diff --git a/.github/workflows/checking.yml b/.github/workflows/checking.yml
index 43c142156..faa6975d0 100644
--- a/.github/workflows/checking.yml
+++ b/.github/workflows/checking.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - 1.87.0
+          - 1.88.0
           - stable
           - nightly
         os:
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 6892dbab3..46eac8ab4 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - 1.87.0
+          - 1.88.0
           - stable
         os:
           - ubuntu-latest
@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
       matrix:
         toolchain:
-          - 1.87.0
+          - 1.88.0
           - stable
         os:
           - ubuntu-latest
diff --git a/algorithms/linfa-lars/src/algorithm.rs b/algorithms/linfa-lars/src/algorithm.rs
index 9088e5a73..25254e90d 100644
--- a/algorithms/linfa-lars/src/algorithm.rs
+++ b/algorithms/linfa-lars/src/algorithm.rs
@@ -123,16 +123,15 @@ fn lars_path<F: Float>(
     }
 
     loop {
-        let c;
         let mut c_idx = 0;
         let mut c_ = F::zero();
-        if !cov.is_empty() {
+        let c = if !cov.is_empty() {
             c_idx = cov.abs().argmax().unwrap();
             c_ = cov[c_idx];
-            c = c_.abs();
+            c_.abs()
         } else {
-            c = F::zero();
-        }
+            F::zero()
+        };
 
         let mut alpha = alphas.slice(s![n_iter, NewAxis]).to_owned();
         let mut coef = coefs.row(n_iter).to_owned();
diff --git a/src/dataset/impl_dataset.rs b/src/dataset/impl_dataset.rs
index 27cc9acff..b92a1dab1 100644
--- a/src/dataset/impl_dataset.rs
+++ b/src/dataset/impl_dataset.rs
@@ -1000,7 +1000,7 @@ where
     where
         ER: std::error::Error + std::convert::From<crate::error::Error>,
         M: for<'c> Fit<ArrayView2<'c, F>, ArrayView<'c, E, I>, ER, Object = O>,
-        O: for<'d> PredictInplace<ArrayView2<'a, F>, Array<E, I>>,
+        O: PredictInplace<ArrayView2<'a, F>, Array<E, I>>,
         FACC: Float,
         C: Fn(
             &Array<E, I>,
@@ -1061,7 +1061,7 @@ where
     where
         ER: std::error::Error + std::convert::From<crate::error::Error>,
         M: for<'c> Fit<ArrayView2<'c, F>, ArrayView1<'c, E>, ER, Object = O>,
-        O: for<'d> PredictInplace<ArrayView2<'a, F>, Array1<E>>,
+        O: PredictInplace<ArrayView2<'a, F>, Array1<E>>,
         FACC: Float,
         C: Fn(&Array1<E>, &ArrayView1<E>) -> std::result::Result<FACC, crate::error::Error>,
     {