diff --git a/lib/src/executor/host.rs b/lib/src/executor/host.rs
index f2d3c66e9d..7d147b774c 100644
--- a/lib/src/executor/host.rs
+++ b/lib/src/executor/host.rs
@@ -1835,7 +1835,15 @@ impl ReadyToRun {
                 self.inner
                     .alloc_write_and_return_pointer(host_fn.name(), iter::once(&out))
             }
-            HostFunction::ext_hashing_keccak_512_version_1 => host_fn_not_implemented!(),
+            HostFunction::ext_hashing_keccak_512_version_1 => {
+                let mut keccak = tiny_keccak::Keccak::v512();
+                keccak.update(expect_pointer_size!(0).as_ref());
+                let mut out = [0u8; 64];
+                keccak.finalize(&mut out);
+
+                self.inner
+                    .alloc_write_and_return_pointer(host_fn.name(), iter::once(&out))
+            }
             HostFunction::ext_hashing_sha2_256_version_1 => {
                 let mut hasher = sha2::Sha256::new();
                 hasher.update(expect_pointer_size!(0));
diff --git a/wasm-node/CHANGELOG.md b/wasm-node/CHANGELOG.md
index d65197260e..2c24a17df7 100644
--- a/wasm-node/CHANGELOG.md
+++ b/wasm-node/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## Added
+
+- Add support for the `ext_hashing_keccak_512_version_1` host function. ([#231](https://github.com/smol-dot/smoldot/pull/231))
+
 ## Fixed
 
 - Fix panic when the input data of a Wasm function call is larger than a Wasm page. ([#218](https://github.com/smol-dot/smoldot/pull/218))