diff --git a/light-node/Cargo.toml b/light-node/Cargo.toml
index 9a47833f9..a81e074e4 100644
--- a/light-node/Cargo.toml
+++ b/light-node/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 gumdrop = "0.7"
 serde = { version = "1", features = ["serde_derive"] }
-tendermint = { version = "0.11", path = "../tendermint" }
+tendermint = { version = "0.12.0-rc0", path = "../tendermint" }
 tokio = "0.2"
 
 [dependencies.abscissa_core]
diff --git a/light-node/src/commands/start.rs b/light-node/src/commands/start.rs
index 0de9339d9..f8e4e6f7f 100644
--- a/light-node/src/commands/start.rs
+++ b/light-node/src/commands/start.rs
@@ -68,8 +68,7 @@ impl Runnable for StartCmd {
 
             println!(
                 "attempting bisection from height {:?} to height {:?}",
-                latest_trusted_height,
-                latest_peer_height,
+                latest_trusted_height, latest_peer_height,
             );
 
             let now = &SystemTime::now();
diff --git a/light-node/src/requester.rs b/light-node/src/requester.rs
index b7ffdb042..f27292a93 100644
--- a/light-node/src/requester.rs
+++ b/light-node/src/requester.rs
@@ -1,9 +1,12 @@
-use tendermint::block;
-use tendermint::lite;
+use tendermint::block::signed_header::SignedHeader as TMCommit;
+use tendermint::block::Header as TMHeader;
 use tendermint::rpc;
 use tendermint::validator;
+use tendermint::{block, lite};
 
 use core::future::Future;
+use tendermint::lite::{Height, SignedHeader};
+use tendermint::validator::Set;
 use tokio::runtime::Builder;
 
 /// RPCRequester wraps the Tendermint rpc::Client.
@@ -17,33 +20,26 @@ impl RPCRequester {
     }
 }
 
-impl lite::types::Requester for RPCRequester {
-    type SignedHeader = block::signed_header::SignedHeader;
-    type ValidatorSet = validator::Set;
+type TMSignedHeader = SignedHeader<TMCommit, TMHeader>;
 
+impl lite::types::Requester<TMCommit, TMHeader> for RPCRequester {
     /// Request the signed header at height h.
     /// If h==0, request the latest signed header.
     /// TODO: use an enum instead of h==0.
-    fn signed_header<H>(&self, h: H) -> Result<Self::SignedHeader, lite::Error>
-    where
-        H: Into<block::Height>,
-    {
+    fn signed_header(&self, h: Height) -> Result<TMSignedHeader, lite::Error> {
         let height: block::Height = h.into();
         let r = match height.value() {
             0 => block_on(self.client.latest_commit()),
             _ => block_on(self.client.commit(height)),
         };
         match r {
-            Ok(response) => Ok(response.signed_header),
+            Ok(response) => Ok(response.signed_header.into()),
             Err(_error) => Err(lite::Error::RequestFailed),
         }
     }
 
     /// Request the validator set at height h.
-    fn validator_set<H>(&self, h: H) -> Result<Self::ValidatorSet, lite::Error>
-    where
-        H: Into<block::Height>,
-    {
+    fn validator_set(&self, h: Height) -> Result<Set, lite::Error> {
         let r = block_on(self.client.validators(h));
         match r {
             Ok(response) => Ok(validator::Set::new(response.validators)),
@@ -66,7 +62,6 @@ mod tests {
     use super::*;
     use tendermint::lite::types::Header as LiteHeader;
     use tendermint::lite::types::Requester as LiteRequester;
-    use tendermint::lite::types::SignedHeader as LiteSignedHeader;
     use tendermint::lite::types::ValidatorSet as LiteValSet;
     use tendermint::rpc;
 
diff --git a/light-node/src/store.rs b/light-node/src/store.rs
index cbebe6697..c78eb01dd 100644
--- a/light-node/src/store.rs
+++ b/light-node/src/store.rs
@@ -1,8 +1,9 @@
-use crate::state::State;
-use tendermint::block::Height;
-use tendermint::lite::{Error, Header, SignedHeader, Store, TrustedState};
+use tendermint::lite::{Error, Header, Height, TrustedState};
 
 use std::collections::HashMap;
+use tendermint::block;
+
+pub type State = TrustedState<block::signed_header::SignedHeader, block::header::Header>;
 
 #[derive(Default)]
 pub struct MemStore {
@@ -13,25 +14,23 @@ pub struct MemStore {
 impl MemStore {
     pub fn new() -> MemStore {
         MemStore {
-            height: Height::from(0),
+            height: 0,
             store: HashMap::new(),
         }
     }
 }
 
-impl Store for MemStore {
-    type TrustedState = State;
-
-    fn add(&mut self, trusted: &Self::TrustedState) -> Result<(), Error> {
+impl MemStore {
+    pub fn add(&mut self, trusted: State) -> Result<(), Error> {
         let height = trusted.last_header().header().height();
         self.height = height;
-        self.store.insert(height, trusted.clone());
+        self.store.insert(height, trusted);
         Ok(())
     }
 
-    fn get(&self, h: Height) -> Result<&Self::TrustedState, Error> {
+    pub fn get(&self, h: Height) -> Result<&State, Error> {
         let mut height = h;
-        if h.value() == 0 {
+        if h == 0 {
             height = self.height
         }
         match self.store.get(&height) {