diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Copyright (c) 2017 The Bitcoin developers
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 project(BitcoinABC)
 
 # Add path for custom modules
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,14 @@
 # Copyright (c) 2017 The Bitcoin developers
 
+cmake_minimum_required(VERSION 3.5)
+project(BitcoinABC)
+
 set(CMAKE_CXX_STANDARD 11)
 
+# Default visibility is hidden on all targets.
+set(CMAKE_C_VISIBILITY_PRESET hidden)
+set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+
 option(BUILD_BITCOIN_WALLET "Activate the wallet functionality" ON)
 option(BUILD_BITCOIN_ZMQ "Activate the ZeroMQ functionalities" ON)
 option(BUILD_BITCOIN_SEEDER "Build bitcoin-seeder" ON)
diff --git a/src/leveldb/CMakeLists.txt b/src/leveldb/CMakeLists.txt
--- a/src/leveldb/CMakeLists.txt
+++ b/src/leveldb/CMakeLists.txt
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 project(Leveldb VERSION 0.1.0 LANGUAGES C CXX)
 
 # This project can take advantage of C++11.
diff --git a/src/secp256k1/CMakeLists.txt b/src/secp256k1/CMakeLists.txt
--- a/src/secp256k1/CMakeLists.txt
+++ b/src/secp256k1/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Copyright (c) 2017 The Bitcoin developers
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 project(secp256k1)
 
 # libsecp256k1 use a different set of flags.
@@ -17,6 +17,9 @@
 	-Wno-long-long
 )
 
+# Default visibility is hidden on all targets.
+set(CMAKE_C_VISIBILITY_PRESET hidden)
+
 # TODO: change this to include when possible
 include_directories(
 	.
diff --git a/src/univalue/CMakeLists.txt b/src/univalue/CMakeLists.txt
--- a/src/univalue/CMakeLists.txt
+++ b/src/univalue/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Copyright (c) 2017 The Bitcoin developers
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 project(univalue)
 
 option(UNIVALUE_BUILD_TESTS "Build univalue's unit tests" ON)