diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..06cb150
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,4 @@
+
+[target.wasm32-unknown-unknown]
+runner = "wasm-server-runner"
+rustflags = ["--cfg", "getrandom_backend=\"wasm_js\""]
diff --git a/Cargo.toml b/Cargo.toml
index ec3e807..9e49dc7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,4 +9,9 @@ rand = "0.9.2"
 rand_chacha = "0.9.0"
 
 [features]
-dynamic_linking = ["bevy/dynamic_linking"]
\ No newline at end of file
+dynamic_linking = ["bevy/dynamic_linking"]
+
+# For WASM builds, we need to use the browser's RNG back-end.
+# This also requires the extra rustflags in `.cargo/config.toml`
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+getrandom = { version = "0.3.3", features = ["wasm_js"] }