diff --git a/Cargo.toml b/Cargo.toml
index 325fc79..25b0599 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,5 +4,4 @@ members = [
     "encryption-demo",
     "encryption-demo-methods",
     "encryption-demo-methods/guest/chacha20",
-    "encryption-demo-methods/guest/xchacha20",
 ]
diff --git a/encryption-demo-methods/Cargo.toml b/encryption-demo-methods/Cargo.toml
index bccc044..508c77f 100644
--- a/encryption-demo-methods/Cargo.toml
+++ b/encryption-demo-methods/Cargo.toml
@@ -6,10 +6,10 @@ publish = false
 build = "build.rs"
 
 [dependencies]
-risc0-zkvm = { version = "2.3.1", default-features = false }
+risc0-zkvm = { version = "2.2", default-features = false }
 
 [build-dependencies]
-risc0-build = { version = "2.3.1", default-features = false }
+risc0-build = { version = "2.2", default-features = false }
 
 [package.metadata.risc0]
 methods = ["guest/chacha20", "guest/xchacha20"]
diff --git a/encryption-demo-methods/guest/chacha20/Cargo.toml b/encryption-demo-methods/guest/chacha20/Cargo.toml
index fdf0bfb..0d21f6a 100644
--- a/encryption-demo-methods/guest/chacha20/Cargo.toml
+++ b/encryption-demo-methods/guest/chacha20/Cargo.toml
@@ -11,7 +11,6 @@ crate-type = ["staticlib"]
 chacha20 = { version = "0.9", default-features = false }
 cipher   = { version = "0.4", default-features = false }
 
-risc0-zkvm-guest = "2.3.1"
 
 [features]
 default = ["alloc"]    # pull in alloc inside guest
diff --git a/encryption-demo-methods/guest/xchacha20/Cargo.toml b/encryption-demo-methods/guest/xchacha20/Cargo.toml
deleted file mode 100644
index efd6e1e..0000000
--- a/encryption-demo-methods/guest/xchacha20/Cargo.toml
+++ /dev/null
@@ -1,19 +0,0 @@
-[package]
-name = "xchacha20"
-version = "0.1.0"
-edition = "2021"
-publish = false
-# Ensure staticlib for RISC-V
-crate-type = ["staticlib"]
-
-[dependencies]
-# no_std stream cipher
-xchacha20 = { version = "0.9", default-features = false }
-cipher   = { version = "0.4", default-features = false }
-
-risc0-zkvm-guest = "2.3.1"
-
-[features]
-default = ["alloc"]    # pull in alloc inside guest
-alloc = []
-
diff --git a/encryption-demo-methods/guest/xchacha20/src/main.rs b/encryption-demo-methods/guest/xchacha20/src/main.rs
deleted file mode 100644
index e76ec7a..0000000
--- a/encryption-demo-methods/guest/xchacha20/src/main.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-#![no_std]
-#![no_main]
-
-use chacha20::cipher::{KeyIvInit, StreamCipher};
-use chacha20::XChaCha20;
-use risc0_zkvm::guest::env;
-risc0_zkvm_guest::entry!(main);
-
-pub fn main() {
-    let key: [u8; 32] = env::read();
-    let nonce: [u8; 24] = env::read();
-    let len: u32 = env::read();
-    let mut plaintext = vec![0u8; len as usize];
-    env::read_slice(&mut plaintext).unwrap();
-
-    let mut cipher = XChaCha20::new(&key.into(), &nonce.into());
-    cipher.apply_keystream(&mut plaintext);
-
-    env::commit_slice(&plaintext);
-}
-
diff --git a/encryption-demo/Cargo.toml b/encryption-demo/Cargo.toml
index bd556c7..3461c8f 100644
--- a/encryption-demo/Cargo.toml
+++ b/encryption-demo/Cargo.toml
@@ -5,12 +5,12 @@ edition = "2021"
 publish = false
 
 [dependencies]
-risc0-zkvm = "2.3.1"
+risc0-zkvm = "2.2"
 rand = { version = "0.8", features = ["std"]}
 hex = "0.4"
 
 encryption-demo-methods = { path = "../encryption-demo-methods" }
-risc0-build = "2.3.1"
+risc0-build = "2.2"
 
 [[bin]]
 name = "encrypt-demo"