diff --git a/src/auditwheel/audit.rs b/src/auditwheel/audit.rs
index 3b7871693..993cd0d63 100644
--- a/src/auditwheel/audit.rs
+++ b/src/auditwheel/audit.rs
@@ -353,7 +353,7 @@ pub fn auditwheel_rs(
     } else if let Some(policy) = highest_policy {
         Ok(policy)
     } else {
-        println!(
+        eprintln!(
             "⚠️  Warning: No compatible platform tag found, using the linux tag instead. \
             You won't be able to upload those wheels to PyPI."
         );
diff --git a/src/build_context.rs b/src/build_context.rs
index c50124073..0bfd52920 100644
--- a/src/build_context.rs
+++ b/src/build_context.rs
@@ -232,7 +232,7 @@ impl BuildContext {
                             InterpreterKind::PyPy => "PyPy".to_string(),
                         })
                         .collect();
-                    println!(
+                    eprintln!(
                         "⚠️ Warning: {} does not yet support abi3 so the build artifacts will be version-specific.",
                         interp_names.iter().join(", ")
                     );
@@ -321,7 +321,7 @@ impl BuildContext {
                 }
                 let new_rpath = new_rpaths.join(":");
                 if let Err(err) = patchelf::set_rpath(&artifact.path, &new_rpath) {
-                    println!(
+                    eprintln!(
                         "⚠️ Warning: Failed to set rpath for {}: {}",
                         artifact.path.display(),
                         err
diff --git a/src/build_options.rs b/src/build_options.rs
index fab0b4f44..c6836a1e7 100644
--- a/src/build_options.rs
+++ b/src/build_options.rs
@@ -920,7 +920,7 @@ pub fn find_bridge(cargo_metadata: &Metadata, bridge: Option<&str>) -> Result<Br
             let pyo3_node = deps[lib];
             if !pyo3_node.features.contains(&"extension-module".to_string()) {
                 let version = cargo_metadata[&pyo3_node.id].version.to_string();
-                println!(
+                eprintln!(
                     "⚠️  Warning: You're building a library without activating {}'s \
                      `extension-module` feature. \
                      See https://pyo3.rs/v{}/building_and_distribution.html#linking",
diff --git a/src/cargo_toml.rs b/src/cargo_toml.rs
index d7a698887..c3df43e16 100644
--- a/src/cargo_toml.rs
+++ b/src/cargo_toml.rs
@@ -80,7 +80,7 @@ impl CargoToml {
             }
         }
         if !removed.is_empty() {
-            println!(
+            eprintln!(
                 "⚠️  Warning: the following metadata fields in `package.metadata.maturin` section \
                 of Cargo.toml are removed since maturin 0.14.0: {}, \
                 please set them in pyproject.toml as PEP 621 specifies.",
diff --git a/src/compile.rs b/src/compile.rs
index 456249f08..1dd593613 100644
--- a/src/compile.rs
+++ b/src/compile.rs
@@ -422,7 +422,7 @@ fn compile_target(
                             && !artifact.features.contains(&"rustc-dep-of-std".to_string());
                         if should_warn {
                             // This is a spurious error I don't really understand
-                            println!(
+                            eprintln!(
                                 "⚠️  Warning: The package {} wasn't listed in `cargo metadata`",
                                 package_id
                             );
@@ -551,7 +551,7 @@ pub fn warn_missing_py_init(artifact: &Path, module_name: &str) -> Result<()> {
     }
 
     if !found {
-        println!(
+        eprintln!(
             "⚠️  Warning: Couldn't find the symbol `{}` in the native library. \
              Python will fail to import this module. \
              If you're using pyo3, check that `#[pymodule]` uses `{}` as module name",
diff --git a/src/main.rs b/src/main.rs
index f5b244bf2..086654d69 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -422,7 +422,7 @@ fn run() -> Result<()> {
         #[cfg(feature = "upload")]
         Opt::Upload { publish, files } => {
             if files.is_empty() {
-                println!("⚠️  Warning: No files given, exiting.");
+                eprintln!("⚠️  Warning: No files given, exiting.");
                 return Ok(());
             }
 
diff --git a/src/source_distribution.rs b/src/source_distribution.rs
index 090d5e615..b44c54997 100644
--- a/src/source_distribution.rs
+++ b/src/source_distribution.rs
@@ -515,7 +515,7 @@ pub fn source_distribution(
         };
         writer.add_file(root_dir.join(relative_cargo_lock), &cargo_lock_path)?;
     } else {
-        println!(
+        eprintln!(
             "⚠️  Warning: Cargo.lock is not found, it is recommended \
             to include it in the source distribution"
         );