diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b691d97..b536193 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,7 +27,7 @@ jobs:
         # informationally check the latest as well.  We should
         # regularly update the known good once we know that tests
         # pass on it
-        rust-toolchain: [ 1.75, stable, nightly ]
+        rust-toolchain: [ 1.77, stable, nightly ]
     steps:
     - uses: actions/checkout@v3
     - name: Setup
@@ -37,9 +37,9 @@ jobs:
     - name: Check clippy
       id: clippy
       run: .github/workflows/clippy.sh ${{ matrix.rust-toolchain }}
-      continue-on-error: ${{ matrix.rust-toolchain != '1.75' }}
+      continue-on-error: ${{ matrix.rust-toolchain != '1.77' }}
     - name: Store clippy flag
-      if: (matrix.rust-toolchain != '1.75')
+      if: (matrix.rust-toolchain != '1.77')
       run: |
         mkdir -p ./clippy-${{ matrix.rust-toolchain }}
         if [[ ${{ steps.clippy.outcome }} == "success" ]] ; then \
@@ -49,7 +49,7 @@ jobs:
         fi
         echo ${{ github.event.number }} > ./clippy-${{ matrix.rust-toolchain }}/issue_num
     - uses: actions/upload-artifact@v3
-      if: (matrix.rust-toolchain != '1.75')
+      if: (matrix.rust-toolchain != '1.77')
       with:
         name: clippy-${{ matrix.rust-toolchain }}
         path: clippy-${{ matrix.rust-toolchain }}/
diff --git a/Cargo.toml b/Cargo.toml
index a6fcb83..f0d9db8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ codespan-reporting = "0.11"
 flate2 = "1"
 is-terminal = "0.4"
 lalrpop-util = { version="0.20", default_features=false, features = ["lexer"] }
-quick-xml = "0.30"
+quick-xml = "0.31"
 sexp = "1.1"
 tar = "0.4"
 termcolor = "1.1"
diff --git a/src/functions.rs b/src/functions.rs
index c355680..d7faa93 100644
--- a/src/functions.rs
+++ b/src/functions.rs
@@ -2157,7 +2157,7 @@ impl<'a> FunctionArgument<'a> {
                 None,
             )?;
 
-            ret.default_value = declared_arg.default.clone();
+            ret.default_value.clone_from(&declared_arg.default);
         }
         Ok(ret)
     }
diff --git a/src/internal_rep.rs b/src/internal_rep.rs
index 3811d6b..38c6363 100644
--- a/src/internal_rep.rs
+++ b/src/internal_rep.rs
@@ -1431,7 +1431,7 @@ impl<'a> ClassList<'a> {
         if class == "any" {
             return true;
         }
-        self.classes.get(class).is_some()
+        self.classes.contains_key(class)
     }
 
     pub fn is_perm(&self, perm: &str, context: &BlockContext) -> bool {
diff --git a/src/lib.rs b/src/lib.rs
index 48be627..e488d51 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,7 +54,7 @@ pub fn compile_combined(
     let errors = CascadeErrors::new();
     let policies = get_policies(input_files)?;
     let mut res = compile_machine_policies_internal(policies, vec!["out".to_string()], true)?;
-    let ret = match res.remove(&"out".to_string()) {
+    let ret = match res.remove("out") {
         Some(s) => s,
         None => return Err(CascadeErrors::from(InternalError::new())),
     };