diff --git a/Cargo.lock b/Cargo.lock
index 01be4a62aa1..fa24409dec9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1347,6 +1347,12 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
+[[package]]
+name = "fixedbitset"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"
+
 [[package]]
 name = "fixture-manager"
 version = "0.1.0"
@@ -2265,7 +2271,7 @@ dependencies = [
  "cargo_metadata",
  "cfg-if",
  "debug-ignore",
- "fixedbitset",
+ "fixedbitset 0.5.7",
  "fixtures",
  "guppy-summaries",
  "guppy-workspace-hack",
@@ -3220,7 +3226,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4c5cc86750666a3ed20bdaf5ca2a0344f9c67674cae0515bec2da16fbaa47db"
 dependencies = [
- "fixedbitset",
+ "fixedbitset 0.4.2",
  "indexmap 2.7.0",
 ]
 
diff --git a/guppy/Cargo.toml b/guppy/Cargo.toml
index 1e27d26b125..5502b332cff 100644
--- a/guppy/Cargo.toml
+++ b/guppy/Cargo.toml
@@ -35,7 +35,7 @@ cargo_metadata = "0.19.1"
 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 = "0.5.7", default-features = false }
 nested = "0.1.1"
 indexmap = "2.7.0"
 itertools = "0.13.0"