diff --git a/Cargo.lock b/Cargo.lock
index 330d111f265f..e0976201d4d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -872,7 +872,7 @@ dependencies = [
  "petgraph",
  "rayon",
  "serde",
- "toml 0.5.11",
+ "toml 0.8.4",
 ]
 
 [[package]]
@@ -1942,7 +1942,7 @@ dependencies = [
  "smallvec",
  "static_assertions",
  "target-spec",
- "toml 0.5.11",
+ "toml 0.8.4",
 ]
 
 [[package]]
@@ -1980,7 +1980,7 @@ dependencies = [
  "semver",
  "serde",
  "serde_json",
- "toml 0.5.11",
+ "toml 0.8.4",
 ]
 
 [[package]]
@@ -2035,7 +2035,7 @@ dependencies = [
  "serde",
  "tabular",
  "target-spec",
- "toml 0.5.11",
+ "toml 0.8.4",
  "toml_edit 0.17.1",
  "twox-hash",
 ]
@@ -3246,9 +3246,9 @@ dependencies = [
 
 [[package]]
 name = "serde_spanned"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96426c9936fd7a0124915f9185ea1d20aa9445cc9821142f0a73bc9207a2e186"
+checksum = "12022b835073e5b11e90a14f86838ceb1c8fb0325b72416845c487ac0fa95e80"
 dependencies = [
  "serde",
 ]
@@ -3495,7 +3495,7 @@ dependencies = [
  "serde_json",
  "target-lexicon",
  "test-case",
- "toml 0.5.11",
+ "toml 0.8.4",
  "unicode-ident",
 ]
 
@@ -3692,10 +3692,23 @@ checksum = "c17e963a819c331dcacd7ab957d80bc2b9a9c1e71c804826d2f283dd65306542"
 dependencies = [
  "serde",
  "serde_spanned",
- "toml_datetime 0.6.3",
+ "toml_datetime 0.6.5",
  "toml_edit 0.19.14",
 ]
 
+[[package]]
+name = "toml"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2ef75d881185fd2df4a040793927c153d863651108a93c7e17a9e591baa95cc6"
+dependencies = [
+ "indexmap 2.0.2",
+ "serde",
+ "serde_spanned",
+ "toml_datetime 0.6.5",
+ "toml_edit 0.20.4",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.5.1"
@@ -3704,9 +3717,9 @@ checksum = "4553f467ac8e3d374bc9a177a26801e5d0f9b211aa1673fb137a403afd1c9cf5"
 
 [[package]]
 name = "toml_datetime"
-version = "0.6.3"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7cda73e2f1397b1262d6dfdcef8aafae14d1de7748d66822d3bfeeb6d03e5e4b"
+checksum = "3550f4e9685620ac18a50ed434eb3aec30db8ba93b0287467bca5826ea25baf1"
 dependencies = [
  "serde",
 ]
@@ -3732,7 +3745,20 @@ dependencies = [
  "indexmap 2.0.2",
  "serde",
  "serde_spanned",
- "toml_datetime 0.6.3",
+ "toml_datetime 0.6.5",
+ "winnow",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.20.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380f9e8120405471f7c9ad1860a713ef5ece6a670c7eae39225e477340f32fc4"
+dependencies = [
+ "indexmap 2.0.2",
+ "serde",
+ "serde_spanned",
+ "toml_datetime 0.6.5",
  "winnow",
 ]
 
diff --git a/guppy-summaries/Cargo.toml b/guppy-summaries/Cargo.toml
index 8fd9a5265bea..8730e856911f 100644
--- a/guppy-summaries/Cargo.toml
+++ b/guppy-summaries/Cargo.toml
@@ -28,7 +28,7 @@ all-features = true
 camino = { version = "1.1.6", features = ["serde1"] }
 cfg-if = "1.0.0"
 diffus = "0.10.0"
-toml = { version = "0.5.11", features = ["preserve_order"] }
+toml = { version = "0.8.4", features = ["preserve_order"] }
 semver = { version = "1.0.20", features = ["serde"] }
 serde = { version = "1.0.189", features = ["derive"] }
 guppy-workspace-hack.workspace = true
diff --git a/guppy/Cargo.toml b/guppy/Cargo.toml
index 615efdd608d2..3cc5233dc823 100644
--- a/guppy/Cargo.toml
+++ b/guppy/Cargo.toml
@@ -50,7 +50,7 @@ serde_json = "1.0.107"
 smallvec = "1.11.1"
 static_assertions = "1.1.0"
 target-spec = { version = "3.0.1", path = "../target-spec" }
-toml = { version = "0.5.11", optional = true, features = ["preserve_order"] }
+toml = { version = "0.8.4", optional = true, features = ["preserve_order"] }
 guppy-workspace-hack.workspace = true
 
 [dev-dependencies]
diff --git a/target-spec/Cargo.toml b/target-spec/Cargo.toml
index 202c398ca414..124206aaca7a 100644
--- a/target-spec/Cargo.toml
+++ b/target-spec/Cargo.toml
@@ -31,7 +31,7 @@ guppy-workspace-hack.workspace = true
 [dev-dependencies]
 rustc_version = "0.4.0"
 test-case = "3.2.1"
-toml = "0.5.11"
+toml = "0.8.4"
 
 [features]
 custom = ["dep:serde", "dep:serde_json"]
diff --git a/tools/determinator/Cargo.toml b/tools/determinator/Cargo.toml
index a1c804c1dbd0..1c05c93a78cb 100644
--- a/tools/determinator/Cargo.toml
+++ b/tools/determinator/Cargo.toml
@@ -37,7 +37,7 @@ petgraph = { version = "0.6.4", default-features = false, features = [
 ] }
 rayon = "1.8.0"
 serde = { version = "1.0.189", features = ["derive"] }
-toml = "0.5.11"
+toml = "0.8.4"
 guppy-workspace-hack.workspace = true
 
 [dev-dependencies]
diff --git a/tools/hakari/Cargo.toml b/tools/hakari/Cargo.toml
index 74227b598591..d6b288205175 100644
--- a/tools/hakari/Cargo.toml
+++ b/tools/hakari/Cargo.toml
@@ -40,7 +40,7 @@ rayon = "1.8.0"
 serde = { version = "1.0.189", features = ["derive"], optional = true }
 tabular = { version = "0.2.0", features = ["ansi-cell"], optional = true }
 target-spec = { version = "3.0.1", path = "../../target-spec" }
-toml = { version = "0.5.11", optional = true }
+toml = { version = "0.8.4", optional = true }
 toml_edit = "0.17.1"
 twox-hash = { version = "1.6.3", default-features = false }
 guppy-workspace-hack.workspace = true
diff --git a/workspace-hack/Cargo.toml b/workspace-hack/Cargo.toml
index 80dff68464a3..4f57a73c2e16 100644
--- a/workspace-hack/Cargo.toml
+++ b/workspace-hack/Cargo.toml
@@ -30,7 +30,7 @@ regex-automata = { version = "0.3.4", default-features = false, features = ["dfa
 semver = { version = "1.0.20", features = ["serde"] }
 serde = { version = "1.0.189", features = ["alloc", "derive"] }
 serde_json = { version = "1.0.107", features = ["unbounded_depth"] }
-toml = { version = "0.5.11", features = ["preserve_order"] }
+toml = { version = "0.8.4", features = ["preserve_order"] }
 
 [build-dependencies]
 proc-macro2 = { version = "1.0.66" }