diff --git a/benches/bench.rs b/benches/bench.rs
index 4386cc44b..a987c7562 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -30,7 +30,7 @@ struct CpuProfiler<'a> {
 }
 
 #[cfg(unix)]
-impl<'a> Profiler for CpuProfiler<'a> {
+impl Profiler for CpuProfiler<'_> {
     fn start_profiling(&mut self, _benchmark_id: &str, benchmark_dir: &Path) {
         create_dir_all(benchmark_dir).unwrap();
 
diff --git a/src/json/value.rs b/src/json/value.rs
index 10a0b63e9..0217d52eb 100644
--- a/src/json/value.rs
+++ b/src/json/value.rs
@@ -50,7 +50,7 @@ impl<'rc> ScopedJson<'rc> {
     }
 }
 
-impl<'reg: 'rc, 'rc> From<Json> for ScopedJson<'rc> {
+impl<'rc> From<Json> for ScopedJson<'rc> {
     fn from(v: Json) -> ScopedJson<'rc> {
         ScopedJson::Derived(v)
     }
diff --git a/src/registry.rs b/src/registry.rs
index 695e26a7c..16246c0d0 100644
--- a/src/registry.rs
+++ b/src/registry.rs
@@ -77,7 +77,7 @@ pub struct Registry<'reg> {
         HashMap<String, Arc<dyn Source<Item = String, Error = IoError> + Send + Sync + 'reg>>,
 }
 
-impl<'reg> Debug for Registry<'reg> {
+impl Debug for Registry<'_> {
     fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
         f.debug_struct("Handlebars")
             .field("templates", &self.templates)
@@ -89,7 +89,7 @@ impl<'reg> Debug for Registry<'reg> {
     }
 }
 
-impl<'reg> Default for Registry<'reg> {
+impl Default for Registry<'_> {
     fn default() -> Self {
         Self::new()
     }
diff --git a/src/render.rs b/src/render.rs
index f3cd45aa3..d56e7403e 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -314,7 +314,7 @@ impl<'reg: 'rc, 'rc> RenderContext<'reg, 'rc> {
     }
 }
 
-impl<'reg, 'rc> fmt::Debug for RenderContext<'reg, 'rc> {
+impl fmt::Debug for RenderContext<'_, '_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         f.debug_struct("RenderContextInner")
             .field("dev_mode_templates", &self.dev_mode_templates)
diff --git a/tests/data_helper.rs b/tests/data_helper.rs
index 42f2067cd..0bd81d0a7 100644
--- a/tests/data_helper.rs
+++ b/tests/data_helper.rs
@@ -3,7 +3,7 @@ use serde_json::json;
 
 struct HelperWithBorrowedData<'a>(&'a String);
 
-impl<'a> HelperDef for HelperWithBorrowedData<'a> {
+impl HelperDef for HelperWithBorrowedData<'_> {
     fn call<'_reg: '_rc, '_rc>(
         &self,
         _: &Helper<'_rc>,