diff --git a/Cargo.lock b/Cargo.lock
index 8af2775..a1bd106 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -38,7 +38,7 @@ dependencies = [
  "cpufeatures",
  "hex-literal",
  "rand_chacha",
- "rand_core 0.9.0-alpha.2",
+ "rand_core 0.9.0-beta.1",
  "serde",
  "serde_json",
  "zeroize",
@@ -144,7 +144,7 @@ version = "0.2.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
 dependencies = [
- "zerocopy",
+ "zerocopy 0.7.35",
 ]
 
 [[package]]
@@ -194,11 +194,11 @@ dependencies = [
 
 [[package]]
 name = "rand_core"
-version = "0.9.0-alpha.2"
+version = "0.9.0-beta.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4e93f5a5e3c528cda9acb0928c31b2ba868c551cc46e67b778075e34aab9906"
+checksum = "a98fa0b8309344136abe6244130311e76997e546f76fae8054422a7539b43df7"
 dependencies = [
- "zerocopy",
+ "zerocopy 0.8.11",
 ]
 
 [[package]]
@@ -292,7 +292,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
 dependencies = [
  "byteorder",
- "zerocopy-derive",
+ "zerocopy-derive 0.7.35",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cce3b5629d87654b53a49002acc2ce64aa5aa7255f5c718374a37ac7fd98c218"
+dependencies = [
+ "zerocopy-derive 0.8.11",
 ]
 
 [[package]]
@@ -306,6 +315,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74a82c26c3986af2623ec9eb890ff4aa19c006e30a1133dc9bd1830ec1612e20"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "zeroize"
 version = "1.8.1"
diff --git a/chacha20/Cargo.toml b/chacha20/Cargo.toml
index a6aae93..5250055 100644
--- a/chacha20/Cargo.toml
+++ b/chacha20/Cargo.toml
@@ -21,7 +21,7 @@ categories = ["cryptography", "no-std"]
 [dependencies]
 cfg-if = "1"
 cipher = { version = "=0.5.0-pre.7", optional = true }
-rand_core = { version = "0.9.0-alpha.2", optional = true, default-features = false }
+rand_core = { version = "0.9.0-beta.1", optional = true, default-features = false }
 serde = { version = "1.0", features = ["derive"], optional = true }
 
 # `zeroize` is an explicit dependency because this crate may be used without the `cipher` crate