diff --git a/examples/configmapgen_controller.rs b/examples/configmapgen_controller.rs
index 499ef5e09..6fa3efc06 100644
--- a/examples/configmapgen_controller.rs
+++ b/examples/configmapgen_controller.rs
@@ -1,3 +1,6 @@
+// Nightly clippy (0.1.64) considers Drop a side effect, see https://github.com/rust-lang/rust-clippy/issues/9608
+#![allow(clippy::unnecessary_lazy_evaluations)]
+
 use anyhow::Result;
 use futures::StreamExt;
 use k8s_openapi::api::core::v1::ConfigMap;
@@ -50,14 +53,14 @@ async fn reconcile(generator: Arc<ConfigMapGenerator>, ctx: Arc<Data>) -> Result
             .metadata
             .namespace
             .as_ref()
-            .ok_or(Error::MissingObjectKey(".metadata.namespace"))?,
+            .ok_or_else(|| Error::MissingObjectKey(".metadata.namespace"))?,
     );
     cm_api
         .patch(
             cm.metadata
                 .name
                 .as_ref()
-                .ok_or(Error::MissingObjectKey(".metadata.name"))?,
+                .ok_or_else(|| Error::MissingObjectKey(".metadata.name"))?,
             &PatchParams::apply("configmapgenerator.kube-rt.nullable.se"),
             &Patch::Apply(&cm),
         )
diff --git a/kube-client/src/api/portforward.rs b/kube-client/src/api/portforward.rs
index 4a009b7be..95cdec531 100644
--- a/kube-client/src/api/portforward.rs
+++ b/kube-client/src/api/portforward.rs
@@ -278,7 +278,7 @@ where
         match msg {
             Message::FromPod(ch, mut bytes) => {
                 let ch = ch as usize;
-                let channel = chan_state.get_mut(ch).ok_or(Error::InvalidChannel(ch))?;
+                let channel = chan_state.get_mut(ch).ok_or_else(|| Error::InvalidChannel(ch))?;
 
                 let port_index = ch / 2;
                 // Initialization
@@ -327,7 +327,7 @@ where
             }
             Message::ToPodClose(ch) => {
                 let ch = ch as usize;
-                let channel = chan_state.get_mut(ch).ok_or(Error::InvalidChannel(ch))?;
+                let channel = chan_state.get_mut(ch).ok_or_else(|| Error::InvalidChannel(ch))?;
                 let port_index = ch / 2;
 
                 if !channel.shutdown {
diff --git a/kube-client/src/config/file_config.rs b/kube-client/src/config/file_config.rs
index 0975950ac..bdfec434b 100644
--- a/kube-client/src/config/file_config.rs
+++ b/kube-client/src/config/file_config.rs
@@ -480,7 +480,7 @@ fn load_from_base64_or_file<P: AsRef<Path>>(
     let data = value
         .map(load_from_base64)
         .or_else(|| file.as_ref().map(load_from_file))
-        .unwrap_or(Err(LoadDataError::NoBase64DataOrFile))?;
+        .unwrap_or_else(|| Err(LoadDataError::NoBase64DataOrFile))?;
     Ok(ensure_trailing_newline(data))
 }
 
diff --git a/kube-client/src/lib.rs b/kube-client/src/lib.rs
index ff80e36bb..9fcccccd0 100644
--- a/kube-client/src/lib.rs
+++ b/kube-client/src/lib.rs
@@ -63,6 +63,8 @@
 #![cfg_attr(docsrs, feature(doc_cfg))]
 #![deny(missing_docs)]
 #![forbid(unsafe_code)]
+// Nightly clippy (0.1.64) considers Drop a side effect, see https://github.com/rust-lang/rust-clippy/issues/9608
+#![allow(clippy::unnecessary_lazy_evaluations)]
 
 macro_rules! cfg_client {
     ($($item:item)*) => {
diff --git a/kube-core/src/schema.rs b/kube-core/src/schema.rs
index 1b1675506..308ee3573 100644
--- a/kube-core/src/schema.rs
+++ b/kube-core/src/schema.rs
@@ -72,7 +72,7 @@ fn hoist_subschema_properties(
     common_obj: &mut Option<Box<ObjectValidation>>,
     instance_type: &mut Option<SingleOrVec<InstanceType>>,
 ) {
-    let common_obj = common_obj.get_or_insert_with(|| Box::new(ObjectValidation::default()));
+    let common_obj = common_obj.get_or_insert_with(Box::<ObjectValidation>::default);
 
     for variant in subschemas {
         if let Schema::Object(SchemaObject {
@@ -90,7 +90,7 @@ fn hoist_subschema_properties(
                     {
                         let metadata = variant_object
                             .metadata
-                            .get_or_insert_with(|| Box::new(Metadata::default()));
+                            .get_or_insert_with(Box::<Metadata>::default);
                         metadata.description = Some(description);
                     }
                 }