diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicodedbuffer.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicodedbuffer.c
index 5d5f3a2ea4..fd8610c644 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicodedbuffer.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicodedbuffer.c
@@ -69,7 +69,7 @@ coded_buffer_free (GstVaapiCodedBuffer * buf)
 
   gst_vaapi_display_replace (&GST_VAAPI_CODED_BUFFER_DISPLAY (buf), NULL);
 
-  g_slice_free1 (sizeof (GstVaapiCodedBuffer), buf);
+  g_free (buf);
 }
 
 static gboolean
@@ -126,7 +126,7 @@ gst_vaapi_coded_buffer_new (GstVaapiContext * context, guint buf_size)
   display = GST_VAAPI_CONTEXT_DISPLAY (context);
   g_return_val_if_fail (display != NULL, NULL);
 
-  buf = g_slice_new (GstVaapiCodedBuffer);
+  buf = g_new (GstVaapiCodedBuffer, 1);
   if (!buf)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicontext.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicontext.c
index 97b81dcb17..d37b6bc24b 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicontext.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapicontext.c
@@ -500,7 +500,7 @@ gst_vaapi_context_new (GstVaapiDisplay * display,
       || cip->entrypoint == GST_VAAPI_ENTRYPOINT_INVALID)
     return NULL;
 
-  context = g_slice_new (GstVaapiContext);
+  context = g_new (GstVaapiContext, 1);
   if (!context)
     return NULL;
 
@@ -783,6 +783,6 @@ gst_vaapi_context_unref (GstVaapiContext * context)
     context_destroy (context);
     context_destroy_surfaces (context);
     gst_vaapi_display_replace (&context->display, NULL);
-    g_slice_free (GstVaapiContext, context);
+    g_free (context);
   }
 }
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder.c
index ed702310ba..d9ec37cbe4 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder.c
@@ -326,7 +326,7 @@ decode_step (GstVaapiDecoder * decoder)
 
   do {
     if (!ps->current_frame) {
-      ps->current_frame = g_slice_new0 (GstVideoCodecFrame);
+      ps->current_frame = g_new0 (GstVideoCodecFrame, 1);
       if (!ps->current_frame)
         return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
       ps->current_frame->ref_count = 1;
@@ -569,7 +569,7 @@ gst_vaapi_decoder_init (GstVaapiDecoder * decoder)
 
   parser_state_init (&decoder->parser_state);
 
-  codec_state = g_slice_new0 (GstVideoCodecState);
+  codec_state = g_new0 (GstVideoCodecState, 1);
   codec_state->ref_count = 1;
   gst_video_info_init (&codec_state->info);
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder_av1.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder_av1.c
index e8a0e310fb..68ae3ef3c8 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder_av1.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapidecoder_av1.c
@@ -297,8 +297,9 @@ av1_decode_seqeunce (GstVaapiDecoderAV1 * decoder, GstVaapiDecoderUnit * unit)
 
   /* update the sequence */
   if (priv->seq_header)
-    g_slice_free (GstAV1SequenceHeaderOBU, priv->seq_header);
-  priv->seq_header = g_slice_dup (GstAV1SequenceHeaderOBU, &pi->seq_header);
+    g_free (priv->seq_header);
+  priv->seq_header =
+      g_memdup2 (&pi->seq_header, sizeof (GstAV1SequenceHeaderOBU));
 
   return GST_VAAPI_DECODER_STATUS_SUCCESS;
 }
@@ -988,7 +989,7 @@ av1_decoder_reset (GstVaapiDecoderAV1 * decoder)
     gst_vaapi_picture_replace (&priv->current_picture, NULL);
 
   if (priv->seq_header) {
-    g_slice_free (GstAV1SequenceHeaderOBU, priv->seq_header);
+    g_free (priv->seq_header);
     priv->seq_header = NULL;
   }
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h264.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h264.c
index ad56cca2c4..dc005e56bf 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h264.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h264.c
@@ -1888,14 +1888,14 @@ reference_pic_free (GstVaapiEncoderH264 * encoder, GstVaapiEncoderH264Ref * ref)
     return;
   if (ref->pic)
     gst_vaapi_encoder_release_surface (GST_VAAPI_ENCODER (encoder), ref->pic);
-  g_slice_free (GstVaapiEncoderH264Ref, ref);
+  g_free (ref);
 }
 
 static inline GstVaapiEncoderH264Ref *
 reference_pic_create (GstVaapiEncoderH264 * encoder,
     GstVaapiEncPicture * picture, GstVaapiSurfaceProxy * surface)
 {
-  GstVaapiEncoderH264Ref *const ref = g_slice_new0 (GstVaapiEncoderH264Ref);
+  GstVaapiEncoderH264Ref *const ref = g_new0 (GstVaapiEncoderH264Ref, 1);
 
