diff --git a/ext/roaring/bitmap32.c b/ext/roaring/bitmap32.c
index 29f02cf..3016197 100644
--- a/ext/roaring/bitmap32.c
+++ b/ext/roaring/bitmap32.c
@@ -238,6 +238,16 @@ static VALUE rb_roaring32_binary_op(VALUE self, VALUE other, binary_func func) {
     return TypedData_Wrap_Struct(cRoaringBitmap32, &roaring_type, result);
 }
 
+typedef void binary_func_inplace(roaring_bitmap_t *, const roaring_bitmap_t *);
+static VALUE rb_roaring32_binary_op_inplace(VALUE self, VALUE other, binary_func_inplace func) {
+    roaring_bitmap_t *self_data = get_bitmap(self);
+    roaring_bitmap_t *other_data = get_bitmap(other);
+
+    func(self_data, other_data);
+
+    return self;
+}
+
 typedef bool binary_func_bool(const roaring_bitmap_t *, const roaring_bitmap_t *);
 static VALUE rb_roaring32_binary_op_bool(VALUE self, VALUE other, binary_func_bool func) {
     roaring_bitmap_t *self_data = get_bitmap(self);
@@ -247,6 +257,25 @@ static VALUE rb_roaring32_binary_op_bool(VALUE self, VALUE other, binary_func_bo
     return RBOOL(result);
 }
 
+static VALUE rb_roaring32_and_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring32_binary_op_inplace(self, other, roaring_bitmap_and_inplace);
+}
+
+static VALUE rb_roaring32_or_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring32_binary_op_inplace(self, other, roaring_bitmap_or_inplace);
+}
+
+static VALUE rb_roaring32_xor_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring32_binary_op_inplace(self, other, roaring_bitmap_xor_inplace);
+}
+
+static VALUE rb_roaring32_andnot_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring32_binary_op_inplace(self, other, roaring_bitmap_andnot_inplace);
+}
 
 static VALUE rb_roaring32_and(VALUE self, VALUE other)
 {
@@ -306,6 +335,11 @@ rb_roaring32_init(void)
   rb_define_method(cRoaringBitmap32, "each", rb_roaring32_each, 0);
   rb_define_method(cRoaringBitmap32, "[]", rb_roaring32_aref, 1);
 
+  rb_define_method(cRoaringBitmap32, "and!", rb_roaring32_and_inplace, 1);
+  rb_define_method(cRoaringBitmap32, "or!", rb_roaring32_or_inplace, 1);
+  rb_define_method(cRoaringBitmap32, "xor!", rb_roaring32_xor_inplace, 1);
+  rb_define_method(cRoaringBitmap32, "andnot!", rb_roaring32_andnot_inplace, 1);
+
   rb_define_method(cRoaringBitmap32, "&", rb_roaring32_and, 1);
   rb_define_method(cRoaringBitmap32, "|", rb_roaring32_or, 1);
   rb_define_method(cRoaringBitmap32, "^", rb_roaring32_xor, 1);
diff --git a/ext/roaring/bitmap64.c b/ext/roaring/bitmap64.c
index 92d3283..720b297 100644
--- a/ext/roaring/bitmap64.c
+++ b/ext/roaring/bitmap64.c
@@ -243,6 +243,16 @@ static VALUE rb_roaring64_binary_op(VALUE self, VALUE other, binary_func func) {
     return TypedData_Wrap_Struct(cRoaringBitmap64, &roaring64_type, result);
 }
 
+typedef void binary_func_inplace(roaring64_bitmap_t *, const roaring64_bitmap_t *);
+static VALUE rb_roaring64_binary_op_inplace(VALUE self, VALUE other, binary_func_inplace func) {
+    roaring64_bitmap_t *self_data = get_bitmap(self);
+    roaring64_bitmap_t *other_data = get_bitmap(other);
+
+    func(self_data, other_data);
+
+    return self;
+}
+
 typedef bool binary_func_bool(const roaring64_bitmap_t *, const roaring64_bitmap_t *);
 static VALUE rb_roaring64_binary_op_bool(VALUE self, VALUE other, binary_func_bool func) {
     roaring64_bitmap_t *self_data = get_bitmap(self);
@@ -252,6 +262,25 @@ static VALUE rb_roaring64_binary_op_bool(VALUE self, VALUE other, binary_func_bo
     return RBOOL(result);
 }
 
