diff --git a/crates/stemedb-storage/src/trust_graph_store/eigentrust.rs b/crates/stemedb-storage/src/trust_graph_store/eigentrust.rs
index 4f05da9..a0814f9 100644
--- a/crates/stemedb-storage/src/trust_graph_store/eigentrust.rs
+++ b/crates/stemedb-storage/src/trust_graph_store/eigentrust.rs
@@ -68,20 +68,20 @@ pub fn compute_eigentrust_scores(
     let mut idx_to_agent: Vec<[u8; 32]> = Vec::new();
 
     for edge in edges {
-        if !agent_to_idx.contains_key(&edge.from_agent) {
-            agent_to_idx.insert(edge.from_agent, idx_to_agent.len());
+        if let std::collections::hash_map::Entry::Vacant(e) = agent_to_idx.entry(edge.from_agent) {
+            e.insert(idx_to_agent.len());
             idx_to_agent.push(edge.from_agent);
         }
-        if !agent_to_idx.contains_key(&edge.to_agent) {
-            agent_to_idx.insert(edge.to_agent, idx_to_agent.len());
+        if let std::collections::hash_map::Entry::Vacant(e) = agent_to_idx.entry(edge.to_agent) {
+            e.insert(idx_to_agent.len());
             idx_to_agent.push(edge.to_agent);
         }
     }
 
     // Add seed agents that might not have edges
     for (agent, _) in seed_trust {
-        if !agent_to_idx.contains_key(agent) {
-            agent_to_idx.insert(*agent, idx_to_agent.len());
+        if let std::collections::hash_map::Entry::Vacant(e) = agent_to_idx.entry(*agent) {
+            e.insert(idx_to_agent.len());
             idx_to_agent.push(*agent);
         }
     }