diff --git a/Cargo.lock b/Cargo.lock
index 857459e5..07d8f9a4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -913,9 +913,9 @@ dependencies = [
 
 [[package]]
 name = "toml-test-data"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0082ae0d631f97530e98829c4101ae3ce3f1821a88f0a04be4fc3eaca5e7ed2d"
+checksum = "b6d7b3654ed31d96108843e2cc72cba3a3a04a86a3b8bacf64a7fbf95dcd9dfc"
 dependencies = [
  "include_dir",
 ]
diff --git a/crates/toml/Cargo.toml b/crates/toml/Cargo.toml
index d9d9f9fb..7086f5f6 100644
--- a/crates/toml/Cargo.toml
+++ b/crates/toml/Cargo.toml
@@ -50,7 +50,7 @@ serde_spanned = { version = "0.6.4", 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 = "1.4.0"
+toml-test-data = "1.5.0"
 snapbox = "0.4.11"
 
 [[test]]
diff --git a/crates/toml_edit/Cargo.toml b/crates/toml_edit/Cargo.toml
index 5025856f..738736cd 100644
--- a/crates/toml_edit/Cargo.toml
+++ b/crates/toml_edit/Cargo.toml
@@ -50,7 +50,7 @@ serde_spanned = { version = "0.6.4", path = "../serde_spanned", features = ["ser
 [dev-dependencies]
 serde_json = "1.0.96"
 toml-test-harness = "0.4.8"
-toml-test-data = "1.4.0"
+toml-test-data = "1.5.0"
 libtest-mimic = "0.6.0"
 snapbox = { version = "0.4.11", features = ["harness"] }
 
diff --git a/crates/toml_edit/tests/fixtures/invalid/float/exp-point-3.stderr b/crates/toml_edit/tests/fixtures/invalid/float/exp-point-3.stderr
new file mode 100644
index 00000000..873791ca
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/float/exp-point-3.stderr
@@ -0,0 +1,6 @@
+TOML parse error at line 1, column 17
+  |
+1 | exp-point-3 = 3.e+20
+  |                 ^
+invalid floating-point number
+expected digit
diff --git a/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-1.stderr b/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-1.stderr
new file mode 100644
index 00000000..254bdf20
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-1.stderr
@@ -0,0 +1,6 @@
+TOML parse error at line 1, column 23
+  |
+1 | exp-trailing-us-1 = 1_e2
+  |                       ^
+invalid integer
+expected digit
diff --git a/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-2.stderr b/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-2.stderr
new file mode 100644
index 00000000..b2986ad6
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/float/exp-trailing-us-2.stderr
@@ -0,0 +1,6 @@
+TOML parse error at line 1, column 25
+  |
+1 | exp-trailing-us-2 = 1.2_e2
+  |                         ^
+invalid floating-point number
+expected digit, digit
diff --git a/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-1.stderr b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-1.stderr
new file mode 100644
index 00000000..c58dd3c3
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-1.stderr
@@ -0,0 +1,5 @@
+TOML parse error at line 2, column 1
+  |
+2 | name = "Pradyun"
+  | ^
+duplicate key `name` in document root
diff --git a/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-2.stderr b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-2.stderr
new file mode 100644
index 00000000..74149f85
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-2.stderr
@@ -0,0 +1,5 @@
+TOML parse error at line 2, column 1
+  |
+2 | dupe = true
+  | ^
+duplicate key `dupe` in document root
diff --git a/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-3.stderr b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-3.stderr
new file mode 100644
index 00000000..94a019fd
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-3.stderr
@@ -0,0 +1,5 @@
+TOML parse error at line 2, column 1
+  |
+2 | "spelling" = "favourite"
+  | ^
+duplicate key `spelling` in document root
diff --git a/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-4.stderr b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-4.stderr
new file mode 100644
index 00000000..2bd02ab1
--- /dev/null
+++ b/crates/toml_edit/tests/fixtures/invalid/key/duplicate-keys-4.stderr
@@ -0,0 +1,5 @@
+TOML parse error at line 2, column 1
+  |
+2 | 'spelling' = "favourite"
+  | ^
+duplicate key `spelling` in document root