--- a/browser/config/tooltool-manifests/win32/releng.manifest
+++ b/browser/config/tooltool-manifests/win32/releng.manifest
@@ -16,16 +16,16 @@
 {
 "size": 167175,
 "digest": "0b71a936edf5bd70cf274aaa5d7abc8f77fe8e7b5593a208f805cc9436fac646b9c4f0b43c2b10de63ff3da671497d35536077ecbc72dba7f8159a38b580f831",
 "algorithm": "sha512",
 "filename": "sccache.tar.bz2",
 "unpack": true
 },
 {
-"version": "Visual Studio 2015 Update 1 / SDK 10.0.10586.0",
-"size": 330570496,
-"digest": "0379fd087705f54aeb335449e6c623cd550b656d7110acafd1e5b315e1fc9272b7cdd1e37f99d575b16ecba4e8e4fe3af965967a3944c023b83caf68fa684888",
+"version": "Visual Studio 2015 Update 2 / SDK 10.0.10586.0/212",
+"size": 332343834,
+"digest": "55814aaabcd4aa51fe85918ec02a8c29bc067d41ee79ddcfd628daaba5a06d4241a73a51bf5a8bc69cc762b52551009f44b05e65682c45b4684c17fb2d017c2c",
 "algorithm": "sha512",
-"filename": "vs2015u1.zip",
+"filename": "vs2015u2.zip",
 "unpack": true
 }
 ]

--- a/browser/config/tooltool-manifests/win64/releng.manifest
+++ b/browser/config/tooltool-manifests/win64/releng.manifest
@@ -17,16 +17,16 @@
 {
 "size": 167175,
 "digest": "0b71a936edf5bd70cf274aaa5d7abc8f77fe8e7b5593a208f805cc9436fac646b9c4f0b43c2b10de63ff3da671497d35536077ecbc72dba7f8159a38b580f831",
 "algorithm": "sha512",
 "filename": "sccache.tar.bz2",
 "unpack": true
 },
 {
-"version": "Visual Studio 2015 Update 1 / SDK 10.0.10586.0",
-"size": 330570496,
-"digest": "0379fd087705f54aeb335449e6c623cd550b656d7110acafd1e5b315e1fc9272b7cdd1e37f99d575b16ecba4e8e4fe3af965967a3944c023b83caf68fa684888",
+"version": "Visual Studio 2015 Update 2 / SDK 10.0.10586.0/212",
+"size": 332343834,
+"digest": "55814aaabcd4aa51fe85918ec02a8c29bc067d41ee79ddcfd628daaba5a06d4241a73a51bf5a8bc69cc762b52551009f44b05e65682c45b4684c17fb2d017c2c",
 "algorithm": "sha512",
-"filename": "vs2015u1.zip",
+"filename": "vs2015u2.zip",
 "unpack": true
 }
 ]

--- a/build/docs/toolchains.rst
+++ b/build/docs/toolchains.rst
@@ -40,17 +40,17 @@ Next, install Visual Studio 2015 Communi
 found at https://www.visualstudio.com/en-us/products/visual-studio-community-vs.aspx.
 Be sure to follow these install instructions:
 
 1. Choose a ``Custom`` installation and click ``Next``
 2. Select ``Programming Languages`` -> ``Visual C++`` (make sure all sub items are
    selected)
 3. Under ``Windows and Web Development`` uncheck everything except
    ``Universal Windows App Development Tools`` and the items under it
-   (should be ``Tools (1.2)...`` and the ``Windows 10 SDK``).
+   (should be ``Tools (1.2.1)...`` and the ``Windows 10 SDK``).
 
 Once Visual Studio 2015 Community has been installed, from a checkout
 of mozilla-central, run something like the following to produce a ZIP
 archive::
 
    $ ./mach python build/windows_toolchain.py create-zip vs2015u2
 
 The produced archive will be the argument to ``create-zip`` + ``.zip``.

