diff --git a/.github/config/evergreen-arm-hardfp.json b/.github/config/evergreen-arm-hardfp.json
index 113fd11ab46..1be38f06260 100644
--- a/.github/config/evergreen-arm-hardfp.json
+++ b/.github/config/evergreen-arm-hardfp.json
@@ -13,8 +13,6 @@
   },
   "platforms": [
     "evergreen-arm-hardfp",
-    "evergreen-arm-hardfp-sbversion-15",
-    "evergreen-arm-hardfp-sbversion-16",
     "evergreen-arm-hardfp-sbversion-17"
   ],
   "includes": [
@@ -27,24 +25,6 @@
       "evergreen_loader_extra_gn_arguments": "use_asan=false is_clang=false",
       "dimension": "release_version=regex:10.*"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"evergreen-arm-hardfp-sbversion-15",
-      "target_platform":"evergreen-arm-hardfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "evergreen_loader_extra_gn_arguments":"use_asan=false is_clang=false",
-      "sb_api_version": "15"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"evergreen-arm-hardfp-sbversion-16",
-      "target_platform":"evergreen-arm-hardfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "evergreen_loader_extra_gn_arguments":"use_asan=false is_clang=false",
-      "sb_api_version": "16"
-    },
     {
       "name":"sbversion-17",
       "platform":"evergreen-arm-hardfp-sbversion-17",
diff --git a/.github/config/evergreen-arm-softfp.json b/.github/config/evergreen-arm-softfp.json
index 0594f2d36bf..104809b1983 100644
--- a/.github/config/evergreen-arm-softfp.json
+++ b/.github/config/evergreen-arm-softfp.json
@@ -13,8 +13,6 @@
   },
   "platforms": [
     "evergreen-arm-softfp",
-    "evergreen-arm-softfp-sbversion-15",
-    "evergreen-arm-softfp-sbversion-16",
     "evergreen-arm-softfp-sbversion-17"
   ],
   "includes": [
@@ -26,24 +24,6 @@
       "extra_gn_arguments":"use_asan=false",
       "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"evergreen-arm-softfp-sbversion-15",
-      "target_platform":"evergreen-arm-softfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"15",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"evergreen-arm-softfp-sbversion-16",
-      "target_platform":"evergreen-arm-softfp",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"16",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
     {
       "name":"sbversion-17",
       "platform":"evergreen-arm-softfp-sbversion-17",
diff --git a/.github/config/evergreen-arm64.json b/.github/config/evergreen-arm64.json
index 981f77a45a6..e11fb6f4105 100644
--- a/.github/config/evergreen-arm64.json
+++ b/.github/config/evergreen-arm64.json
@@ -3,8 +3,6 @@
   "evergreen_loader": "android-arm64",
   "platforms": [
     "evergreen-arm64",
-    "evergreen-arm64-sbversion-15",
-    "evergreen-arm64-sbversion-16",
     "evergreen-arm64-sbversion-17"
   ],
   "includes": [
@@ -16,24 +14,6 @@
       "extra_gn_arguments":"use_asan=false",
       "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"evergreen-arm64-sbversion-15",
-      "target_platform":"evergreen-arm64",
-      "target_cpu":"target_cpu=\\\"arm64\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"15",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"evergreen-arm64-sbversion-16",
-      "target_platform":"evergreen-arm64",
-      "target_cpu":"target_cpu=\\\"arm64\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"16",
-      "evergreen_loader_extra_gn_arguments": "target_os=\\\"android\\\" sb_is_evergreen_compatible=true"
-    },
     {
       "name":"sbversion-17",
       "platform":"evergreen-arm64-sbversion-17",
diff --git a/.github/config/evergreen-x64.json b/.github/config/evergreen-x64.json
index 21bc0e71397..e8b3bb2bc39 100644
--- a/.github/config/evergreen-x64.json
+++ b/.github/config/evergreen-x64.json
@@ -5,8 +5,6 @@
   "on_host_test_shards": ["0", "1", "2", "3", "blackbox", "wpt", "evergreen"],
   "platforms": [
     "evergreen-x64",
-    "evergreen-x64-sbversion-15",
-    "evergreen-x64-sbversion-16",
     "evergreen-x64-sbversion-17"
   ],
   "includes": [
@@ -17,22 +15,6 @@
       "target_cpu":"target_cpu=\\\"x64\\\"",
       "extra_gn_arguments":"use_asan=false"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"evergreen-x64-sbversion-15",
-      "target_platform":"evergreen-x64",
-      "target_cpu":"target_cpu=\\\"x64\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"15"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"evergreen-x64-sbversion-16",
-      "target_platform":"evergreen-x64",
-      "target_cpu":"target_cpu=\\\"x64\\\"",
-      "extra_gn_arguments":"use_asan=false",
-      "sb_api_version":"16"
-    },
     {
       "name":"sbversion-17",
       "platform":"evergreen-x64-sbversion-17",
diff --git a/.github/config/linux.json b/.github/config/linux.json
index 4f591b03479..3c2b325eaa4 100644
--- a/.github/config/linux.json
+++ b/.github/config/linux.json
@@ -7,8 +7,6 @@
     "linux-x64x11",
     "linux-x64x11-egl",
     "linux-x64x11-skia",
-    "linux-x64x11-sbversion-15",
-    "linux-x64x11-sbversion-16",
     "linux-x64x11-sbversion-17"
   ],
   "includes": [
@@ -27,18 +25,6 @@
       "platform":"linux-x64x11-skia",
       "target_platform":"linux-x64x11-skia"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"linux-x64x11-sbversion-15",
-      "target_platform":"linux-x64x11",
-      "sb_api_version":"15"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"linux-x64x11-sbversion-16",
-      "target_platform":"linux-x64x11",
-      "sb_api_version":"16"
-    },
     {
       "name":"sbversion-17",
       "platform":"linux-x64x11-sbversion-17",
diff --git a/.github/config/raspi-2.json b/.github/config/raspi-2.json
index 1df9213251b..f5b89732987 100644
--- a/.github/config/raspi-2.json
+++ b/.github/config/raspi-2.json
@@ -13,8 +13,6 @@
   },
   "platforms": [
     "raspi-2",
-    "raspi-2-sbversion-15",
-    "raspi-2-sbversion-16",
     "raspi-2-sbversion-17"
   ],
   "includes": [
@@ -25,22 +23,6 @@
       "target_cpu":"target_cpu=\\\"arm\\\"",
       "extra_gn_arguments": "build_with_separate_cobalt_toolchain=true use_asan=false"
     },
-    {
-      "name":"sbversion-15",
-      "platform":"raspi-2-sbversion-15",
-      "target_platform":"raspi-2",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments": "build_with_separate_cobalt_toolchain=true use_asan=false",
-      "sb_api_version": "15"
-    },
-    {
-      "name":"sbversion-16",
-      "platform":"raspi-2-sbversion-16",
-      "target_platform":"raspi-2",
-      "target_cpu":"target_cpu=\\\"arm\\\"",
-      "extra_gn_arguments": "build_with_separate_cobalt_toolchain=true use_asan=false",
-      "sb_api_version": "16"
-    },
     {
       "name":"sbversion-17",
       "platform":"raspi-2-sbversion-17",