diff --git a/Cargo.lock b/Cargo.lock
index c0ed16e5..16efd57d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -175,7 +175,7 @@ version = "0.2.0"
 dependencies = [
  "ordered-float",
  "rand",
- "rand_chacha",
+ "rand_chacha 0.10.0",
  "rayon",
 ]
 
@@ -298,8 +298,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
 dependencies = [
  "libc",
- "rand_chacha",
- "rand_core",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -309,7 +309,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e6af7f3e25ded52c41df4e0b1af2d047e45896c2f3281792ed68a1c243daedb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.10.1",
 ]
 
 [[package]]
@@ -321,6 +331,12 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69"
+
 [[package]]
 name = "rawpointer"
 version = "0.2.1"
diff --git a/Cargo.toml b/Cargo.toml
index 91275a62..63598426 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,7 +35,7 @@ ordered-float = "5"
 [dev-dependencies]
 # Test/bench corpora are seeded with these; not needed by the library.
 rand = "0.8"
-rand_chacha = "0.3"
+rand_chacha = "0.10"
 
 [features]
 # SIMD is always compiled, never feature-gated: x86_64 dispatches AVX-512/AVX2 at