diff --git a/apps/fortuna/Cargo.lock b/apps/fortuna/Cargo.lock
index f5e59989c4..9c9e496696 100644
--- a/apps/fortuna/Cargo.lock
+++ b/apps/fortuna/Cargo.lock
@@ -1554,7 +1554,7 @@ dependencies = [
 
 [[package]]
 name = "fortuna"
-version = "7.5.0"
+version = "7.5.1"
 dependencies = [
  "anyhow",
  "axum",
diff --git a/apps/fortuna/Cargo.toml b/apps/fortuna/Cargo.toml
index 4e001fdb6f..1fa6a5f565 100644
--- a/apps/fortuna/Cargo.toml
+++ b/apps/fortuna/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fortuna"
-version = "7.5.0"
+version = "7.5.1"
 edition = "2021"
 
 [lib]
diff --git a/apps/fortuna/src/api/revelation.rs b/apps/fortuna/src/api/revelation.rs
index cd5be97c57..3dcaccbb77 100644
--- a/apps/fortuna/src/api/revelation.rs
+++ b/apps/fortuna/src/api/revelation.rs
@@ -125,7 +125,7 @@ pub struct RevelationPathParams {
 #[into_params(parameter_in=Query)]
 pub struct RevelationQueryParams {
     pub encoding: Option<BinaryEncoding>,
-    #[param(value_type = u64)]
+    #[param(value_type = Option<u64>)]
     pub block_number: Option<BlockNumber>,
 }