diff --git a/examples/fdc3-chart-and-grid/js-datagrid/package.json b/examples/fdc3-chart-and-grid/js-datagrid/package.json
index ccbfbac3c..748f4b437 100644
--- a/examples/fdc3-chart-and-grid/js-datagrid/package.json
+++ b/examples/fdc3-chart-and-grid/js-datagrid/package.json
@@ -13,7 +13,7 @@
     "@angular/animations": "21.1.5",
     "@angular/cdk": "21.1.5",
     "@angular/common": "21.1.5",
-    "@angular/compiler": "21.1.5",
+    "@angular/compiler": "20.3.18",
     "@angular/core": "21.1.5",
     "@angular/flex-layout": "^15.0.0-beta.42",
     "@angular/forms": "21.1.5",
diff --git a/examples/fdc3-trade-simulator/js-order-book/package.json b/examples/fdc3-trade-simulator/js-order-book/package.json
index cf47457ab..99fffbf4d 100644
--- a/examples/fdc3-trade-simulator/js-order-book/package.json
+++ b/examples/fdc3-trade-simulator/js-order-book/package.json
@@ -12,7 +12,7 @@
   "dependencies": {
     "@angular/animations": "21.1.5",
     "@angular/common": "^21.1.5",
-    "@angular/compiler": "^21.1.5",
+    "@angular/compiler": "^20.3.18",
     "@angular/core": "^21.1.5",
     "@angular/forms": "^21.1.5",
     "@angular/material": "21.1.5",
diff --git a/examples/fdc3-trade-simulator/js-trader-app/package.json b/examples/fdc3-trade-simulator/js-trader-app/package.json
index d948a18d6..e1077911f 100644
--- a/examples/fdc3-trade-simulator/js-trader-app/package.json
+++ b/examples/fdc3-trade-simulator/js-trader-app/package.json
@@ -13,7 +13,7 @@
     "@angular/animations": "21.1.5",
     "@angular/cdk": "^21.1.5",
     "@angular/common": "^21.1.5",
-    "@angular/compiler": "^21.1.5",
+    "@angular/compiler": "^20.3.18",
     "@angular/core": "^21.1.5",
     "@angular/forms": "^21.1.5",
     "@angular/material": "21.1.5",
diff --git a/examples/js-chart-and-grid-messagerouter/js-datagrid/package.json b/examples/js-chart-and-grid-messagerouter/js-datagrid/package.json
index caab6cc5c..23a32571e 100644
--- a/examples/js-chart-and-grid-messagerouter/js-datagrid/package.json
+++ b/examples/js-chart-and-grid-messagerouter/js-datagrid/package.json
@@ -13,7 +13,7 @@
     "@angular/animations": "21.1.5",
     "@angular/cdk": "21.1.5",
     "@angular/common": "21.1.5",
-    "@angular/compiler": "21.1.5",
+    "@angular/compiler": "20.3.18",
     "@angular/core": "21.1.5",
     "@angular/flex-layout": "^15.0.0-beta.42",
     "@angular/forms": "21.1.5",
diff --git a/package-lock.json b/package-lock.json
index aa3998032..7aeb87635 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,7 +43,7 @@
         "@angular/animations": "21.1.5",
         "@angular/cdk": "21.1.5",
         "@angular/common": "21.1.5",
-        "@angular/compiler": "21.1.5",
+        "@angular/compiler": "^20.3.18",
         "@angular/core": "21.1.5",
         "@angular/flex-layout": "^15.0.0-beta.42",
         "@angular/forms": "21.1.5",
@@ -71,6 +71,18 @@
         "typescript": "5.9.3"
       }
     },
+    "examples/fdc3-chart-and-grid/js-datagrid/node_modules/@angular/compiler": {
+      "version": "20.3.18",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.18.tgz",
+      "integrity": "sha512-AaP/LCiDNcYmF135EEozjyR04NRBT38ZfBHQwjhgwiBBTejmvcpHwJaHSkraLpZqZzE4BQqqmgiQ1EJqxEwLVA==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "examples/fdc3-chart-and-grid/js-datagrid/node_modules/@finos/fdc3": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/@finos/fdc3/-/fdc3-2.0.3.tgz",
@@ -131,7 +143,7 @@
       "dependencies": {
         "@angular/animations": "21.1.5",
         "@angular/common": "^21.1.5",
-        "@angular/compiler": "^21.1.5",
+        "@angular/compiler": "^20.3.18",
         "@angular/core": "^21.1.5",
         "@angular/forms": "^21.1.5",
         "@angular/material": "21.1.5",
@@ -157,6 +169,18 @@
         "typescript": "~5.9.3"
       }
     },
+    "examples/fdc3-trade-simulator/js-order-book/node_modules/@angular/compiler": {
+      "version": "20.3.18",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.18.tgz",
+      "integrity": "sha512-AaP/LCiDNcYmF135EEozjyR04NRBT38ZfBHQwjhgwiBBTejmvcpHwJaHSkraLpZqZzE4BQqqmgiQ1EJqxEwLVA==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "examples/fdc3-trade-simulator/js-order-book/node_modules/@finos/fdc3": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/@finos/fdc3/-/fdc3-2.0.3.tgz",
@@ -170,7 +194,7 @@
         "@angular/animations": "21.1.5",
         "@angular/cdk": "^21.1.5",
