diff --git a/pallas-codec/Cargo.toml b/pallas-codec/Cargo.toml
index 42ae94f..8efc320 100644
--- a/pallas-codec/Cargo.toml
+++ b/pallas-codec/Cargo.toml
@@ -14,6 +14,6 @@ authors = [
 
 [dependencies]
 hex = "0.4.3"
-minicbor = { version = "0.17", features = ["std", "half", "derive"] }
+minicbor = { version = "0.18", features = ["std", "half", "derive"] }
 serde = { version = "1.0.143", features = ["derive"] }
 
diff --git a/pallas-traverse/src/output.rs b/pallas-traverse/src/output.rs
index f431499..51a239c 100644
--- a/pallas-traverse/src/output.rs
+++ b/pallas-traverse/src/output.rs
@@ -101,11 +101,12 @@ impl<'b> MultiEraOutput<'b> {
         }
     }
 
-    pub fn encode(&self) -> Result<Vec<u8>, minicbor::encode::Error<std::io::Error>> {
+    pub fn encode(&self) -> Vec<u8> {
+        // to_vec is infallible
         match self {
-            Self::AlonzoCompatible(x) => minicbor::to_vec(x),
-            Self::Babbage(x) => minicbor::to_vec(x),
-            Self::Byron(x) => minicbor::to_vec(x),
+            Self::AlonzoCompatible(x) => minicbor::to_vec(x).unwrap(),
+            Self::Babbage(x) => minicbor::to_vec(x).unwrap(),
+            Self::Byron(x) => minicbor::to_vec(x).unwrap(),
         }
     }
 
diff --git a/pallas-traverse/src/tx.rs b/pallas-traverse/src/tx.rs
index 2600393..241630a 100644
--- a/pallas-traverse/src/tx.rs
+++ b/pallas-traverse/src/tx.rs
@@ -24,11 +24,12 @@ impl<'b> MultiEraTx<'b> {
         Self::Babbage(Box::new(Cow::Borrowed(tx)))
     }
 
-    pub fn encode(&self) -> Result<Vec<u8>, minicbor::encode::Error<std::io::Error>> {
+    pub fn encode(&self) -> Vec<u8> {
+        // to_vec is infallible
         match self {
-            MultiEraTx::AlonzoCompatible(x, _) => minicbor::to_vec(x),
-            MultiEraTx::Babbage(x) => minicbor::to_vec(x),
-            MultiEraTx::Byron(x) => minicbor::to_vec(x),
+            MultiEraTx::AlonzoCompatible(x, _) => minicbor::to_vec(x).unwrap(),
+            MultiEraTx::Babbage(x) => minicbor::to_vec(x).unwrap(),
+            MultiEraTx::Byron(x) => minicbor::to_vec(x).unwrap(),
         }
     }