diff --git a/Cargo.lock b/Cargo.lock
index e7e53f7..aa16549 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -471,11 +471,13 @@ checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 
 [[package]]
 name = "risc0-bigint2"
-version = "1.2.0-alpha.1"
-source = "git+https://github.com/risc0/risc0?rev=8fc8437633f08a66e0fbacce947f41d01b074774#8fc8437633f08a66e0fbacce947f41d01b074774"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f4c185a3bfaee681eed5bfac1440128184bf0b6544c345fb4d7bd4317c909fb"
 dependencies = [
  "include_bytes_aligned",
  "num-bigint-dig",
+ "stability",
 ]
 
 [[package]]
@@ -646,6 +648,16 @@ dependencies = [
  "der",
 ]
 
+[[package]]
+name = "stability"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d904e7009df136af5297832a3ace3370cd14ff1546a232f4f185036c2736fcac"
+dependencies = [
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "subtle"
 version = "2.5.0"
diff --git a/Cargo.toml b/Cargo.toml
index 67ed6d2..d5794e0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ sha2 = { version = "0.10.6", optional = true, default-features = false, features
 serde = { version = "1.0.184", optional = true, default-features = false, features = ["derive"] }
 
 [target.'cfg(target_os = "zkvm")'.dependencies]
-risc0-bigint2 = { git = "https://github.com/risc0/risc0", rev = "8fc8437633f08a66e0fbacce947f41d01b074774", default-features = false, features = ["num-bigint-dig"] }
+risc0-bigint2 = { version = "1.2.0", default-features = false, features = ["num-bigint-dig", "unstable"] }
 
 [dev-dependencies]
 base64ct = { version = "1", features = ["alloc"] }
diff --git a/src/algorithms/rsa.rs b/src/algorithms/rsa.rs
index e230522..a2c71d7 100644
--- a/src/algorithms/rsa.rs
+++ b/src/algorithms/rsa.rs
@@ -21,9 +21,14 @@ use crate::traits::{PrivateKeyParts, PublicKeyParts};
 pub fn rsa_encrypt<K: PublicKeyParts>(key: &K, m: &BigUint) -> Result<BigUint> {
     #[cfg(target_os = "zkvm")]
     {
+        use risc0_bigint2::ToBigInt2Buffer;
         // If we're in the RISC Zero zkVM, try to use an accelerated version.
         if *key.e() == BigUint::new(vec![65537]) {
-            return Ok(risc0_bigint2::rsa::modpow_65537(m, key.n()));
+            let m = m.to_u32_array();
+            let n = key.n().to_u32_array();
+            let mut result = [0u32; 128];
+            risc0_bigint2::rsa::modpow_65537(&m, &n, &mut result);
+            return Ok(BigUint::from_u32_array(result));
         }
         // Fall through when the exponent does not match the accelerator
     }