diff --git a/Cargo.lock b/Cargo.lock
index 55188317f21..08e5ee6769e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3201,9 +3201,9 @@ dependencies = [
 
 [[package]]
 name = "proptest"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31b476131c3c86cb68032fdc5cb6d5a1045e3e42d96b69fa599fd77701e1f5bf"
+checksum = "b4c2511913b88df1637da85cc8d96ec8e43a3f8bb8ccb71ee1ac240d6f3df58d"
 dependencies = [
  "bit-set",
  "bit-vec",
diff --git a/guppy-cmdlib/Cargo.toml b/guppy-cmdlib/Cargo.toml
index 78fd150acbc..cfd59c7cbb8 100644
--- a/guppy-cmdlib/Cargo.toml
+++ b/guppy-cmdlib/Cargo.toml
@@ -13,7 +13,7 @@ publish = false
 clap = { version = "3.2.25", features = ["derive"] }
 color-eyre = { version = "0.6.3", default-features = false }
 guppy = { path = "../guppy" }
-proptest = { version = "1.4.0", optional = true }
+proptest = { version = "1.5.0", optional = true }
 guppy-workspace-hack.workspace = true
 
 [features]
diff --git a/guppy/Cargo.toml b/guppy/Cargo.toml
index 8f45bec6f8d..2f3a2d45e92 100644
--- a/guppy/Cargo.toml
+++ b/guppy/Cargo.toml
@@ -42,7 +42,7 @@ itertools = "0.13.0"
 once_cell = "1.19.0"
 pathdiff = { version = "0.2.1", features = ["camino"] }
 petgraph = { version = "0.6.5", default-features = false }
-proptest = { version = "1.4.0", optional = true }
+proptest = { version = "1.5.0", optional = true }
 proptest-derive = { version = "0.4.0", optional = true }
 rayon = { version = "1.10.0", optional = true }
 semver = "1.0.23"
diff --git a/internal-tools/benchmarks/Cargo.toml b/internal-tools/benchmarks/Cargo.toml
index 13b8203d508..3c48fe58ccc 100644
--- a/internal-tools/benchmarks/Cargo.toml
+++ b/internal-tools/benchmarks/Cargo.toml
@@ -7,7 +7,7 @@ publish = false  # this is a private crate
 
 [dependencies]
 guppy = { path = "../../guppy", features = ["proptest1"] }
-proptest = "1.4.0"
+proptest = "1.5.0"
 proptest-ext = { path = "../proptest-ext" }
 guppy-workspace-hack.workspace = true
 
diff --git a/internal-tools/cargo-compare/Cargo.toml b/internal-tools/cargo-compare/Cargo.toml
index 1cd6436ea9a..5d09e6f05fe 100644
--- a/internal-tools/cargo-compare/Cargo.toml
+++ b/internal-tools/cargo-compare/Cargo.toml
@@ -19,4 +19,4 @@ guppy-cmdlib = { path = "../../guppy-cmdlib", features = ["proptest1"] }
 tempfile = "3.10.1"
 once_cell = "1.19.0"
 pathdiff = "0.2.1"
-proptest = "1.4.0"
+proptest = "1.5.0"
diff --git a/internal-tools/fixture-manager/Cargo.toml b/internal-tools/fixture-manager/Cargo.toml
index 399b8d9faf5..5488197f32e 100644
--- a/internal-tools/fixture-manager/Cargo.toml
+++ b/internal-tools/fixture-manager/Cargo.toml
@@ -16,7 +16,7 @@ guppy-cmdlib = { path = "../../guppy-cmdlib", features = ["proptest1"] }
 fixtures = { path = "../../fixtures" }
 hakari = { path = "../../tools/hakari", features = ["cli-support", "proptest1"] }
 once_cell = "1.19.0"
-proptest = "1.4.0"
+proptest = "1.5.0"
 proptest-ext = { path = "../proptest-ext" }
 structopt = "0.3.26"
 guppy-workspace-hack.workspace = true
diff --git a/internal-tools/proptest-ext/Cargo.toml b/internal-tools/proptest-ext/Cargo.toml
index fddb2625aa0..8588aa668a2 100644
--- a/internal-tools/proptest-ext/Cargo.toml
+++ b/internal-tools/proptest-ext/Cargo.toml
@@ -8,6 +8,6 @@ publish = false  # this is a private crate
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-proptest = "1.4.0"
+proptest = "1.5.0"
 twox-hash = { version = "1.6.3", default-features = false }
 guppy-workspace-hack.workspace = true
diff --git a/target-spec/Cargo.toml b/target-spec/Cargo.toml
index 456fe971212..25b197c7036 100644
--- a/target-spec/Cargo.toml
+++ b/target-spec/Cargo.toml
@@ -21,7 +21,7 @@ maintenance = { status = "actively-developed" }
 
 [dependencies]
 cfg-expr = { version = "0.16.0", features = ["targets"] }
-proptest = { version = "1.4.0", optional = true }
+proptest = { version = "1.5.0", optional = true }
 serde = { version = "1.0.204", optional = true, features = ["derive"] }
 serde_json = { version = "1.0.117", optional = true }
 target-lexicon = { version = "0.12.16", features = ["std"] }
diff --git a/tools/hakari/Cargo.toml b/tools/hakari/Cargo.toml
index a433e28ba36..82cdbef41cb 100644
--- a/tools/hakari/Cargo.toml
+++ b/tools/hakari/Cargo.toml
@@ -35,7 +35,7 @@ indenter = "0.3.3"
 itertools = "0.13.0"
 owo-colors = { version = "3.5.0", optional = true }
 pathdiff = { version = "0.2.1", features = ["camino"] }
-proptest = { version = "1.4.0", optional = true }
+proptest = { version = "1.5.0", optional = true }
 proptest-derive = { version = "0.4.0", optional = true }
 rayon = "1.10.0"
 serde = { version = "1.0.204", features = ["derive"], optional = true }