         "@angular/common": "^21.1.5",
-        "@angular/compiler": "^21.1.5",
+        "@angular/compiler": "^20.3.18",
         "@angular/core": "^21.1.5",
         "@angular/forms": "^21.1.5",
         "@angular/material": "21.1.5",
@@ -196,6 +220,18 @@
         "typescript": "~5.9.3"
       }
     },
+    "examples/fdc3-trade-simulator/js-trader-app/node_modules/@angular/compiler": {
+      "version": "20.3.18",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.18.tgz",
+      "integrity": "sha512-AaP/LCiDNcYmF135EEozjyR04NRBT38ZfBHQwjhgwiBBTejmvcpHwJaHSkraLpZqZzE4BQqqmgiQ1EJqxEwLVA==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "examples/js-chart-and-grid-messagerouter/js-chart": {
       "name": "@morgan-stanley/composeui-example-chart-messagerouter",
       "version": "0.1.0-alpha.12",
@@ -221,7 +257,7 @@
         "@angular/animations": "21.1.5",
         "@angular/cdk": "21.1.5",
         "@angular/common": "21.1.5",
-        "@angular/compiler": "21.1.5",
+        "@angular/compiler": "^20.3.18",
         "@angular/core": "21.1.5",
         "@angular/flex-layout": "^15.0.0-beta.42",
         "@angular/forms": "21.1.5",
@@ -248,6 +284,18 @@
         "typescript": "5.9.3"
       }
     },
+    "examples/js-chart-and-grid-messagerouter/js-datagrid/node_modules/@angular/compiler": {
+      "version": "20.3.18",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.18.tgz",
+      "integrity": "sha512-AaP/LCiDNcYmF135EEozjyR04NRBT38ZfBHQwjhgwiBBTejmvcpHwJaHSkraLpZqZzE4BQqqmgiQ1EJqxEwLVA==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "node_modules/@acemir/cssom": {
       "version": "0.9.31",
       "resolved": "https://registry.npmjs.org/@acemir/cssom/-/cssom-0.9.31.tgz",
@@ -1286,6 +1334,7 @@
       "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-21.1.5.tgz",
       "integrity": "sha512-yRUdWlL+AWcTL4d7zD0jkNqsjvxXpWEihvOfD2gc65DO0+E80DsWIpHq9A8yWeLukbfLcmBGI2QbfW9+SXAlvg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "tslib": "^2.3.0"
       },
@@ -26651,7 +26700,7 @@
         "@angular/animations": "^20.3.15",
         "@angular/cdk": "^20.2.14",
         "@angular/common": "^20.3.15",
-        "@angular/compiler": "^20.3.15",
+        "@angular/compiler": "^20.3.18",
         "@angular/core": "^20.3.15",
         "@angular/forms": "^20.3.15",
         "@angular/material": "^20.2.14",
@@ -27133,9 +27182,9 @@
       }
     },
     "prototypes/process-explorer/oss-frontend/node_modules/@angular/compiler": {
-      "version": "20.3.16",
-      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.16.tgz",
-      "integrity": "sha512-Pt9Ms9GwTThgzdxWBwMfN8cH1JEtQ2DK5dc2yxYtPSaD+WKmG9AVL1PrzIYQEbaKcWk2jxASUHpEWSlNiwo8uw==",
+      "version": "20.3.18",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-20.3.18.tgz",
+      "integrity": "sha512-AaP/LCiDNcYmF135EEozjyR04NRBT38ZfBHQwjhgwiBBTejmvcpHwJaHSkraLpZqZzE4BQqqmgiQ1EJqxEwLVA==",
       "license": "MIT",
       "dependencies": {
         "tslib": "^2.3.0"
@@ -29222,7 +29271,7 @@
         "@types/node": "^24.5.2",
         "@vitest/coverage-v8": "4.0.18",
         "rollup": "4.60.1",
-        "rollup-plugin-dts": "^6.4.1",
+        "rollup-plugin-dts": "6.4.1",
         "typescript": "5.9.3",
         "vitest": "4.0.18"
       }
@@ -29246,7 +29295,7 @@
         "jest-extended": "7.0.0",
         "rimraf": "6.1.3",
         "rollup": "4.60.1",
-        "rollup-plugin-dts": "^6.4.1",
+        "rollup-plugin-dts": "6.4.1",
         "ts-jest": "29.4.6",
         "tslib": "2.8.1",
         "typescript": "5.9.3"
diff --git a/prototypes/process-explorer/oss-frontend/package.json b/prototypes/process-explorer/oss-frontend/package.json
index 64afaa59f..229172d91 100644
--- a/prototypes/process-explorer/oss-frontend/package.json
+++ b/prototypes/process-explorer/oss-frontend/package.json
@@ -15,7 +15,7 @@
     "@angular/animations": "^20.3.15",
     "@angular/cdk": "^20.2.14",
     "@angular/common": "^20.3.15",
-    "@angular/compiler": "^20.3.15",
+    "@angular/compiler": "^20.3.18",
     "@angular/core": "^20.3.15",
     "@angular/forms": "^20.3.15",
     "@angular/material": "^20.2.14",
@@ -26,8 +26,8 @@
     "@types/google-protobuf": "^3.15.12",
     "google-protobuf": "^4.0.2",
     "material-icons": "^1.13.10",
-    "ts-protoc-gen": "^0.15.0",
     "rxjs": "^7.8.0",
+    "ts-protoc-gen": "^0.15.0",
     "tslib": "^2.3.0"
   },
   "devDependencies": {