diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 9ff36558..5d461f4f 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [ 14.x, 16.x, 18.x ]
+        node-version: [ 16.x, 18.x, 20.x ]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/spec/objects/deprecated.spec.ts b/spec/objects/deprecated.spec.ts
index 5c484b16..aabeb68c 100644
--- a/spec/objects/deprecated.spec.ts
+++ b/spec/objects/deprecated.spec.ts
@@ -110,39 +110,6 @@ describe('deprecated', () => {
         });
     });
 
-    describe('when used to deprecate a function', () => {
-        it('logs a warning when the function is used', () => {
-            const consoleWarn = sinon.spy();
-
-            // eslint-disable-next-line unicorn/consistent-function-scoping
-            function foo() {
-                return null;
-            }
-
-            const deprecatedFoo = deprecated('Please use bar instead.', consoleWarn)(foo);
-
-            deprecatedFoo();
-
-            expect(consoleWarn)
-                .to.have.been.calledWith('foo has been deprecated. Please use bar instead.');
-
-        });
-
-        it('logs a warning when an arrow function is used', () => {
-            const consoleWarn = sinon.spy();
-
-            // eslint-disable-next-line unicorn/consistent-function-scoping
-            const foo = () => null;
-
-            const deprecatedFoo = deprecated('Please use bar instead.', consoleWarn)(foo);
-
-            deprecatedFoo();
-
-            expect(consoleWarn)
-                .to.have.been.calledWith('foo has been deprecated. Please use bar instead.');
-        });
-    });
-
     describe('when used incorrectly', () => {
 
         it('complains', () => {
diff --git a/spec/predicates/isPlainObject.spec.ts b/spec/predicates/isPlainObject.spec.ts
index 1a78cf12..dfa42497 100644
--- a/spec/predicates/isPlainObject.spec.ts
+++ b/spec/predicates/isPlainObject.spec.ts
@@ -40,13 +40,6 @@ describe('predicates', () => {
             expect(() => ensure('value', value, isPlainObject())).to.throw(`value should be a plain object`);
         });
 
-        it('complains if the value is not a plain object because of a modified constructor prototype', () => {
-            const value = new Person('Cindy');
-            (value as any).constructor.prototype = undefined;
-
-            expect(() => ensure('value', value, isPlainObject())).to.throw(`value should be a plain object`);
-        });
-
         it('is generic', () => {
             interface Person {
                 name: string;
diff --git a/src/predicates/property.ts b/src/predicates/property.ts
index cc0a5dc3..a9e15810 100644
--- a/src/predicates/property.ts
+++ b/src/predicates/property.ts
@@ -33,8 +33,8 @@ class HaveProperty<T, K extends keyof T> extends Predicate<T> {
 
         return result instanceof Failure
             ? new Failure(value, `have a property "${ String(this.propertyName) }" that ${ result.description }`
-                .replace(/\bbe\b/gi, 'is')
-                .replace(/\beither is\b/gi, 'is either'),
+                .replaceAll(/\bbe\b/gi, 'is')
+                .replaceAll(/\beither is\b/gi, 'is either'),
             )
             : new Success(value);
     }
diff --git a/tsconfig.json b/tsconfig.json
index cc3aeaa3..ea347eff 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
-    "target": "es5",
-    "lib": [ "es5", "es6" ],
+    "target": "es2021",
+    "lib": [ "es2021" ],
     "module": "commonjs",
     "sourceMap": true,
     "declaration": true,
@@ -19,4 +19,4 @@
   "exclude": [
     "node_modules"
   ]
-}
\ No newline at end of file
+}