diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c7ffe6..ad4cc52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# v5.1.2 (27/02/2026)
+* Fix sub-command parameters having the `parameters` field incorrectly serialized (Filip Hoffmann)
+
 # v5.1.1 (20/02/2026)
 * Fix bugs related to reconnects failing (Copilot/Filip Hoffmann)
 
diff --git a/gleam.toml b/gleam.toml
index da681e4..62cb3eb 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -1,5 +1,5 @@
 name = "grom"
-version = "5.1.1"
+version = "5.1.2"
 description = "A Gleamy library for the Discord API 🌟"
 licenses = ["MIT"]
 repository = { type = "github", user = "folospior", repo = "grom" }
diff --git a/src/grom.gleam b/src/grom.gleam
index e1d6141..134ed88 100644
--- a/src/grom.gleam
+++ b/src/grom.gleam
@@ -27,5 +27,5 @@ pub type Error {
 // FUNCTIONS -------------------------------------------------------------------
 
 pub fn version() -> String {
-  "v5.1.1"
+  "v5.1.2"
 }
diff --git a/src/grom/command.gleam b/src/grom/command.gleam
index 33ce2f1..4f24965 100644
--- a/src/grom/command.gleam
+++ b/src/grom/command.gleam
@@ -1291,7 +1291,7 @@ pub fn parameter_sub_command_to_json(parameter: ParameterSubCommand) -> Json {
 
   let parameters = case parameter.parameters {
     Some(parameters) -> [
-      #("parameters", json.array(parameters, parameter_to_json)),
+      #("options", json.array(parameters, parameter_to_json)),
     ]
     None -> []
   }
@@ -1339,7 +1339,7 @@ pub fn parameter_sub_command_group_to_json(
 
   let parameters = case parameter.parameters {
     Some(parameters) -> [
-      #("parameters", json.array(parameters, parameter_to_json)),
+      #("options", json.array(parameters, parameter_to_json)),
     ]
     None -> []
   }
@@ -2142,7 +2142,7 @@ pub fn modify_slash_command_for_guild_to_json(
 
   let parameters = case modify.parameters {
     Some(parameters) -> [
-      #("parameters", json.array(parameters, parameter_to_json)),
+      #("options", json.array(parameters, parameter_to_json)),
     ]
     None -> []
   }