diff --git a/taskcluster/.shared.yml b/taskcluster/.shared.yml
index 00e2346c..765ad3a0 100644
--- a/taskcluster/.shared.yml
+++ b/taskcluster/.shared.yml
@@ -65,8 +65,8 @@ nodejs:
     prep_14: '/usr/bin/wget.exe https://nodejs.org/dist/v14.3.0/node-v14.3.0-win-x64.zip && ""C:\Program Files\7-zip\7z.exe"" x -o$TASKCLUSTER_NODE_DIR -tzip -aoa node-v14.3.0-win-x64.zip && rm node-*.zip && export PATH=$TASKCLUSTER_TASK_DIR/bin/node-v14.3.0-win-x64/:$PATH'
 system:
   node_gyp_cache:
-    url: 'https://community-tc.services.mozilla.com/api/index/v1/task/project.deepspeech.node-gyp-cache.6/artifacts/public/node-gyp-cache.tar.gz'
-    namespace: 'project.deepspeech.node-gyp-cache.6'
+    url: 'https://community-tc.services.mozilla.com/api/index/v1/task/project.deepspeech.node-gyp-cache.7/artifacts/public/node-gyp-cache.tar.gz'
+    namespace: 'project.deepspeech.node-gyp-cache.7'
   homebrew_builds:
     url: 'https://community-tc.services.mozilla.com/api/index/v1/task/project.deepspeech.homebrew_builds.7/artifacts/public/homebrew_builds.tar.gz'
     namespace: 'project.deepspeech.homebrew_builds.7'
diff --git a/taskcluster/tc-all-vars.sh b/taskcluster/tc-all-vars.sh
index 0fae9d3c..f2281faf 100755
--- a/taskcluster/tc-all-vars.sh
+++ b/taskcluster/tc-all-vars.sh
@@ -89,4 +89,4 @@ SUPPORTED_PYTHON_VERSIONS=${SUPPORTED_PYTHON_VERSIONS:-3.5.8:ucs2 3.6.10:ucs2 3.
 SUPPORTED_NODEJS_BUILD_VERSIONS=${SUPPORTED_NODEJS_BUILD_VERSIONS:-10.0.0 11.0.0 12.7.0 13.0.0 14.0.0}
 SUPPORTED_NODEJS_TESTS_VERSIONS=${SUPPORTED_NODEJS_TESTS_VERSIONS:-10.20.1 11.15.0 12.17.0 13.14.0 14.3.0}
 
-SUPPORTED_ELECTRONJS_VERSIONS=${SUPPORTED_ELECTRONJS_VERSIONS:-5.0.13 6.0.12 6.1.7 7.0.1 7.1.8 8.0.1 9.0.1}
+SUPPORTED_ELECTRONJS_VERSIONS=${SUPPORTED_ELECTRONJS_VERSIONS:-5.0.13 6.0.12 6.1.7 7.0.1 7.1.8 8.0.1 9.0.1 9.1.0}
diff --git a/taskcluster/test-electronjs_v9.1-darwin-amd64-opt.yml b/taskcluster/test-electronjs_v9.1-darwin-amd64-opt.yml
new file mode 100644
index 00000000..3a1a7b29
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1-darwin-amd64-opt.yml
@@ -0,0 +1,15 @@
+build:
+  template_file: test-darwin-opt-base.tyml
+  dependencies:
+    - "darwin-amd64-cpu-opt"
+    - "test-training_16k-linux-amd64-py36m-opt"
+    - "homebrew_tests-darwin-amd64"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${nodejs.brew.prep_12}
+  args:
+    tests_cmdline: "$TASKCLUSTER_TASK_DIR/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 16k"
+  metadata:
+    name: "DeepSpeech OSX AMD64 CPU ElectronJS v9.1 tests"
+    description: "Testing DeepSpeech for OSX/AMD64 on ElectronJS v9.1, CPU only, optimized version"
diff --git a/taskcluster/test-electronjs_v9.1-win-amd64-opt.yml b/taskcluster/test-electronjs_v9.1-win-amd64-opt.yml
new file mode 100644
index 00000000..be83c3b3
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1-win-amd64-opt.yml
@@ -0,0 +1,14 @@
+build:
+  template_file: test-win-opt-base.tyml
+  dependencies:
+    - "win-amd64-cpu-opt"
+    - "test-training_16k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${system.sox_win} && ${nodejs.win.prep_12}
+  args:
+    tests_cmdline: "${system.homedir.win}/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 16k"
+  metadata:
+    name: "DeepSpeech Windows AMD64 CPU ElectronJS v9.1 tests"
+    description: "Testing DeepSpeech for Windows/AMD64 on ElectronJS v9.1, CPU only, optimized version"
diff --git a/taskcluster/test-electronjs_v9.1_16k-linux-amd64-opt.yml b/taskcluster/test-electronjs_v9.1_16k-linux-amd64-opt.yml
new file mode 100644
index 00000000..fdc01dc6
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1_16k-linux-amd64-opt.yml
@@ -0,0 +1,15 @@
+build:
+  template_file: test-linux-opt-base.tyml
+  docker_image: "ubuntu:16.04"
+  dependencies:
+    - "linux-amd64-cpu-opt"
+    - "test-training_16k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${nodejs.packages_xenial.prep_12} && ${nodejs.packages_xenial.apt_pinning} && apt-get -qq update && apt-get -qq -y install ${nodejs.packages_xenial.apt} ${electronjs.packages_xenial.apt}
