diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2985a39..e3f178f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,12 @@ jobs:
           key: ccache-${{ runner.os }}-${{ github.sha }}
           restore-keys: ccache-${{ runner.os }}-
       - name: Checkout Bitcoin Core
-        run: git clone --depth 1 --branch master https://github.com/bitcoin/bitcoin.git
+        run: |
+          git clone --depth 1 https://github.com/bitcoin/bitcoin.git
+          # DO NOT MERGE: switch to bitcoin/bitcoin#33922 PR branch
+          cd bitcoin
+          git fetch --depth 1 origin pull/33922/head:pr-33922
+          git checkout pr-33922
       - name: Build Bitcoin Core
         run: |
           cd bitcoin
diff --git a/capnp/mining.capnp b/capnp/mining.capnp
index cda48c0..b2d0681 100644
--- a/capnp/mining.capnp
+++ b/capnp/mining.capnp
@@ -26,6 +26,7 @@ interface Mining $Proxy.wrap("interfaces::Mining") {
     submitBlock @7 (context :Proxy.Context, block: Data) -> (reason: Text, debug: Text, result: Bool);
     getTransactionsByTxID @8 (context :Proxy.Context, txids: List(Data)) -> (result: List(Data));
     getTransactionsByWitnessID @9 (context :Proxy.Context, wtxids: List(Data)) -> (result: List(Data));
+    getMemoryLoad @10 (context :Proxy.Context) -> (result: MemoryLoad);
 }
 
 interface BlockTemplate $Proxy.wrap("interfaces::BlockTemplate") {
@@ -50,6 +51,10 @@ struct BlockCreateOptions $Proxy.wrap("node::BlockCreateOptions") {
     coinbaseOutputMaxAdditionalSigops @2 :UInt64 = .defaultCoinbaseOutputMaxAdditionalSigops $Proxy.name("coinbase_output_max_additional_sigops");
 }
 
+struct MemoryLoad $Proxy.wrap("interfaces::MemoryLoad") {
+    usage @0 :UInt64;
+}
+
 struct BlockWaitOptions $Proxy.wrap("node::BlockWaitOptions") {
     timeout @0 : Float64 = .maxDouble $Proxy.name("timeout");
     feeThreshold @1 : Int64 = .maxMoney $Proxy.name("fee_threshold");
diff --git a/tests/test.rs b/tests/test.rs
index 153f76e..35adda1 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -143,7 +143,7 @@ fn mining_constants() {
     );
 }
 
-/// isTestChain, isInitialBlockDownload, getTip.
+/// isTestChain, isInitialBlockDownload, getTip, getMemoryLoad.
 #[tokio::test]
 #[serial_test::parallel]
 async fn mining_basic_queries() {
@@ -172,6 +172,16 @@ async fn mining_basic_queries() {
         let tip_hash = tip.get_hash().unwrap();
         assert_eq!(tip_hash.len(), 32, "block hash must be 32 bytes");
         assert!(tip.get_height() >= 0, "height must be non-negative");
+
+        // getMemoryLoad
+        let resp = mining
+            .get_memory_load_request()
+            .send()
+            .promise
+            .await
+            .unwrap();
+        let memory_load = resp.get().unwrap().get_result().unwrap();
+        let _usage: u64 = memory_load.get_usage();
     })
     .await;
 }