diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 134e434..57a0bef 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -150,6 +150,18 @@ func evalIntegerInfixExpression(
 	case token.DIV:
 		result := new(big.Int).Div(&leftVal, &rightVal)
 		return &object.Integer{Value: *result}
+	case token.GREATER_THAN:
+		isGreater := leftVal.Cmp(&rightVal) == 1
+		return nativeBoolToBooleanObject(isGreater)
+	case token.LESS_THAN:
+		isLess := leftVal.Cmp(&rightVal) == -1
+		return nativeBoolToBooleanObject(isLess)
+	case token.EQUAL:
+		isEqual := leftVal.Cmp(&rightVal) == 0
+		return nativeBoolToBooleanObject(isEqual)
+	case token.NOT_EQUAL:
+		isNotEqual := leftVal.Cmp(&rightVal) != 0
+		return nativeBoolToBooleanObject(isNotEqual)
 	}
 }
 
diff --git a/evaluator/evaluator_test.go b/evaluator/evaluator_test.go
index 9c97c88..12d8a28 100644
--- a/evaluator/evaluator_test.go
+++ b/evaluator/evaluator_test.go
@@ -36,6 +36,14 @@ func Test_EvalBooleanExpression(t *testing.T) {
 	}{
 		{"true", true},
 		{"false", false},
+		{"1 > 2", false},
+		{"2 > 1", true},
+		{"2 < 3", true},
+		{"2 < 1", false},
+		{"3 == 3", true},
+		{"3 == 5", false},
+		{"3 != 4", true},
+		{"5 != 5", false},
 	}
 
 	for _, tt := range tests {