diff --git a/lib/src/executor/host.rs b/lib/src/executor/host.rs
index 33cf1a9f54..73894782b5 100644
--- a/lib/src/executor/host.rs
+++ b/lib/src/executor/host.rs
@@ -2290,6 +2290,22 @@ impl ReadyToRun {
                     },
                 }
             }
+            HostFunction::ext_transaction_index_index_version_1 => {
+                // TODO: this is currently a no-op; because not all the parameters are verified, this might lead to consensus issues
+                let _tx_ptr = expect_pointer_size_raw!(0);
+                HostVm::ReadyToRun(ReadyToRun {
+                    inner: self.inner,
+                    resume_value: None,
+                })
+            }
+            HostFunction::ext_transaction_index_renew_version_1 => {
+                // TODO: this is currently a no-op; because not all the parameters are verified, this might lead to consensus issues
+                let _tx_ptr = expect_pointer_size_raw!(0);
+                HostVm::ReadyToRun(ReadyToRun {
+                    inner: self.inner,
+                    resume_value: None,
+                })
+            }
         }
     }
 }
diff --git a/lib/src/executor/host/functions.rs b/lib/src/executor/host/functions.rs
index c20fd490d6..fcf4d07ebe 100644
--- a/lib/src/executor/host/functions.rs
+++ b/lib/src/executor/host/functions.rs
@@ -156,6 +156,8 @@ host_functions! {
     ext_logging_log_version_1,
     ext_logging_max_level_version_1,
     ext_panic_handler_abort_on_panic_version_1,
+    ext_transaction_index_index_version_1,
+    ext_transaction_index_renew_version_1,
 }
 
 impl HostFunction {
@@ -456,6 +458,12 @@ impl HostFunction {
             HostFunction::ext_panic_handler_abort_on_panic_version_1 => {
                 crate::signature!((vm::ValueType::I64) => ())
             }
+            HostFunction::ext_transaction_index_index_version_1 => {
+                crate::signature!((vm::ValueType::I32, vm::ValueType::I32, vm::ValueType::I32) => ())
+            }
+            HostFunction::ext_transaction_index_renew_version_1 => {
+                crate::signature!((vm::ValueType::I32, vm::ValueType::I32) => ())
+            }
         }
     }
 }
diff --git a/wasm-node/CHANGELOG.md b/wasm-node/CHANGELOG.md
index a943ee6060..ff2a923548 100644
--- a/wasm-node/CHANGELOG.md
+++ b/wasm-node/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Added
+
+- Add support for the `ext_transaction_index_index_version_1` and `ext_transaction_index_renew_version_1` host functions as no-op. ([#2189](https://github.com/smol-dot/smoldot/pull/2189))
+
 ## 2.0.39 - 2025-09-15
 
 ### Fixed