diff --git a/Cargo.lock b/Cargo.lock
index 4b086443dfca..2263553ff352 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1209,6 +1209,12 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
+[[package]]
+name = "fixedbitset"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "104fab1343cee1c44ff0ebadb6a1b669ef8c429356dc958ce00cec96e4a433ca"
+
 [[package]]
 name = "fixture-manager"
 version = "0.1.0"
@@ -2098,7 +2104,7 @@ dependencies = [
  "cargo_metadata",
  "cfg-if",
  "debug-ignore",
- "fixedbitset",
+ "fixedbitset 0.5.1",
  "fixtures",
  "guppy-summaries",
  "guppy-workspace-hack",
@@ -2954,7 +2960,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1d3afd2628e69da2be385eb6f2fd57c8ac7977ceeff6dc166ff1657b0e386a9"
 dependencies = [
- "fixedbitset",
+ "fixedbitset 0.4.2",
  "indexmap 2.2.5",
 ]
 
diff --git a/guppy/Cargo.toml b/guppy/Cargo.toml
index 8ed7ea6b6e84..f97d9cf94ead 100644
--- a/guppy/Cargo.toml
+++ b/guppy/Cargo.toml
@@ -35,7 +35,7 @@ cargo_metadata = "0.18.1"
 cfg-if = "1.0.0"
 debug-ignore = "1.0.5"
 guppy-summaries = { version = "0.7.1", path = "../guppy-summaries", optional = true }
-fixedbitset = { version = "0.4.2", default-features = false }
+fixedbitset = { version = "0.5.1", default-features = false }
 nested = "0.1.1"
 indexmap = "2.2.5"
 itertools = "0.12.1"