",
             "values": ["tests", "integration"],
             "name": "foo",
+            "heterogeneous_array": [1, "str"],
         }