   ref->pic = surface;
   ref->frame_num = picture->frame_num;
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h265.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h265.c
index caec85f041..6751c2f7b8 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h265.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiencoder_h265.c
@@ -1767,14 +1767,14 @@ reference_pic_free (GstVaapiEncoderH265 * encoder, GstVaapiEncoderH265Ref * ref)
     return;
   if (ref->pic)
     gst_vaapi_encoder_release_surface (GST_VAAPI_ENCODER (encoder), ref->pic);
-  g_slice_free (GstVaapiEncoderH265Ref, ref);
+  g_free (ref);
 }
 
 static inline GstVaapiEncoderH265Ref *
 reference_pic_create (GstVaapiEncoderH265 * encoder,
     GstVaapiEncPicture * picture, GstVaapiSurfaceProxy * surface)
 {
-  GstVaapiEncoderH265Ref *const ref = g_slice_new0 (GstVaapiEncoderH265Ref);
+  GstVaapiEncoderH265Ref *const ref = g_new0 (GstVaapiEncoderH265Ref, 1);
 
   ref->pic = surface;
   ref->poc = picture->poc;
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapifilter.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapifilter.c
index 447c6decf7..1458dd8366 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapifilter.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapifilter.c
@@ -538,7 +538,7 @@ static void
 op_data_free (GstVaapiFilterOpData * op_data)
 {
   g_free (op_data->va_caps);
-  g_slice_free (GstVaapiFilterOpData, op_data);
+  g_free (op_data);
 }
 
 static inline gpointer
@@ -546,7 +546,7 @@ op_data_new (GstVaapiFilterOp op, GParamSpec * pspec)
 {
   GstVaapiFilterOpData *op_data;
 
-  op_data = g_slice_new0 (GstVaapiFilterOpData);
+  op_data = g_new0 (GstVaapiFilterOpData, 1);
   if (!op_data)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiimage.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiimage.c
index 18389adf7b..53af85656e 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiimage.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiimage.c
@@ -141,7 +141,7 @@ gst_vaapi_image_free (GstVaapiImage * image)
 
   gst_vaapi_display_replace (&GST_VAAPI_IMAGE_DISPLAY (image), NULL);
 
-  g_slice_free1 (sizeof (GstVaapiImage), image);
+  g_free (image);
 }
 
 static gboolean
@@ -284,7 +284,7 @@ gst_vaapi_image_new (GstVaapiDisplay * display,
   GST_DEBUG ("format %s, size %ux%u", gst_vaapi_video_format_to_string (format),
       width, height);
 
-  image = g_slice_new (GstVaapiImage);
+  image = g_new (GstVaapiImage, 1);
   if (!image)
     return NULL;
 
@@ -328,7 +328,7 @@ gst_vaapi_image_new_with_image (GstVaapiDisplay * display, VAImage * va_image)
       GST_FOURCC_ARGS (va_image->format.fourcc),
       va_image->width, va_image->height);
 
-  image = g_slice_new (GstVaapiImage);
+  image = g_new (GstVaapiImage, 1);
   if (!image)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiminiobject.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiminiobject.c
index 30586b04be..68f0628c92 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiminiobject.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiminiobject.c
@@ -34,7 +34,7 @@ gst_vaapi_mini_object_free (GstVaapiMiniObject * object)
     klass->finalize (object);
 
   if (G_LIKELY (g_atomic_int_dec_and_test (&object->ref_count)))
-    g_slice_free1 (klass->size, object);
+    g_free (object);
 }
 
 /**
@@ -65,7 +65,7 @@ gst_vaapi_mini_object_new (const GstVaapiMiniObjectClass * object_class)
 
   g_return_val_if_fail (object_class->size >= sizeof (*object), NULL);
 
-  object = g_slice_alloc (object_class->size);
+  object = g_malloc (object_class->size);
   if (!object)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisubpicture.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisubpicture.c
index c2ba257b1e..4ba6770658 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisubpicture.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisubpicture.c
@@ -84,7 +84,7 @@ gst_vaapi_subpicture_free (GstVaapiSubpicture * subpicture)
 {
   gst_vaapi_subpicture_free_image (subpicture);
   gst_vaapi_display_replace (&subpicture->display, NULL);
-  g_slice_free1 (sizeof (GstVaapiSubpicture), subpicture);
+  g_free (subpicture);
 }
 
 GST_DEFINE_MINI_OBJECT_TYPE (GstVaapiSubpicture, gst_vaapi_subpicture);
@@ -142,7 +142,7 @@ gst_vaapi_subpicture_new (GstVaapiImage * image, guint flags)
   if (flags & ~va_flags)
     return NULL;
 
-  subpicture = g_slice_new (GstVaapiSubpicture);
+  subpicture = g_new (GstVaapiSubpicture, 1);
   if (!subpicture)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisurface.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisurface.c
index 0fdafd99f4..dd3cd439c8 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisurface.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapisurface.c
@@ -90,7 +90,7 @@ gst_vaapi_surface_free (GstVaapiSurface * surface)
   gst_vaapi_buffer_proxy_replace (&surface->extbuf_proxy, NULL);
   gst_vaapi_display_replace (&GST_VAAPI_SURFACE_DISPLAY (surface), NULL);
 