+  args:
+    tests_cmdline: "${system.homedir.linux}/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 16k"
+  metadata:
+    name: "DeepSpeech Linux AMD64 CPU ElectronJS v9.1 tests (16kHz)"
+    description: "Testing DeepSpeech for Linux/AMD64 on ElectronJS v9.1, CPU only, optimized version (16kHz)"
diff --git a/taskcluster/test-electronjs_v9.1_8k-linux-amd64-opt.yml b/taskcluster/test-electronjs_v9.1_8k-linux-amd64-opt.yml
new file mode 100644
index 00000000..c8684c3a
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1_8k-linux-amd64-opt.yml
@@ -0,0 +1,15 @@
+build:
+  template_file: test-linux-opt-base.tyml
+  docker_image: "ubuntu:16.04"
+  dependencies:
+    - "linux-amd64-cpu-opt"
+    - "test-training_8k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_8k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${nodejs.packages_xenial.prep_12} && ${nodejs.packages_xenial.apt_pinning} && apt-get -qq update && apt-get -qq -y install ${nodejs.packages_xenial.apt} ${electronjs.packages_xenial.apt}
+  args:
+    tests_cmdline: "${system.homedir.linux}/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 8k"
+  metadata:
+    name: "DeepSpeech Linux AMD64 CPU ElectronJS v9.1 tests (8kHz)"
+    description: "Testing DeepSpeech for Linux/AMD64 on ElectronJS v9.1, CPU only, optimized version (8kHz)"
diff --git a/taskcluster/test-electronjs_v9.1_multiarchpkg-win-amd64-opt.yml b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-amd64-opt.yml
new file mode 100644
index 00000000..3a547a7f
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-amd64-opt.yml
@@ -0,0 +1,14 @@
+build:
+  template_file: test-win-opt-base.tyml
+  dependencies:
+    - "node-package-cpu"
+    - "test-training_16k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${system.sox_win} && ${nodejs.win.prep_12}
+  args:
+    tests_cmdline: "${system.homedir.win}/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 16k"
+  metadata:
+    name: "DeepSpeech Windows AMD64 CPU ElectronJS MultiArch Package v9.1 tests"
+    description: "Testing DeepSpeech for Windows/AMD64 on ElectronJS MultiArch Package v9.1, CPU only, optimized version"
diff --git a/taskcluster/test-electronjs_v9.1_multiarchpkg-win-cuda-opt.yml b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-cuda-opt.yml
new file mode 100644
index 00000000..e9ab02da
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-cuda-opt.yml
@@ -0,0 +1,14 @@
+build:
+  template_file: test-win-cuda-opt-base.tyml
+  dependencies:
+    - "node-package-gpu"
+    - "test-training_16k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${system.sox_win} && ${nodejs.win.prep_12}
+  args:
+    tests_cmdline: "${system.homedir.win}/DeepSpeech/ds/taskcluster/tc-electron-tests.sh 12.x 9.0.1 16k cuda"
+  metadata:
+    name: "DeepSpeech Windows AMD64 CUDA ElectronJS MultiArch Package v9.1 tests"
+    description: "Testing DeepSpeech for Windows/AMD64 on ElectronJS MultiArch Package v9.1, CUDA, optimized version"
diff --git a/taskcluster/test-electronjs_v9.1_multiarchpkg-win-tflite-opt.yml b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-tflite-opt.yml
new file mode 100644
index 00000000..e2521f4b
--- /dev/null
+++ b/taskcluster/test-electronjs_v9.1_multiarchpkg-win-tflite-opt.yml
@@ -0,0 +1,14 @@
+build:
+  template_file: test-win-opt-base.tyml
+  dependencies:
+    - "node-package-tflite"
+    - "test-training_16k-linux-amd64-py36m-opt"
+  test_model_task: "test-training_16k-linux-amd64-py36m-opt"
+  system_setup:
+    >
+      ${system.sox_win} && ${nodejs.win.prep_12}
+  args:
+    tests_cmdline: "${system.homedir.win}/DeepSpeech/ds/taskcluster/tc-electron_tflite-tests.sh 12.x 9.0.1 16k"
+  metadata:
+    name: "DeepSpeech Windows AMD64 TFLite ElectronJS MultiArch Package v9.1 tests"
+    description: "Testing DeepSpeech for Windows/AMD64 on ElectronJS MultiArch Package v9.1, TFLite only, optimized version"