diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 6b9ac7bc20..bdbeb14b06 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.73.0"
+channel = "1.75.0"
 targets = ["wasm32-unknown-unknown"]
diff --git a/src/archive/tests/tests.rs b/src/archive/tests/tests.rs
index ae97e7b3f5..ec4a616f05 100644
--- a/src/archive/tests/tests.rs
+++ b/src/archive/tests/tests.rs
@@ -38,7 +38,7 @@ fn should_keep_entries_across_upgrades() -> Result<(), CallError> {
 
     let logs = api::get_entries(&env, canister_id, None, None)?;
     assert_eq!(logs.entries.len(), 1);
-    assert_eq!(logs.entries.get(0).unwrap().as_ref().unwrap(), &entry);
+    assert_eq!(logs.entries.first().unwrap().as_ref().unwrap(), &entry);
     let user_logs = api::get_anchor_entries(&env, canister_id, ANCHOR_NUMBER_1, None, None)?;
     assert_eq!(user_logs.entries.len(), 1);
     Ok(())
@@ -84,7 +84,7 @@ mod rollback_tests {
         let logs = api::get_entries(&env, canister_id, None, None)?;
         assert_eq!(logs.entries.len(), 1);
         assert_eq!(
-            CompatEntry::from(logs.entries.get(0).unwrap().clone().unwrap()),
+            CompatEntry::from(logs.entries.first().unwrap().clone().unwrap()),
             entry
         );
         Ok(())
@@ -121,7 +121,7 @@ mod rollback_tests {
         let logs = api::get_entries(&env, canister_id, None, None)?;
         assert_eq!(logs.entries.len(), 2);
         assert_eq!(
-            CompatEntry::from(logs.entries.get(0).unwrap().clone().unwrap()),
+            CompatEntry::from(logs.entries.first().unwrap().clone().unwrap()),
             entry1
         );
         assert_eq!(
@@ -216,7 +216,7 @@ mod read_tests {
         let logs = api::get_entries(&env, canister_id, None, None)?;
         assert_eq!(logs.entries.len(), 1);
         assert_eq!(
-            logs.entries.get(0).unwrap().as_ref().unwrap(),
+            logs.entries.first().unwrap().as_ref().unwrap(),
             &log_entry_1()
         );
         Ok(())
@@ -251,14 +251,14 @@ mod read_tests {
         let user_1_logs = api::get_anchor_entries(&env, canister_id, ANCHOR_NUMBER_1, None, None)?;
         assert_eq!(user_1_logs.entries.len(), 1);
         assert_eq!(
-            user_1_logs.entries.get(0).unwrap().as_ref().unwrap(),
+            user_1_logs.entries.first().unwrap().as_ref().unwrap(),
             &log_entry_1()
         );
 
         let user_2_logs = api::get_anchor_entries(&env, canister_id, ANCHOR_NUMBER_2, None, None)?;
         assert_eq!(user_2_logs.entries.len(), 1);
         assert_eq!(
-            user_2_logs.entries.get(0).unwrap().as_ref().unwrap(),
+            user_2_logs.entries.first().unwrap().as_ref().unwrap(),
             &log_entry_2()
         );
 
@@ -319,7 +319,7 @@ mod read_tests {
             assert_eq!(logs.entries.len(), 2);
             assert_eq!(
                 logs.entries
-                    .get(0)
+                    .first()
                     .unwrap()
                     .as_ref()
                     .unwrap()
@@ -404,7 +404,7 @@ mod read_tests {
         )?;
         assert_eq!(logs.entries.len(), 2);
         assert_eq!(
-            logs.entries.get(0).unwrap().as_ref().unwrap(),
+            logs.entries.first().unwrap().as_ref().unwrap(),
             &log_entry_2()
         );
         assert_eq!(
@@ -449,7 +449,7 @@ mod read_tests {
 
         let logs = api::get_anchor_entries(&env, canister_id, ANCHOR_NUMBER_1, None, None)?;
         assert_eq!(logs.entries.len(), 3);
-        assert_eq!(logs.entries.get(0).unwrap().as_ref().unwrap().timestamp, 1);
+        assert_eq!(logs.entries.first().unwrap().as_ref().unwrap().timestamp, 1);
         assert_eq!(
             logs.entries.get(1).unwrap().as_ref().unwrap().timestamp,
             1u64 << 8
@@ -749,7 +749,7 @@ mod stable_memory_tests {
             sequence_number: 0,
         };
         assert_eq!(
-            entries.entries.get(0).unwrap().as_ref().unwrap(),
+            entries.entries.first().unwrap().as_ref().unwrap(),
             &register_entry
         );
 
diff --git a/src/internet_identity/tests/integration/archive_integration.rs b/src/internet_identity/tests/integration/archive_integration.rs
index 1850fca81b..4f2f4e85f5 100644
--- a/src/internet_identity/tests/integration/archive_integration.rs
+++ b/src/internet_identity/tests/integration/archive_integration.rs
@@ -261,7 +261,7 @@ mod pull_entries_tests {
             sequence_number: 0,
         };
         assert_eq!(
-            entries.entries.get(0).unwrap().as_ref().unwrap(),
+            entries.entries.first().unwrap().as_ref().unwrap(),
             &register_entry
         );
 
@@ -375,7 +375,7 @@ mod pull_entries_tests {
             sequence_number: 0,
         };
         assert_eq!(
-            entries.entries.get(0).unwrap().as_ref().unwrap(),
+            entries.entries.first().unwrap().as_ref().unwrap(),
             &expected_register_entry
         );
 
@@ -506,7 +506,7 @@ mod pull_entries_tests {
             sequence_number: 0,
         };
         assert_eq!(
-            entries.entries.get(0).unwrap().as_ref().unwrap(),
+            entries.entries.first().unwrap().as_ref().unwrap(),
             &expected_metadata_entry
         );
 
@@ -715,7 +715,7 @@ mod pull_entries_tests {
             message: format!("Canister {} is stopped", ii_canister.to_text()),
         };
         assert_eq!(
-            status.call_info.call_errors.get(0).unwrap(),
+            status.call_info.call_errors.first().unwrap(),
             &expected_error
         );
         Ok(())
diff --git a/src/vc_util/src/lib.rs b/src/vc_util/src/lib.rs
index 824f7e9fdd..3be5786176 100644
--- a/src/vc_util/src/lib.rs
+++ b/src/vc_util/src/lib.rs
@@ -212,13 +212,9 @@ pub fn verify_ii_presentation_jwt_with_canister_ids(
             "expected exactly two verifiable credentials".to_string(),
         ));
     }
-    let id_alias_vc_jws =
-        presentation
-            .verifiable_credential
-            .get(0)
-            .ok_or(PresentationVerificationError::Unknown(
-                "missing id_alias vc".to_string(),
-            ))?;
+    let id_alias_vc_jws = presentation.verifiable_credential.first().ok_or(
+        PresentationVerificationError::Unknown("missing id_alias vc".to_string()),
+    )?;
     let alias_tuple = get_verified_id_alias_from_jws(
         id_alias_vc_jws.as_str(),
         &vc_flow_signers.ii_canister_id,