diff --git a/diesel/src/lib.rs b/diesel/src/lib.rs
index 4e743eb4..97c53ed8 100644
--- a/diesel/src/lib.rs
+++ b/diesel/src/lib.rs
@@ -131,7 +131,6 @@
 #![cfg_attr(feature = "unstable", feature(specialization, try_from))]
 // Built-in Lints
 #![deny(
-    warnings,
     missing_debug_implementations,
     missing_copy_implementations,
     missing_docs
diff --git a/diesel_cli/src/main.rs b/diesel_cli/src/main.rs
index 741ca003..cf93bb8f 100644
--- a/diesel_cli/src/main.rs
+++ b/diesel_cli/src/main.rs
@@ -1,5 +1,5 @@
 // Built-in Lints
-#![deny(warnings, missing_copy_implementations)]
+#![deny(missing_copy_implementations)]
 // Clippy lints
 #![allow(clippy::option_map_unwrap_or_else, clippy::option_map_unwrap_or)]
 #![warn(
diff --git a/diesel_cli/tests/tests.rs b/diesel_cli/tests/tests.rs
index 2edee846..c96917c4 100644
--- a/diesel_cli/tests/tests.rs
+++ b/diesel_cli/tests/tests.rs
@@ -1,5 +1,3 @@
-#![deny(warnings)]
-
 extern crate chrono;
 extern crate diesel;
 #[macro_use]
diff --git a/diesel_derives/src/lib.rs b/diesel_derives/src/lib.rs
index 2c43b2a3..44dcf3f9 100644
--- a/diesel_derives/src/lib.rs
+++ b/diesel_derives/src/lib.rs
@@ -1,6 +1,6 @@
 #![recursion_limit = "1024"]
 // Built-in Lints
-#![deny(warnings, missing_copy_implementations)]
+#![deny(missing_copy_implementations)]
 // Clippy lints
 #![allow(
     clippy::needless_pass_by_value,
diff --git a/diesel_derives/tests/tests.rs b/diesel_derives/tests/tests.rs
index 636fea66..f86f3dcc 100644
--- a/diesel_derives/tests/tests.rs
+++ b/diesel_derives/tests/tests.rs
@@ -1,5 +1,3 @@
-#![deny(warnings)]
-
 #[macro_use]
 extern crate cfg_if;
 #[macro_use]
diff --git a/diesel_migrations/migrations_internals/src/lib.rs b/diesel_migrations/migrations_internals/src/lib.rs
index 933e21a8..7c4d0222 100644
--- a/diesel_migrations/migrations_internals/src/lib.rs
+++ b/diesel_migrations/migrations_internals/src/lib.rs
@@ -1,5 +1,5 @@
 // Built-in Lints
-#![deny(warnings, missing_debug_implementations, missing_copy_implementations)]
+#![deny(missing_debug_implementations, missing_copy_implementations)]
 // Clippy lints
 #![allow(
     clippy::option_map_unwrap_or_else,
diff --git a/diesel_migrations/migrations_macros/src/lib.rs b/diesel_migrations/migrations_macros/src/lib.rs
index 0a83234e..2f509c04 100644
--- a/diesel_migrations/migrations_macros/src/lib.rs
+++ b/diesel_migrations/migrations_macros/src/lib.rs
@@ -1,5 +1,5 @@
 // Built-in Lints
-#![deny(warnings, missing_debug_implementations, missing_copy_implementations)]
+#![deny(missing_debug_implementations, missing_copy_implementations)]
 // Clippy lints
 #![allow(
     clippy::option_map_unwrap_or_else,
diff --git a/diesel_migrations/src/lib.rs b/diesel_migrations/src/lib.rs
index c85414e5..f025f237 100644
--- a/diesel_migrations/src/lib.rs
+++ b/diesel_migrations/src/lib.rs
@@ -1,5 +1,5 @@
 // Built-in Lints
-#![deny(warnings, missing_copy_implementations)]
+#![deny(missing_copy_implementations)]
 // Clippy lints
 #![allow(
     clippy::needless_pass_by_value,