diff --git a/crates/libtest-json/src/event.rs b/crates/libtest-json/src/event.rs
index 7913735..8e749b2 100644
--- a/crates/libtest-json/src/event.rs
+++ b/crates/libtest-json/src/event.rs
@@ -3,6 +3,7 @@
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
 #[cfg_attr(feature = "serde", serde(tag = "event"))]
+#[non_exhaustive]
 pub enum Event {
     DiscoverStart(DiscoverStart),
     DiscoverCase(DiscoverCase),
@@ -82,6 +83,7 @@ impl From<RunComplete> for Event {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct DiscoverStart {
     #[cfg_attr(
         feature = "serde",
@@ -122,6 +124,7 @@ impl DiscoverStart {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct DiscoverCase {
     /// An identifier that is unique across the entire run
     pub name: String,
@@ -191,6 +194,7 @@ impl DiscoverCase {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct DiscoverComplete {
     #[cfg_attr(
         feature = "serde",
@@ -228,6 +232,7 @@ impl DiscoverComplete {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct RunStart {
     #[cfg_attr(
         feature = "serde",
@@ -265,6 +270,7 @@ impl RunStart {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct CaseStart {
     /// An identifier that is unique across the entire run
     pub name: String,
@@ -309,6 +315,7 @@ impl CaseStart {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct CaseMessage {
     /// An identifier that is unique across the entire run
     pub name: String,
@@ -371,6 +378,7 @@ impl CaseMessage {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct CaseComplete {
     /// An identifier that is unique across the entire run
     pub name: String,
@@ -415,6 +423,7 @@ impl CaseComplete {
 #[cfg_attr(feature = "unstable-schema", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
+#[non_exhaustive]
 pub struct RunComplete {
     #[cfg_attr(
         feature = "serde",
diff --git a/crates/libtest2-harness/src/notify/pretty.rs b/crates/libtest2-harness/src/notify/pretty.rs
index 515397b..6bbef79 100644
--- a/crates/libtest2-harness/src/notify/pretty.rs
+++ b/crates/libtest2-harness/src/notify/pretty.rs
@@ -72,6 +72,7 @@ impl<W: std::io::Write> super::Notifier for PrettyRunNotifier<W> {
             Event::RunComplete(_) => {
                 self.summary.write_complete(&mut self.writer)?;
             }
+            _ => {}
         }
         Ok(())
     }
diff --git a/crates/libtest2-harness/src/notify/summary.rs b/crates/libtest2-harness/src/notify/summary.rs
index 4f0b956..e2c1caf 100644
--- a/crates/libtest2-harness/src/notify/summary.rs
+++ b/crates/libtest2-harness/src/notify/summary.rs
@@ -137,6 +137,7 @@ impl super::Notifier for Summary {
             Event::RunComplete(inner) => {
                 self.elapsed_s = inner.elapsed_s;
             }
+            _ => {}
         }
         Ok(())
     }
diff --git a/crates/libtest2-harness/src/notify/terse.rs b/crates/libtest2-harness/src/notify/terse.rs
index ac212bb..92fe8b8 100644
--- a/crates/libtest2-harness/src/notify/terse.rs
+++ b/crates/libtest2-harness/src/notify/terse.rs
@@ -38,6 +38,7 @@ impl<W: std::io::Write> super::Notifier for TerseListNotifier<W> {
             Event::CaseMessage(_) => {}
             Event::CaseComplete(_) => {}
             Event::RunComplete(_) => {}
+            _ => {}
         }
         Ok(())
     }
@@ -83,6 +84,7 @@ impl<W: std::io::Write> super::Notifier for TerseRunNotifier<W> {
             Event::RunComplete(_) => {
                 self.summary.write_complete(&mut self.writer)?;
             }
+            _ => {}
         }
         Ok(())
     }