diff --git a/.github/workflows/integration_tests_validation.yaml b/.github/workflows/integration_tests_validation.yaml
index 262c4d944..5ca69cfc3 100644
--- a/.github/workflows/integration_tests_validation.yaml
+++ b/.github/workflows/integration_tests_validation.yaml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.56.1, 1.57.0]
+        rust: [1.56.1, 1.58.0]
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b8316efe5..7eb9a9447 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,14 +22,14 @@ jobs:
             ./crates/libcgroups: crates/libcgroups/**
             ./crates/libseccomp: crates/libseccomp/**
             ./crates/integration_test: crates/integration_test/**
-            ./runtimetest : runtimetest/**        
+            ./runtimetest : runtimetest/**
   check:
     needs: [changes]
     if: ${{ !contains(needs.changes.outputs.dirs, '[]') }}
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.56.1, 1.57.0]
+        rust: [1.56.1, 1.58.0]
         dirs: ${{ fromJSON(needs.changes.outputs.dirs) }}
     steps:
       - uses: actions/checkout@v2
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.56.1, 1.57.0]
+        rust: [1.56.1, 1.58.0]
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -102,7 +102,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: [1.56.1, 1.57.0]
+        rust: [1.56.1, 1.58.0]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -124,6 +124,6 @@ jobs:
         run: ./build.sh --release
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.11.0'
+          go-version: "1.11.0"
       - name: Run integration tests
         run: ./integration_test.sh
diff --git a/crates/libcgroups/src/systemd/manager.rs b/crates/libcgroups/src/systemd/manager.rs
index 72aeae69c..0d85269d4 100644
--- a/crates/libcgroups/src/systemd/manager.rs
+++ b/crates/libcgroups/src/systemd/manager.rs
@@ -232,7 +232,7 @@ impl Manager {
         let controllers: Vec<String> = self
             .get_available_controllers(&full_boundary_path)?
             .into_iter()
-            .map(|c| format!("{}{}", "+", c.to_string()))
+            .map(|c| format!("{}{}", "+", c))
             .collect();
 
         Self::write_controllers(&full_boundary_path, &controllers)?;
diff --git a/crates/libcgroups/src/v2/manager.rs b/crates/libcgroups/src/v2/manager.rs
index 7465bb4b2..3baeb86a6 100644
--- a/crates/libcgroups/src/v2/manager.rs
+++ b/crates/libcgroups/src/v2/manager.rs
@@ -52,7 +52,7 @@ impl Manager {
     fn create_unified_cgroup(&self, pid: Pid) -> Result<()> {
         let controllers: Vec<String> = util::get_available_controllers(&self.root_path)?
             .iter()
-            .map(|c| format!("{}{}", "+", c.to_string()))
+            .map(|c| format!("{}{}", "+", c))
             .collect();
 
         Self::write_controllers(&self.root_path, &controllers)?;