diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 893cb8d6c..ee2876fce 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -8,3 +8,5 @@ v0.91.0
 - Log more details on gRPC failure
 
 - Log backtraces on panic
+
+- Node: Support H2 when using `localTestServer` mode for Net connections.
diff --git a/node/ts/Native.ts b/node/ts/Native.ts
index bc41d53c9..126e7587f 100644
--- a/node/ts/Native.ts
+++ b/node/ts/Native.ts
@@ -687,7 +687,7 @@ type NativeFunctions = {
   TESTING_CdsiLookupResponseConvert: (asyncRuntime: Wrapper<TokioAsyncContext>) => CancellablePromise<LookupResponse>;
   TESTING_CdsiLookupErrorConvert: (errorDescription: string) => void;
   TESTING_ServerMessageAck_Create: () => ServerMessageAck;
-  TESTING_ConnectionManager_newLocalOverride: (userAgent: string, chatPort: number, cdsiPort: number, svr2Port: number, svrBPort: number, rootCertificateDer: Uint8Array<ArrayBuffer>) => ConnectionManager;
+  TESTING_ConnectionManager_newLocalOverride: (userAgent: string, chatPort: number, cdsiPort: number, svr2Port: number, svrBPort: number, rootCertificateDer: Uint8Array<ArrayBuffer>, httpVersion: number) => ConnectionManager;
   TESTING_ConnectionManager_isUsingProxy: (manager: Wrapper<ConnectionManager>) => number;
   TESTING_CreateOTP: (username: string, secret: Uint8Array<ArrayBuffer>) => string;
   TESTING_CreateOTPFromBase64: (username: string, secret: string) => string;
diff --git a/node/ts/net.ts b/node/ts/net.ts
index a18570936..9a3a80e97 100644
--- a/node/ts/net.ts
+++ b/node/ts/net.ts
@@ -111,6 +111,7 @@ export type NetConstructorOptions = Readonly<
       TESTING_localServer_svr2Port: number;
       TESTING_localServer_svrBPort: number;
       TESTING_localServer_rootCertificateDer: Uint8Array<ArrayBuffer>;
+      TESTING_localServer_httpVersion?: 1 | 2;
     }
 >;
 
@@ -164,7 +165,8 @@ export class Net {
           options.TESTING_localServer_cdsiPort,
           options.TESTING_localServer_svr2Port,
           options.TESTING_localServer_svrBPort,
-          options.TESTING_localServer_rootCertificateDer
+          options.TESTING_localServer_rootCertificateDer,
+          options.TESTING_localServer_httpVersion ?? 1
         )
       );
     } else {
diff --git a/rust/bridge/shared/testing/src/net.rs b/rust/bridge/shared/testing/src/net.rs
index 2bffeb4bf..fd893cc48 100644
--- a/rust/bridge/shared/testing/src/net.rs
+++ b/rust/bridge/shared/testing/src/net.rs
@@ -12,6 +12,7 @@ use libsignal_bridge_types::net::{BuildVariant, ConnectionManager, TokioAsyncCon
 use libsignal_core::E164;
 use libsignal_net::cdsi::{CdsiProtocolError, LookupError, LookupResponse, LookupResponseEntry};
 use libsignal_net::infra::errors::RetryLater;
+use libsignal_net::infra::route::HttpVersion;
 use libsignal_net::infra::ws::attested::AttestedProtocolError;
 use libsignal_protocol::{Aci, Pni};
 use nonzero_ext::nonzero;
@@ -150,6 +151,7 @@ fn TESTING_ConnectionManager_newLocalOverride(
     svr2Port: AsType<NonZeroU16, u16>,
     svrBPort: AsType<NonZeroU16, u16>,
     rootCertificateDer: &[u8],
+    http_version: u8,
 ) -> ConnectionManager {
     let ports = net_env::LocalhostEnvPortConfig {
         chat_port: chatPort.into_inner(),
@@ -157,8 +159,13 @@ fn TESTING_ConnectionManager_newLocalOverride(
         svr2_port: svr2Port.into_inner(),
         svrb_port: svrBPort.into_inner(),
     };
+    let http_version = match http_version {
+        1 => HttpVersion::Http1_1,
+        2 => HttpVersion::Http2,
+        _ => panic!("invalid HTTP version {http_version}"),
+    };
 
-    let env = net_env::localhost_test_env_with_ports(ports, rootCertificateDer);
+    let env = net_env::localhost_test_env_with_ports(ports, rootCertificateDer, http_version);
     ConnectionManager::new_from_static_environment(
         env,
         userAgent.as_str(),
diff --git a/rust/bridge/shared/testing/src/net_env.rs b/rust/bridge/shared/testing/src/net_env.rs
index 8cd856984..9d3b0c5ec 100644
--- a/rust/bridge/shared/testing/src/net_env.rs
+++ b/rust/bridge/shared/testing/src/net_env.rs
@@ -21,6 +21,7 @@ fn localhost_test_domain_config_with_port_and_cert(
     service: ServiceName,
     port: NonZeroU16,
     root_certificate_der: &[u8],
+    http_version: HttpVersion,
 ) -> DomainConfig {
     const LOCALHOST_IP_V4: Ipv4Addr = ip_addr!(v4, "127.0.0.1");
     DomainConfig {
@@ -31,7 +32,7 @@ fn localhost_test_domain_config_with_port_and_cert(
             hostname: "localhost",
             port,
             cert: RootCertificates::FromDer(std::borrow::Cow::Owned(root_certificate_der.to_vec())),
-            http_version: Some(HttpVersion::Http1_1),
+            http_version: Some(http_version),
             min_tls_version: None,
             confirmation_header_name: None,
             proxy: None,
@@ -80,17 +81,20 @@ const DUMMY_KEYTRANS_CONFIG: KeyTransConfig = KeyTransConfig {
 pub(crate) fn localhost_test_env_with_ports(
     ports: LocalhostEnvPortConfig,
     root_certificate_der: &[u8],
+    http_version: HttpVersion,
 ) -> Env<'static> {
     Env {
         chat_domain_config: localhost_test_domain_config_with_port_and_cert(
             ServiceName("chat"),
             ports.chat_port,
             root_certificate_der,
+            http_version,
         ),
         experimental_chat_h2_domain_config: localhost_test_domain_config_with_port_and_cert(
             ServiceName("chat"),
             ports.chat_port,
             root_certificate_der,
+            http_version,
         ),
         chat_ws_config: RECOMMENDED_CHAT_WS_CONFIG,
         cdsi: EnclaveEndpoint {
@@ -98,6 +102,7 @@ pub(crate) fn localhost_test_env_with_ports(
                 ServiceName("cdsi"),
                 ports.cdsi_port,
                 root_certificate_der,
+                http_version,
             ),
             ws_config: RECOMMENDED_WS_CONFIG,
             params: DUMMY_CDSI_ENDPOINT_PARAMS,
@@ -107,6 +112,7 @@ pub(crate) fn localhost_test_env_with_ports(
                 ServiceName("svr2"),
                 ports.svr2_port,
                 root_certificate_der,
+                http_version,
             ),
             ws_config: RECOMMENDED_WS_CONFIG,
             params: DUMMY_SVR2_ENDPOINT_PARAMS,
@@ -118,6 +124,7 @@ pub(crate) fn localhost_test_env_with_ports(
                         ServiceName("svrb"),
                         ports.svrb_port,
                         root_certificate_der,
+                        http_version,
                     ),
                     ws_config: RECOMMENDED_WS_CONFIG,
                     params: DUMMY_SVRB_ENDPOINT_PARAMS,