diff --git a/src/samplerate.cpp b/src/samplerate.cpp
index 42bb4d3..08ced74 100644
--- a/src/samplerate.cpp
+++ b/src/samplerate.cpp
@@ -179,7 +179,10 @@ class Resampler {
         sr_ratio       // src_ratio, sampling rate conversion ratio
     };
 
-    error_handler(src_process(_state, &src_data));
+    error_handler([&]() {
+      py::gil_scoped_release release;
+      return src_process(_state, &src_data);
+    }());
 
     // create a shorter view of the array
     if ((size_t)src_data.output_frames_gen < new_size) {
@@ -294,8 +297,12 @@ class CallbackResampler {
     if (_state == nullptr) _create();
 
     // read from the callback
-    size_t output_frames_gen = src_callback_read(
-        _state, _ratio, (long)frames, static_cast<float *>(outbuf.ptr));
+    size_t output_frames_gen = 0;
+    {
+      py::gil_scoped_release release;
+      output_frames_gen = src_callback_read(_state, _ratio, (long)frames,
+                                            static_cast<float *>(outbuf.ptr));
+    }
 
     // check error status
     if (output_frames_gen == 0) {
@@ -340,11 +347,14 @@ long the_callback_func(void *cb_data, float **data) {
   CallbackResampler *cb = static_cast<CallbackResampler *>(cb_data);
   int cb_channels = cb->get_channels();
 
-  // get the data as a numpy array
-  auto input = cb->callback();
+  py::buffer_info inbuf;
+  {
+    py::gil_scoped_acquire acquire;
 
-  // accessors for the arrays
-  py::buffer_info inbuf = input.request();
+    // get the data as a numpy array
+    auto input = cb->callback();
+    inbuf = input.request();
+  }
 
   // end of stream is signaled by a None, which is cast to a ndarray with ndim
   // == 0
@@ -407,9 +417,10 @@ py::array_t<float, py::array::c_style> resample(
       sr_ratio  // src_ratio, sampling rate conversion ratio
   };
 
-  int ret_code = src_simple(&src_data, converter_type_int, channels);
-
-  error_handler(ret_code);
+  error_handler([&]() {
+    py::gil_scoped_release release;
+    return src_simple(&src_data, converter_type_int, channels);
+  }());
 
   // create a shorter view of the array
   if ((size_t)src_data.output_frames_gen < new_size) {