diff --git a/CMakeLists.txt b/CMakeLists.txt
index 924e8ccd0..e5f0d33b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ include(GNUInstallDirs)
 include(FeatureSummary)
 
 # version requirements
-set(requiredBoostVersion 1.35)
+set(requiredBoostVersion 1.40)
 set(requiredQtVersion 5.9.0)
 set(requiredOpensslVersion 1.0)
 set(requiredLibtorrentVersion 1.1.10)
diff --git a/INSTALL b/INSTALL
index d5ad61289..f4967b8f1 100644
--- a/INSTALL
+++ b/INSTALL
@@ -3,7 +3,7 @@ qBittorrent - A BitTorrent client in C++ / Qt
 
 1) Install these dependencies:
 
-  - Boost >= 1.35
+  - Boost >= 1.40
 
   - libtorrent-rasterbar >= 1.1.10 (by Arvid Norberg)
       * https://www.libtorrent.org/
diff --git a/cmake/Modules/winconf.cmake b/cmake/Modules/winconf.cmake
index 7e178c123..757d84e31 100644
--- a/cmake/Modules/winconf.cmake
+++ b/cmake/Modules/winconf.cmake
@@ -6,7 +6,6 @@ list(APPEND CMAKE_LIBRARY_PATH "$ENV{LIB}")
 # libtorrent
 set(LibtorrentRasterbar_USE_STATIC_LIBS True)
 set(LibtorrentRasterbar_CUSTOM_DEFINITIONS
-    -DBOOST_ALL_NO_LIB -DBOOST_ASIO_HASH_MAP_BUCKETS=1021
     -DBOOST_EXCEPTION_DISABLE
     -DBOOST_SYSTEM_STATIC_LINK=1
     -DTORRENT_USE_OPENSSL
diff --git a/configure b/configure
index 9cae4c479..51d876e22 100755
--- a/configure
+++ b/configure
@@ -4729,10 +4729,10 @@ BOOST_CPPFLAGS=""
 if test "x$want_boost" = "xyes"; then :
 
 
-  if test "x1.35" = "x"; then :
+  if test "x1.40" = "x"; then :
   _AX_BOOST_BASE_TONUMERICVERSION_req="1.20.0"
 else
-  _AX_BOOST_BASE_TONUMERICVERSION_req="1.35"
+  _AX_BOOST_BASE_TONUMERICVERSION_req="1.40"
 fi
   _AX_BOOST_BASE_TONUMERICVERSION_req_shorten=`expr $_AX_BOOST_BASE_TONUMERICVERSION_req : '\([0-9]*\.[0-9]*\)'`
   _AX_BOOST_BASE_TONUMERICVERSION_req_major=`expr $_AX_BOOST_BASE_TONUMERICVERSION_req : '\([0-9]*\)'`
@@ -4774,16 +4774,16 @@ esac
 
                 if test "x$_AX_BOOST_BASE_boost_path" != "x"; then :
 
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.35 ($WANT_BOOST_VERSION) includes in \"$_AX_BOOST_BASE_boost_path/include\"" >&5
-$as_echo_n "checking for boostlib >= 1.35 ($WANT_BOOST_VERSION) includes in \"$_AX_BOOST_BASE_boost_path/include\"... " >&6; }
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.40 ($WANT_BOOST_VERSION) includes in \"$_AX_BOOST_BASE_boost_path/include\"" >&5
+$as_echo_n "checking for boostlib >= 1.40 ($WANT_BOOST_VERSION) includes in \"$_AX_BOOST_BASE_boost_path/include\"... " >&6; }
          if test -d "$_AX_BOOST_BASE_boost_path/include" && test -r "$_AX_BOOST_BASE_boost_path/include"; then :
 
            { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
            BOOST_CPPFLAGS="-I$_AX_BOOST_BASE_boost_path/include"
            for _AX_BOOST_BASE_boost_path_tmp in $multiarch_libsubdir $libsubdirs; do
-                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.35 ($WANT_BOOST_VERSION) lib path in \"$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp\"" >&5
-$as_echo_n "checking for boostlib >= 1.35 ($WANT_BOOST_VERSION) lib path in \"$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp\"... " >&6; }
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.40 ($WANT_BOOST_VERSION) lib path in \"$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp\"" >&5
+$as_echo_n "checking for boostlib >= 1.40 ($WANT_BOOST_VERSION) lib path in \"$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp\"... " >&6; }
                 if test -d "$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp" && test -r "$_AX_BOOST_BASE_boost_path/$_AX_BOOST_BASE_boost_path_tmp" ; then :
 
                         { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
@@ -4826,8 +4826,8 @@ fi
   BOOST_LDFLAGS="-L$_AX_BOOST_BASE_boost_lib_path"
 fi
 
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.35 ($WANT_BOOST_VERSION)" >&5
-$as_echo_n "checking for boostlib >= 1.35 ($WANT_BOOST_VERSION)... " >&6; }
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for boostlib >= 1.40 ($WANT_BOOST_VERSION)" >&5
+$as_echo_n "checking for boostlib >= 1.40 ($WANT_BOOST_VERSION)... " >&6; }
     CPPFLAGS_SAVED="$CPPFLAGS"
     CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
     export CPPFLAGS
@@ -4996,8 +4996,8 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
     if test "x$succeeded" != "xyes" ; then
         if test "x$_version" = "x0" ; then
-            { $as_echo "$as_me:${as_lineno-$LINENO}: We could not detect the boost libraries (version 1.35 or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation." >&5
-$as_echo "$as_me: We could not detect the boost libraries (version 1.35 or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation." >&6;}
+            { $as_echo "$as_me:${as_lineno-$LINENO}: We could not detect the boost libraries (version 1.40 or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation." >&5
+$as_echo "$as_me: We could not detect the boost libraries (version 1.40 or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation." >&6;}
         else
             { $as_echo "$as_me:${as_lineno-$LINENO}: Your boost libraries seems to old (version $_version)." >&5
 $as_echo "$as_me: Your boost libraries seems to old (version $_version)." >&6;}
diff --git a/configure.ac b/configure.ac
index ffd046f6d..098be1546 100644
--- a/configure.ac
+++ b/configure.ac
@@ -163,7 +163,7 @@ AS_CASE(["x$enable_qt_dbus"],
         AC_MSG_ERROR([Unknown option "$enable_qt_dbus". Use either "yes" or "no".])])
 
 
-AX_BOOST_BASE([1.35],
+AX_BOOST_BASE([1.40],
               [AC_MSG_NOTICE([Boost CXXFLAGS: "$BOOST_CPPFLAGS"])
                AC_MSG_NOTICE([Boost LDFLAGS: "$BOOST_LDFLAGS"])],
               [AC_MSG_ERROR([Could not find Boost])])
diff --git a/winconf.pri b/winconf.pri
index 6db3ef61f..dd5dfe318 100644
--- a/winconf.pri
+++ b/winconf.pri
@@ -1,4 +1,3 @@
-DEFINES += BOOST_ASIO_HASH_MAP_BUCKETS=1021
 # After 1.55 some Windows users reported regular UI freezes.
 # This makes ASIO use the pre-1.56 way of doing things. See issue #2003
 DEFINES += BOOST_ASIO_DISABLE_CONNECTEX