diff --git a/.changelog/unreleased/improvements/2476-masp-checked-ops.md b/.changelog/unreleased/improvements/2476-masp-checked-ops.md
new file mode 100644
index 0000000000..c7898a8b44
--- /dev/null
+++ b/.changelog/unreleased/improvements/2476-masp-checked-ops.md
@@ -0,0 +1,2 @@
+- Removed possible over/under-flow of `I128Sum` operations in the masp vp.
+  ([\#2476](https://github.com/anoma/namada/pull/2476))
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
index 008530945b..e793f8e5b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3897,7 +3897,7 @@ dependencies = [
 [[package]]
 name = "masp_note_encryption"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "borsh",
  "chacha20",
@@ -3910,7 +3910,7 @@ dependencies = [
 [[package]]
 name = "masp_primitives"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "aes",
  "bip0039",
@@ -3942,7 +3942,7 @@ dependencies = [
 [[package]]
 name = "masp_proofs"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "bellman",
  "blake2b_simd",
@@ -4162,6 +4162,7 @@ dependencies = [
  "namada_tx_env",
  "namada_vote_ext",
  "namada_vp_env",
+ "num-traits 0.2.17",
  "num256",
  "orion",
  "owo-colors",
diff --git a/Cargo.toml b/Cargo.toml
index de1555a20a..df4e7dec1c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -114,8 +114,8 @@ ledger-transport-hid = "0.10.0"
 libc = "0.2.97"
 libloading = "0.7.2"
 # branch = "murisi/namada-integration"
-masp_primitives = { git = "https://github.com/anoma/masp", tag = "v1.0.0" }
-masp_proofs = { git = "https://github.com/anoma/masp", tag = "v1.0.0", default-features = false, features = ["local-prover"] }
+masp_primitives = { git = "https://github.com/anoma/masp", tag = "v1.1.0" }
+masp_proofs = { git = "https://github.com/anoma/masp", tag = "v1.1.0", default-features = false, features = ["local-prover"] }
 num256 = "0.3.5"
 num_cpus = "1.13.0"
 num-derive = "0.3.3"
diff --git a/crates/namada/Cargo.toml b/crates/namada/Cargo.toml
index 0180115988..3026aff756 100644
--- a/crates/namada/Cargo.toml
+++ b/crates/namada/Cargo.toml
@@ -109,6 +109,7 @@ loupe = { version = "0.1.3", optional = true }
 masp_primitives.workspace = true
 masp_proofs.workspace = true
 num256.workspace = true
+num-traits.workspace = true
 orion.workspace = true
 owo-colors = "3.5.0"
 parity-wasm = { version = "0.45.0", features = ["sign_ext"], optional = true }
diff --git a/crates/namada/src/ledger/native_vp/masp.rs b/crates/namada/src/ledger/native_vp/masp.rs
index 1b9d3b4d90..b222aeaf9b 100644
--- a/crates/namada/src/ledger/native_vp/masp.rs
+++ b/crates/namada/src/ledger/native_vp/masp.rs
@@ -19,6 +19,7 @@ use namada_state::{OptionExt, ResultExt};
 use namada_token::read_denom;
 use namada_tx::Tx;
 use namada_vp_env::VpEnv;
+use num_traits::ops::checked::{CheckedAdd, CheckedSub};
 use ripemd::Digest as RipemdDigest;
 use sha2::Digest as Sha2Digest;
 use thiserror::Error;
@@ -462,12 +463,18 @@ where
             // 3. Public key must be the hash of the source
             for vin in &transp_bundle.vin {
                 // Non-masp sources add to the transparent tx pool
-                transparent_tx_pool += I128Sum::from_nonnegative(
-                    vin.asset_type,
-                    vin.value as i128,
-                )
-                .ok()
-                .ok_or_err_msg("invalid value or asset type for amount")?;
+                transparent_tx_pool = transparent_tx_pool
+                    .checked_add(
+                        &I128Sum::from_nonnegative(
+                            vin.asset_type,
+                            vin.value as i128,
+                        )
+                        .ok()
+                        .ok_or_err_msg(
+                            "invalid value or asset type for amount",
+                        )?,
+                    )
+                    .ok_or_err_msg("Overflow in input sum")?;
 
                 // Satisfies 3.
                 if <[u8; 20]>::from(hash) != vin.address.0 {
@@ -608,12 +615,18 @@ where
             for out in &transp_bundle.vout {
                 // Non-masp destinations subtract from transparent tx
                 // pool
-                transparent_tx_pool -= I128Sum::from_nonnegative(
-                    out.asset_type,
-                    out.value as i128,
-                )
-                .ok()
-                .ok_or_err_msg("invalid value or asset type for amount")?;
+                transparent_tx_pool = transparent_tx_pool
+                    .checked_sub(
+                        &I128Sum::from_nonnegative(
+                            out.asset_type,
+                            out.value as i128,
+                        )
+                        .ok()
+                        .ok_or_err_msg(
+                            "invalid value or asset type for amount",
+                        )?,
+                    )
+                    .ok_or_err_msg("Underflow in output subtraction")?;
 
                 // Satisfies 3.
                 if <[u8; 20]>::from(hash) != out.address.0 {
diff --git a/wasm/Cargo.lock b/wasm/Cargo.lock
index 83de29e525..180d11da1b 100644
--- a/wasm/Cargo.lock
+++ b/wasm/Cargo.lock
@@ -3134,7 +3134,7 @@ dependencies = [
 [[package]]
 name = "masp_note_encryption"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "borsh",
  "chacha20",
@@ -3147,7 +3147,7 @@ dependencies = [
 [[package]]
 name = "masp_primitives"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "aes",
  "bip0039",
@@ -3179,7 +3179,7 @@ dependencies = [
 [[package]]
 name = "masp_proofs"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "bellman",
  "blake2b_simd",
@@ -3350,6 +3350,7 @@ dependencies = [
  "namada_tx_env",
  "namada_vote_ext",
  "namada_vp_env",
+ "num-traits",
  "num256",
  "orion",
  "owo-colors",
diff --git a/wasm_for_tests/wasm_source/Cargo.lock b/wasm_for_tests/wasm_source/Cargo.lock
index 2744978c64..ad94e56a74 100644
--- a/wasm_for_tests/wasm_source/Cargo.lock
+++ b/wasm_for_tests/wasm_source/Cargo.lock
@@ -3134,7 +3134,7 @@ dependencies = [
 [[package]]
 name = "masp_note_encryption"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "borsh",
  "chacha20",
@@ -3147,7 +3147,7 @@ dependencies = [
 [[package]]
 name = "masp_primitives"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "aes",
  "bip0039",
@@ -3179,7 +3179,7 @@ dependencies = [
 [[package]]
 name = "masp_proofs"
 version = "1.0.0"
-source = "git+https://github.com/anoma/masp?tag=v1.0.0#c3c6047a9c9da54058afc71219b913ac9f79e48b"
+source = "git+https://github.com/anoma/masp?tag=v1.1.0#f24691c0eb76909e3c15ae03aef294dccebd2df3"
 dependencies = [
  "bellman",
  "blake2b_simd",
@@ -3350,6 +3350,7 @@ dependencies = [
  "namada_tx_env",
  "namada_vote_ext",
  "namada_vp_env",
+ "num-traits",
  "num256",
  "orion",
  "owo-colors",