diff --git a/Cargo.lock b/Cargo.lock
index 8aba1495..3fc47ebe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -935,9 +935,9 @@ dependencies = [
 
 [[package]]
 name = "toml-test-data"
-version = "1.7.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad91e06583efe5577c6b123d4b53cb0fcbf66407b9f1f47084977d5db0ba132f"
+checksum = "c6b5bad99e813ce8c67d1d67c9b9f37c8451933f45eae0ab2b3583975f1cc15d"
 dependencies = [
  "include_dir",
 ]
diff --git a/crates/toml/Cargo.toml b/crates/toml/Cargo.toml
index 8d1727ad..8130265c 100644
--- a/crates/toml/Cargo.toml
+++ b/crates/toml/Cargo.toml
@@ -50,7 +50,7 @@ serde_spanned = { version = "0.6.5", path = "../serde_spanned", features = ["ser
 serde = { version = "1.0.160", features = ["derive"] }
 serde_json = "1.0.96"
 toml-test-harness = "0.4.8"
-toml-test-data = "1.7.0"
+toml-test-data = "1.8.0"
 snapbox = "0.4.11"
 
 [[test]]
diff --git a/crates/toml_edit/Cargo.toml b/crates/toml_edit/Cargo.toml
index 744b3a02..5eb76590 100644
--- a/crates/toml_edit/Cargo.toml
+++ b/crates/toml_edit/Cargo.toml
@@ -50,7 +50,7 @@ serde_spanned = { version = "0.6.5", path = "../serde_spanned", features = ["ser
 [dev-dependencies]
 serde_json = "1.0.96"
 toml-test-harness = "0.4.8"
-toml-test-data = "1.7.0"
+toml-test-data = "1.8.0"
 libtest-mimic = "0.6.0"
 snapbox = { version = "0.4.11", features = ["harness"] }
 
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-1.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-01.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-1.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-01.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-2.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-02.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-2.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-02.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-3.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-03.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-3.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-03.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-4.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-04.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-4.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-04.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-5.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-05.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-5.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-05.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-6.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-06.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-6.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-06.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-7.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-07.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-7.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-07.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-8.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-08.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-8.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-08.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-9.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-09.stderr
similarity index 100%
rename from crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-9.stderr
rename to crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-09.stderr
diff --git a/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-10.stderr b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-10.stderr
new file mode 100644
index 00000000..18af75a0
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/inline-table/overwrite-10.stderr
@@ -0,0 +1,5 @@
+TOML parse error at line 4, column 6
+  |
+4 | a = {b.a = 1, b = 2, b.c = 3}
+  |      ^
+duplicate key `b`