diff --git a/install.sh b/install.sh
index 81eedc68..851398ca 100755
--- a/install.sh
+++ b/install.sh
@@ -682,7 +682,7 @@ build_all()
 {
     build_from_tarball_boost $BOOST_URL $BOOST_ARCHIVE bzip2 . $PARALLEL "$BUILD_BOOST" "${BOOST_OPTIONS[@]}"
     build_from_github zeromq libzmq master $PARALLEL ${ZMQ_OPTIONS[@]} "$@"
-    build_from_github libbitcoin secp256k1 version4 $PARALLEL ${SECP256K1_OPTIONS[@]} "$@"
+    build_from_github libbitcoin secp256k1 version5 $PARALLEL ${SECP256K1_OPTIONS[@]} "$@"
     build_from_github libbitcoin libbitcoin version3 $PARALLEL ${BITCOIN_OPTIONS[@]} "$@"
     build_from_travis libbitcoin libbitcoin-protocol version3 $PARALLEL ${BITCOIN_PROTOCOL_OPTIONS[@]} "$@"
 }
diff --git a/test/zmq/identifiers.cpp b/test/zmq/identifiers.cpp
index b62f0ca6..d1e7dfd7 100644
--- a/test/zmq/identifiers.cpp
+++ b/test/zmq/identifiers.cpp
@@ -55,7 +55,7 @@ BOOST_AUTO_TEST_CASE(identifiers__contains__default__not_zero)
 
 BOOST_AUTO_TEST_CASE(identifiers__contains__one_value__expected)
 {
-    const auto expected = 42u;
+    const intptr_t expected = 42u;
     identifiers_fixture instance;
     instance.push(reinterpret_cast<void*>(expected));
     BOOST_REQUIRE(instance.contains(expected));
@@ -63,8 +63,8 @@ BOOST_AUTO_TEST_CASE(identifiers__contains__one_value__expected)
 
 BOOST_AUTO_TEST_CASE(identifiers__contains__two_values__expected)
 {
-    const auto expected1 = 99u;
-    const auto expected2 = 42u;
+    const intptr_t expected1 = 99u;
+    const intptr_t expected2 = 42u;
     identifiers_fixture instance;
     instance.push(reinterpret_cast<void*>(expected1));
     instance.push(reinterpret_cast<void*>(expected2));