diff --git a/packages/monorepo/src/projects/typescript/monorepo-ts.ts b/packages/monorepo/src/projects/typescript/monorepo-ts.ts
index 3aac34f73..686c892d8 100644
--- a/packages/monorepo/src/projects/typescript/monorepo-ts.ts
+++ b/packages/monorepo/src/projects/typescript/monorepo-ts.ts
@@ -171,6 +171,9 @@ export class MonorepoTsProject
         },
         include: ["**/*.ts", ".projenrc.ts"],
       },
+      peerDeps: [...(options.peerDeps || []), "nx@^16"],
+      devDeps: [...(options.devDeps || []), "nx@^16", "@aws/pdk@^0"],
+      deps: [...(options.deps || []), "aws-cdk-lib", "constructs", "cdk-nag"],
     });
 
     this.nxConfigurator = new NxConfigurator(this, {
@@ -201,6 +204,12 @@ export class MonorepoTsProject
         );
         break;
       }
+      case NodePackageManager.NPM: {
+        // Allow older versions of peer deps to resolv compatibility issues
+        this.tasks.tryFind("install")?.reset("npm install --legacy-peer-deps");
+        this.tasks.tryFind("install:ci")?.reset("npm ci --legacy-peer-deps");
+        break;
+      }
     }
 
     this.workspaceConfig = options.workspaceConfig;
@@ -272,10 +281,6 @@ export class MonorepoTsProject
       });
     }
 
-    // Add dependency on nx 16
-    this.addPeerDeps("nx@^16");
-    this.addDevDeps("nx@^16", "@aws/pdk@^0");
-    this.addDeps("aws-cdk-lib", "constructs", "cdk-nag"); // Needed as this can be bundled in @aws/pdk
     this.package.addPackageResolutions(
       "@types/babel__traverse@7.18.2",
       "wrap-ansi@^7.0.0",
diff --git a/packages/pdk/_scripts/exec-command.js b/packages/pdk/_scripts/exec-command.js
index 96796b620..653ce4bf7 100755
--- a/packages/pdk/_scripts/exec-command.js
+++ b/packages/pdk/_scripts/exec-command.js
@@ -27,8 +27,8 @@ const engines = JSON.parse(
 ).engines;
 
 if (engines) {
-  const pkgMgr = engines.pnpm ? "pnpm" : engines.yarn ? "yarn" : "npm";
-  execa.commandSync(`${pkgMgr}${isSynth ? " projen" : ""} ${process.argv.join(" ")}`, { stdio: "inherit" });
+  const pkgMgrCmd = engines.pnpm ? "pnpm" : engines.yarn ? "yarn" : "npm run";
+  execa.commandSync(`${pkgMgrCmd}${isSynth ? " default" : ""} ${process.argv.join(" ")}`, { stdio: "inherit" });
 } else {
   execa.commandSync(`npx projen ${process.argv.join(" ")}`, { stdio: "inherit"});
 }