diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 215b616b63..e9e1d86b35 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -3,6 +3,8 @@ on: [push, pull_request]
 jobs:
   native:
     runs-on: ${{ matrix.os }}
+    env:
+      RUSTFLAGS: --deny warnings
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
diff --git a/examples/lazy/src/main.rs b/examples/lazy/src/main.rs
index 9bf17c563a..0156059842 100644
--- a/examples/lazy/src/main.rs
+++ b/examples/lazy/src/main.rs
@@ -46,7 +46,7 @@ enum Color {
 }
 
 impl Color {
-    const ALL: &[Color] = &[
+    const ALL: &'static [Color] = &[
         Color::Black,
         Color::Red,
         Color::Orange,
diff --git a/examples/modal/src/main.rs b/examples/modal/src/main.rs
index b0e2c81b44..3b69f5e6ed 100644
--- a/examples/modal/src/main.rs
+++ b/examples/modal/src/main.rs
@@ -205,7 +205,8 @@ enum Plan {
 }
 
 impl Plan {
-    pub const ALL: &[Self] = &[Self::Basic, Self::Pro, Self::Enterprise];
+    pub const ALL: &'static [Self] =
+        &[Self::Basic, Self::Pro, Self::Enterprise];
 }
 
 impl fmt::Display for Plan {
diff --git a/examples/toast/src/main.rs b/examples/toast/src/main.rs
index 20c3dd4274..5b089e8ab0 100644
--- a/examples/toast/src/main.rs
+++ b/examples/toast/src/main.rs
@@ -210,7 +210,7 @@ mod toast {
     }
 
     impl Status {
-        pub const ALL: &[Self] =
+        pub const ALL: &'static [Self] =
             &[Self::Primary, Self::Secondary, Self::Success, Self::Danger];
     }
 
diff --git a/highlighter/src/lib.rs b/highlighter/src/lib.rs
index 5630756eed..63f21fc003 100644
--- a/highlighter/src/lib.rs
+++ b/highlighter/src/lib.rs
@@ -168,7 +168,7 @@ pub enum Theme {
 }
 
 impl Theme {
-    pub const ALL: &[Self] = &[
+    pub const ALL: &'static [Self] = &[
         Self::SolarizedDark,
         Self::Base16Mocha,
         Self::Base16Ocean,