--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -123,17 +123,17 @@ crashtest:
             default: default
     chunks:
         by-test-platform:
             android-4.3-arm7-api-16/debug: 10
             android.*: 4
             default: 1
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            windows10-64/debug: both
             default: true
     mozharness:
         by-test-platform:
             android.*:
                 script: android_emulator_unittest.py
                 no-read-buildbot-config: true
                 config:
                     - android/androidarm_4_3.py
@@ -312,17 +312,17 @@ jsreftest:
             windows.*: 2
             linux64-ccov/.*: 5
             linux64-qr/.*: 4
             macosx.*: 2
             default: 3
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows7-32/debug: both
+            windows10-64/debug: both
             default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     mozharness:
         by-test-platform:
             android.*:
@@ -968,17 +968,17 @@ reftest:
             android.*: 16
             macosx64.*/opt: 1
             macosx64.*/debug: 2
             windows10-64.*/opt: 1
             windows10-64.*/debug: 2
             default: 8
     e10s:
         by-test-platform:
-            windows7-32/debug: both
+            windows10-64/debug: both
             default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
     mozharness:
         by-test-platform:
             android.*:
@@ -1057,17 +1057,17 @@ reftest-no-accel:
         by-test-platform:
             macosx.*: 1
             windows10-64.*/debug: 2
             windows10-64.*/opt: 1
             default: 8
     e10s:
         by-test-platform:
             linux64-jsdcov/opt: false
-            windows7-32/debug: both
+            windows10-64/debug: both
             default: true
     mozharness:
         script: desktop_unittest.py
         no-read-buildbot-config: true
         chunked:
             by-test-platform:
                 windows10-64.*/opt: false
                 macosx.*: false