diff --git a/Cargo.toml b/Cargo.toml
index 63e8d55d..47a5c71f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,6 +37,10 @@ halo2curves = { version="0.1.0", features = [ "derive_serde" ] }
 [target.'cfg(any(target_arch = "x86_64", target_arch = "aarch64"))'.dependencies]
 pasta-msm = { version = "0.1.4" }
 
+[target.wasm32-unknown-unknown.dependencies]
+# see https://github.com/rust-random/rand/pull/948
+getrandom = { version = "0.2.0", default-features = false, features = ["js"]}
+
 [dev-dependencies]
 criterion = { version = "0.4", features = ["html_reports"] }
 rand = "0.8.4"