+static VALUE rb_roaring64_and_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring64_binary_op_inplace(self, other, roaring64_bitmap_and_inplace);
+}
+
+static VALUE rb_roaring64_or_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring64_binary_op_inplace(self, other, roaring64_bitmap_or_inplace);
+}
+
+static VALUE rb_roaring64_xor_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring64_binary_op_inplace(self, other, roaring64_bitmap_xor_inplace);
+}
+
+static VALUE rb_roaring64_andnot_inplace(VALUE self, VALUE other)
+{
+    return rb_roaring64_binary_op_inplace(self, other, roaring64_bitmap_andnot_inplace);
+}
 
 static VALUE rb_roaring64_and(VALUE self, VALUE other)
 {
@@ -311,6 +340,11 @@ rb_roaring64_init(void)
   rb_define_method(cRoaringBitmap64, "each", rb_roaring64_each, 0);
   rb_define_method(cRoaringBitmap64, "[]", rb_roaring64_aref, 1);
 
+  rb_define_method(cRoaringBitmap64, "and!", rb_roaring64_and_inplace, 1);
+  rb_define_method(cRoaringBitmap64, "or!", rb_roaring64_or_inplace, 1);
+  rb_define_method(cRoaringBitmap64, "xor!", rb_roaring64_xor_inplace, 1);
+  rb_define_method(cRoaringBitmap64, "andnot!", rb_roaring64_andnot_inplace, 1);
+
   rb_define_method(cRoaringBitmap64, "&", rb_roaring64_and, 1);
   rb_define_method(cRoaringBitmap64, "|", rb_roaring64_or, 1);
   rb_define_method(cRoaringBitmap64, "^", rb_roaring64_xor, 1);
diff --git a/test/test_bitmaps.rb b/test/test_bitmaps.rb
index b27fff4..ec08485 100644
--- a/test/test_bitmaps.rb
+++ b/test/test_bitmaps.rb
@@ -229,6 +229,7 @@ def test_and
     r1 = bitmap_class[1, 2, 3, 4]
     r2 = bitmap_class[3, 4, 5, 6]
     result = r1 & r2
+    refute_same r1, result
     assert_equal [3, 4], result.to_a
   end
 
@@ -236,6 +237,7 @@ def test_or
     r1 = bitmap_class[1, 2, 3, 4]
     r2 = bitmap_class[3, 4, 5, 6]
     result = r1 | r2
+    refute_same r1, result
     assert_equal [1, 2, 3, 4, 5, 6], result.to_a
   end
 
@@ -243,6 +245,7 @@ def test_xor
     r1 = bitmap_class[1, 2, 3, 4]
     r2 = bitmap_class[3, 4, 5, 6]
     result = r1 ^ r2
+    refute_same r1, result
     assert_equal [1, 2, 5, 6], result.to_a
   end
 
@@ -250,6 +253,39 @@ def test_difference
     r1 = bitmap_class[1, 2, 3, 4]
     r2 = bitmap_class[3, 4, 5, 6]
     result = r1 - r2
+    refute_same r1, result
+    assert_equal [1, 2], result.to_a
+  end
+
+  def test_and_inplace
+    r1 = bitmap_class[1, 2, 3, 4]
+    r2 = bitmap_class[3, 4, 5, 6]
+    result = r1.and!(r2)
+    assert_same r1, result
+    assert_equal [3, 4], result.to_a
+  end
+
+  def test_or_inplace
+    r1 = bitmap_class[1, 2, 3, 4]
+    r2 = bitmap_class[3, 4, 5, 6]
+    result = r1.or!(r2)
+    assert_same r1, result
+    assert_equal [1, 2, 3, 4, 5, 6], result.to_a
+  end
+
+  def test_xor_inplace
+    r1 = bitmap_class[1, 2, 3, 4]
+    r2 = bitmap_class[3, 4, 5, 6]
+    result = r1.xor!(r2)
+    assert_same r1, result
+    assert_equal [1, 2, 5, 6], result.to_a
+  end
+
+  def test_difference_inplace
+    r1 = bitmap_class[1, 2, 3, 4]
+    r2 = bitmap_class[3, 4, 5, 6]
+    result = r1.andnot!(r2)
+    assert_same r1, result
     assert_equal [1, 2], result.to_a
   end