diff --git a/netcdf/src/attribute.rs b/netcdf/src/attribute.rs
index 6bdc275..0cc5c5d 100644
--- a/netcdf/src/attribute.rs
+++ b/netcdf/src/attribute.rs
@@ -27,7 +27,7 @@ pub struct Attribute<'a> {
     pub(crate) _marker: PhantomData<&'a nc_type>,
 }
 
-impl<'a> std::fmt::Debug for Attribute<'a> {
+impl std::fmt::Debug for Attribute<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "name: {}", self.name())?;
         write!(f, "ncid: {}", self.ncid)?;
@@ -35,7 +35,7 @@ impl<'a> std::fmt::Debug for Attribute<'a> {
     }
 }
 
-impl<'a> Attribute<'a> {
+impl Attribute<'_> {
     /// Get the name of the attribute
     ///
     /// # Panics
@@ -398,7 +398,7 @@ pub(crate) struct AttributeIterator<'a> {
     _marker: PhantomData<&'a nc_type>,
 }
 
-impl<'a> AttributeIterator<'a> {
+impl AttributeIterator<'_> {
     pub(crate) fn new(ncid: nc_type, varid: Option<nc_type>) -> error::Result<Self> {
         let mut natts = 0;
         checked_with_lock(|| unsafe {
@@ -474,7 +474,7 @@ pub enum AttributeValue {
     Strs(Vec<String>),
 }
 
-impl<'a> Attribute<'a> {
+impl Attribute<'_> {
     #[allow(clippy::needless_pass_by_value)] // All values will be small
     #[allow(clippy::too_many_lines)]
     pub(crate) fn put(
diff --git a/netcdf/src/dimension.rs b/netcdf/src/dimension.rs
index 2b706ed..2d0ff2f 100644
--- a/netcdf/src/dimension.rs
+++ b/netcdf/src/dimension.rs
@@ -27,7 +27,7 @@ pub struct DimensionIdentifier {
 }
 
 #[allow(clippy::len_without_is_empty)]
-impl<'g> Dimension<'g> {
+impl Dimension<'_> {
     /// Get current length of this dimension
     pub fn len(&self) -> usize {
         if let Some(x) = self.len {
diff --git a/netcdf/src/extent.rs b/netcdf/src/extent.rs
index 05100c6..3029fa2 100644
--- a/netcdf/src/extent.rs
+++ b/netcdf/src/extent.rs
@@ -478,7 +478,7 @@ enum StartCountStrideIter<'a> {
     Extent(std::iter::Zip<std::slice::Iter<'a, Extent>, std::slice::Iter<'a, Dimension<'a>>>),
 }
 
-impl<'a> Iterator for StartCountStrideIter<'a> {
+impl Iterator for StartCountStrideIter<'_> {
     type Item = StartCountStrideIterItem;
     fn next(&mut self) -> Option<Self::Item> {
         match self {
diff --git a/netcdf/src/file.rs b/netcdf/src/file.rs
index caf24d7..75715e9 100644
--- a/netcdf/src/file.rs
+++ b/netcdf/src/file.rs
@@ -518,7 +518,7 @@ impl FileMut {
 pub struct FileMem<'buffer>(File, std::marker::PhantomData<&'buffer [u8]>);
 
 #[cfg(feature = "has-mmap")]
-impl<'a> std::ops::Deref for FileMem<'a> {
+impl std::ops::Deref for FileMem<'_> {
     type Target = File;
     fn deref(&self) -> &Self::Target {
         &self.0
diff --git a/netcdf/src/group.rs b/netcdf/src/group.rs
index 820cbe3..959c194 100644
--- a/netcdf/src/group.rs
+++ b/netcdf/src/group.rs
@@ -177,8 +177,6 @@ impl<'f> GroupMut<'f> {
         crate::types::add_type(self.ncid, typ, false)
     }
 
-    /// Add an opaque datatype, with `size` bytes
-
     /// Add an attribute to the group
     pub fn add_attribute<'a, T>(&'a mut self, name: &str, val: T) -> error::Result<Attribute<'a>>
     where
diff --git a/netcdf/src/variable.rs b/netcdf/src/variable.rs
index c87e83e..f0c1348 100644
--- a/netcdf/src/variable.rs
+++ b/netcdf/src/variable.rs
@@ -229,7 +229,7 @@ impl<'g> Variable<'g> {
         }
     }
 }
-impl<'g> VariableMut<'g> {
+impl VariableMut<'_> {
     /// Sets compression on the variable. Must be set before filling in data.
     ///
     /// `deflate_level` can take a value 0..=9, with 0 being no
@@ -289,7 +289,7 @@ impl<'g> VariableMut<'g> {
     }
 }
 
-impl<'g> VariableMut<'g> {
+impl VariableMut<'_> {
     /// Adds an attribute to the variable
     pub fn put_attribute<T>(&mut self, name: &str, val: T) -> error::Result<Attribute>
     where
@@ -299,7 +299,7 @@ impl<'g> VariableMut<'g> {
     }
 }
 
-impl<'g> Variable<'g> {
+impl Variable<'_> {
     fn get_values_mono<T: NcTypeDescriptor>(&self, extents: &Extents) -> error::Result<Vec<T>> {
         let dims = self.dimensions();
         let (start, count, stride) = extents.get_start_count_stride(dims)?;
@@ -597,7 +597,7 @@ impl<'g> Variable<'g> {
     }
 }
 
-impl<'g> VariableMut<'g> {
+impl VariableMut<'_> {
     fn put_values_mono<T: NcTypeDescriptor>(
         &mut self,
         values: &[T],
@@ -804,7 +804,7 @@ impl<'g> VariableMut<'g> {
     }
 }
 
-impl<'g> VariableMut<'g> {
+impl VariableMut<'_> {
     pub(crate) fn add_from_str(
         ncid: nc_type,
         xtype: &NcVariableType,