--- a/build/win32/mozconfig.vs2015-win64
+++ b/build/win32/mozconfig.vs2015-win64
@@ -1,11 +1,11 @@
 if [ -z "${VSPATH}" ]; then
     TOOLTOOL_DIR=${TOOLTOOL_DIR:-$topsrcdir}
-    VSPATH="$(cd ${TOOLTOOL_DIR} && pwd)/vs2015u1"
+    VSPATH="$(cd ${TOOLTOOL_DIR} && pwd)/vs2015u2"
 fi
 
 export WINDOWSSDKDIR="${VSPATH}/SDK"
 export WIN32_REDIST_DIR="${VSPATH}/VC/redist/x86/Microsoft.VC140.CRT"
 export WIN_UCRT_REDIST_DIR="${VSPATH}/SDK/Redist/ucrt/DLLs/x86"
 
 export PATH="${VSPATH}/VC/bin/amd64_x86:${VSPATH}/VC/bin/amd64:${VSPATH}/VC/bin:${VSPATH}/SDK/bin/x86:${VSPATH}/SDK/bin/x64:${VSPATH}/DIASDK/bin:${PATH}"
 export PATH="${VSPATH}/VC/redist/x86/Microsoft.VC140.CRT:${VSPATH}/VC/redist/x64/Microsoft.VC140.CRT:${VSPATH}/SDK/Redist/ucrt/DLLs/x86:${VSPATH}/SDK/Redist/ucrt/DLLs/x64:${PATH}"

--- a/build/win64/mozconfig.vs2015
+++ b/build/win64/mozconfig.vs2015
@@ -1,11 +1,11 @@
 if [ -z "${VSPATH}" ]; then
     TOOLTOOL_DIR=${TOOLTOOL_DIR:-$topsrcdir}
-    VSPATH="$(cd ${TOOLTOOL_DIR} && pwd)/vs2015u1"
+    VSPATH="$(cd ${TOOLTOOL_DIR} && pwd)/vs2015u2"
 fi
 
 export WINDOWSSDKDIR="${VSPATH}/SDK"
 export WIN32_REDIST_DIR=${VSPATH}/VC/redist/x64/Microsoft.VC140.CRT
 export WIN_UCRT_REDIST_DIR="${VSPATH}/SDK/Redist/ucrt/DLLs/x64"
 
 export PATH="${VSPATH}/VC/bin/amd64:${VSPATH}/VC/bin:${VSPATH}/SDK/bin/x64:${VSPATH}/VC/redist/x64/Microsoft.VC140.CRT:${VSPATH}/SDK/Redist/ucrt/DLLs/x64:${VSPATH}/DIASDK/bin/amd64:${PATH}"
 

--- a/js/src/devtools/automation/winbuildenv.sh
+++ b/js/src/devtools/automation/winbuildenv.sh
@@ -5,17 +5,17 @@ mk_add_options() {
   : do nothing
 }
 
 topsrcdir="$SOURCE"
 
 # Tooltool installs in parent of topsrcdir for spidermonkey builds.
 # Resolve that path since the mozconfigs assume tooltool installs in
 # topsrcdir.
-VSPATH="$(cd ${topsrcdir}/.. && pwd)/vs2015u1"
+VSPATH="$(cd ${topsrcdir}/.. && pwd)/vs2015u2"
 
 # When running on a developer machine, several variables will already
 # have the right settings and we will need to keep them since the
 # Windows mozconfigs overwrite them.
 export OLD_INCLUDE=$(IFS=';'; for d in $INCLUDE; do ( cd "$d" && echo -n $(pwd): ); done)
 export OLD_LIB=$(IFS=';'; for d in $LIB; do ( cd "$d" && echo -n $(pwd): ); done)
 export OLD_LIBPATH=$(IFS=';'; for d in $LIBPATH; do ( cd "$d" && echo -n $(pwd): ); done)