diff --git a/cargo-guppy/Cargo.toml b/cargo-guppy/Cargo.toml
index dc410c7b990..54d6011583d 100644
--- a/cargo-guppy/Cargo.toml
+++ b/cargo-guppy/Cargo.toml
@@ -17,6 +17,6 @@ guppy-cmdlib = { path = "../guppy-cmdlib" }
 itertools = "0.13.0"
 pathdiff = { version = "0.2.1", features = ["camino"] }
 serde = { version = "1.0.204", features = ["derive"] }
-serde_json = "1.0.117"
+serde_json = "1.0.133"
 toml_edit = "0.17.1"
 guppy-workspace-hack.workspace = true
diff --git a/guppy-summaries/Cargo.toml b/guppy-summaries/Cargo.toml
index dc077cc7799..982df7b08d4 100644
--- a/guppy-summaries/Cargo.toml
+++ b/guppy-summaries/Cargo.toml
@@ -37,4 +37,4 @@ guppy-workspace-hack.workspace = true
 [dev-dependencies]
 indoc = "2.0.5"
 pretty_assertions = "1.4.0"
-serde_json = "1.0.117"
+serde_json = "1.0.133"
diff --git a/guppy/Cargo.toml b/guppy/Cargo.toml
index 219df0bf529..35e577163cf 100644
--- a/guppy/Cargo.toml
+++ b/guppy/Cargo.toml
@@ -47,7 +47,7 @@ proptest-derive = { version = "0.5.0", optional = true }
 rayon = { version = "1.10.0", optional = true }
 semver = "1.0.23"
 serde = { version = "1.0.204", features = ["derive"] }
-serde_json = "1.0.117"
+serde_json = "1.0.133"
 smallvec = "1.13.2"
 static_assertions = "1.1.0"
 target-spec = { version = "3.2.2", path = "../target-spec" }
diff --git a/target-spec/Cargo.toml b/target-spec/Cargo.toml
index 5d5f9dddf65..ecbbe7f8010 100644
--- a/target-spec/Cargo.toml
+++ b/target-spec/Cargo.toml
@@ -23,7 +23,7 @@ maintenance = { status = "actively-developed" }
 cfg-expr = { version = "0.17.0", features = ["targets"] }
 proptest = { version = "1.5.0", optional = true }
 serde = { version = "1.0.204", optional = true, features = ["derive"] }
-serde_json = { version = "1.0.117", optional = true }
+serde_json = { version = "1.0.133", optional = true }
 target-lexicon = { version = "0.12.16", features = ["std"] }
 unicode-ident = "1.0.12"
 guppy-workspace-hack.workspace = true