diff --git a/Cargo.toml b/Cargo.toml
index 2c453a71..655d8c26 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ fpe = "0.5"
 group = "0.11"
 halo2 = "0.0"
 lazy_static = "1"
-memuse = { version = "0.1", features = ["nonempty"] }
+memuse = { version = "0.2", features = ["nonempty"] }
 pasta_curves = "0.2"
 proptest = { version = "1.0.0", optional = true }
 rand = "0.8"
diff --git a/src/bundle.rs b/src/bundle.rs
index d022bbfd..d095e8da 100644
--- a/src/bundle.rs
+++ b/src/bundle.rs
@@ -5,7 +5,7 @@ pub mod commitments;
 use std::io;
 
 use blake2b_simd::Hash as Blake2bHash;
-use memuse::{DynamicUsage, NoDynamicUsage};
+use memuse::DynamicUsage;
 use nonempty::NonEmpty;
 use zcash_note_encryption::try_note_decryption;
 
@@ -134,7 +134,17 @@ impl<T> Action<T> {
     }
 }
 
-impl NoDynamicUsage for Action<redpallas::Signature<SpendAuth>> {}
+impl DynamicUsage for Action<redpallas::Signature<SpendAuth>> {
+    #[inline(always)]
+    fn dynamic_usage(&self) -> usize {
+        0
+    }
+
+    #[inline(always)]
+    fn dynamic_usage_bounds(&self) -> (usize, Option<usize>) {
+        (0, Some(0))
+    }
+}
 
 /// Orchard-specific flags.
 #[derive(Clone, Copy, Debug)]