Index: libraries/osx/build-osx-libs.sh
===================================================================
--- libraries/osx/build-osx-libs.sh
+++ libraries/osx/build-osx-libs.sh
@@ -21,9 +21,9 @@
 # --------------------------------------------------------------
 # Library versions for ease of updating:
 ZLIB_VERSION="zlib-1.2.11"
-CURL_VERSION="curl-7.59.0"
-ICONV_VERSION="libiconv-1.15"
-XML2_VERSION="libxml2-2.9.8"
+CURL_VERSION="curl-7.71.0"
+ICONV_VERSION="libiconv-1.16"
+XML2_VERSION="libxml2-2.9.10"
 SDL2_VERSION="SDL2-2.0.5"
 # NOTE: remember to also update LIB_URL below when changing version
 BOOST_VERSION="boost_1_64_0"
@@ -31,20 +31,20 @@
 WXWIDGETS_VERSION="wxWidgets-3.0.3.1"
 # libpng was included as part of X11 but that's removed from Mountain Lion
 # (also the Snow Leopard version was ancient 1.2)
-PNG_VERSION="libpng-1.6.34"
-OGG_VERSION="libogg-1.3.3"
-VORBIS_VERSION="libvorbis-1.3.6"
+PNG_VERSION="libpng-1.6.36"
+OGG_VERSION="libogg-1.3.4"
+VORBIS_VERSION="libvorbis-1.3.7"
 # gloox requires GnuTLS, GnuTLS requires Nettle and GMP
-GMP_VERSION="gmp-6.1.2"
-NETTLE_VERSION="nettle-3.5.1"
+GMP_VERSION="gmp-6.2.0"
+NETTLE_VERSION="nettle-3.6"
 # NOTE: remember to also update LIB_URL below when changing version
+GLOOX_VERSION="gloox-1.0.24"
 GNUTLS_VERSION="gnutls-3.6.13"
-GLOOX_VERSION="gloox-1.0.22"
 # OS X only includes part of ICU, and only the dylib
 # NOTE: remember to also update LIB_URL below when changing version
-ICU_VERSION="icu4c-59_2"
-ENET_VERSION="enet-1.3.13"
-MINIUPNPC_VERSION="miniupnpc-2.0.20180222"
+ICU_VERSION="icu4c-67_1"
+ENET_VERSION="enet-1.3.17"
+MINIUPNPC_VERSION="miniupnpc-2.1"
 SODIUM_VERSION="libsodium-1.0.18"
 # --------------------------------------------------------------
 # Bundled with the game:
@@ -97,12 +97,11 @@
 fi
 # Force using libc++ since it has better C++11 support required by the game
 # but pre-Mavericks still use libstdc++ by default
-# Also enable c++0x for consistency with the game build
 C_FLAGS="$C_FLAGS -arch $ARCH -fvisibility=hidden"
 LDFLAGS="$LDFLAGS -arch $ARCH -stdlib=libc++"
 
 CFLAGS="$CFLAGS $C_FLAGS"
-CXXFLAGS="$CXXFLAGS $C_FLAGS -stdlib=libc++ -std=c++0x"
+CXXFLAGS="$CXXFLAGS $C_FLAGS -stdlib=libc++ -std=c++11"
 OBJCFLAGS="$OBJCFLAGS $C_FLAGS"
 OBJCXXFLAGS="$OBJCXXFLAGS $C_FLAGS"
 
@@ -762,7 +761,7 @@
 LIB_VERSION="${ICU_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION-src.tgz"
 LIB_DIRECTORY="icu"
-LIB_URL="https://github.com/unicode-org/icu/releases/download/release-59-2/"
+LIB_URL="https://github.com/unicode-org/icu/releases/download/release-67-1/"
 
 mkdir -p $LIB_DIRECTORY
 pushd icu > /dev/null
Index: libraries/osx/patches/gnutls-disable-tcpfastopen.diff
===================================================================
--- libraries/osx/patches/gnutls-disable-tcpfastopen.diff
+++ /dev/null
@@ -1,11 +0,0 @@
---- lib/system/fastopen.c	2019-03-15 05:10:27.000000000 -0400
-+++ lib/system/fastopen.c	2019-07-10 07:53:30.000000000 -0400
-@@ -38,7 +38,7 @@
- 
- /* TCP Fast Open on OSX behaves differently from Linux, so define these helpers */
- #if defined __APPLE__ && defined __MACH__ && defined CONNECT_DATA_IDEMPOTENT && defined CONNECT_RESUME_ON_READ_WRITE
--# define TCP_FASTOPEN_OSX
-+//# define TCP_FASTOPEN_OSX
- #elif defined TCP_FASTOPEN && defined MSG_FASTOPEN
- # define TCP_FASTOPEN_LINUX
- #endif