-  g_slice_free1 (sizeof (GstVaapiSurface), surface);
+  g_free (surface);
 }
 
 static gboolean
@@ -330,7 +330,7 @@ GST_DEFINE_MINI_OBJECT_TYPE (GstVaapiSurface, gst_vaapi_surface);
 static GstVaapiSurface *
 gst_vaapi_surface_create (GstVaapiDisplay * display)
 {
-  GstVaapiSurface *surface = g_slice_new (GstVaapiSurface);
+  GstVaapiSurface *surface = g_new (GstVaapiSurface, 1);
   if (!surface)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapitexture.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapitexture.c
index 9bfc87bb28..27f66416ea 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapitexture.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapitexture.c
@@ -83,7 +83,7 @@ static void
 gst_vaapi_texture_free (GstVaapiTexture * texture)
 {
   gst_vaapi_display_replace (&GST_VAAPI_TEXTURE_DISPLAY (texture), NULL);
-  g_slice_free1 (sizeof (GstVaapiTexture), texture);
+  g_free (texture);
 }
 
 GST_DEFINE_MINI_OBJECT_TYPE (GstVaapiTexture, gst_vaapi_texture);
@@ -100,7 +100,7 @@ gst_vaapi_texture_new_internal (GstVaapiDisplay * display, GstVaapiID id,
   g_return_val_if_fail (width > 0, NULL);
   g_return_val_if_fail (height > 0, NULL);
 
-  texture = g_slice_alloc (sizeof (GstVaapiTexture));
+  texture = g_new (GstVaapiTexture, 1);
   if (!texture)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiutils_core.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiutils_core.c
index 7c98208d42..d67ea07903 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiutils_core.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiutils_core.c
@@ -143,7 +143,7 @@ gst_vaapi_config_surface_attributes_get (GstVaapiDisplay * display,
   if (!surface_attribs)
     return NULL;
 
-  attribs = g_slice_new0 (GstVaapiConfigSurfaceAttributes);
+  attribs = g_new0 (GstVaapiConfigSurfaceAttributes, 1);
   if (!attribs)
     goto error;
 
@@ -223,5 +223,5 @@ gst_vaapi_config_surface_attributes_free (GstVaapiConfigSurfaceAttributes *
 
   if (attribs->formats)
     g_array_unref (attribs->formats);
-  g_slice_free (GstVaapiConfigSurfaceAttributes, attribs);
+  g_free (attribs);
 }
diff --git a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c
index 394a089bb5..4f2c68c767 100644
--- a/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c
+++ b/subprojects/gstreamer-vaapi/gst-libs/gst/vaapi/gstvaapiwindow_wayland.c
@@ -71,7 +71,7 @@ frame_state_new (GstVaapiWindow * window)
 {
   FrameState *frame;
 
-  frame = g_slice_new (FrameState);
+  frame = g_new (FrameState, 1);
   if (!frame)
     return NULL;
 
@@ -160,7 +160,7 @@ frame_state_free (FrameState * frame)
 
   g_clear_pointer (&frame->callback, wl_callback_destroy);
   wl_buffer_destroy (frame->buffer);
-  g_slice_free (FrameState, frame);
+  g_free (frame);
 }
 
 static void
diff --git a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapidecode.c b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapidecode.c
index 9f6eaba64f..c77258032e 100644
--- a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapidecode.c
+++ b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapidecode.c
@@ -145,7 +145,7 @@ copy_video_codec_state (const GstVideoCodecState * in_state)
 
   g_return_val_if_fail (in_state != NULL, NULL);
 
-  state = g_slice_new0 (GstVideoCodecState);
+  state = g_new0 (GstVideoCodecState, 1);
   state->ref_count = 1;
   state->info = in_state->info;
   state->caps = gst_caps_copy (in_state->caps);
diff --git a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode.c b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode.c
index e86d55b9e1..ccbb3d43b0 100644
--- a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode.c
+++ b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapiencode.c
@@ -122,7 +122,7 @@ prop_value_free (PropValue * prop_value)
     g_param_spec_unref (prop_value->pspec);
     prop_value->pspec = NULL;
   }
-  g_slice_free (PropValue, prop_value);
+  g_free (prop_value);
 }
 
 static PropValue *
@@ -133,7 +133,7 @@ prop_value_new_entry (guint id, GParamSpec * pspec, const GValue * value)
   if (!pspec)
     return NULL;
 
-  prop_value = g_slice_new0 (PropValue);
+  prop_value = g_new0 (PropValue, 1);
   if (!prop_value)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideomemory.c b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideomemory.c
index 8c1f5887dc..ad5890fb37 100644
--- a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideomemory.c
+++ b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideomemory.c
@@ -361,7 +361,7 @@ gst_vaapi_video_memory_new (GstAllocator * base_allocator,
 
   g_return_val_if_fail (GST_VAAPI_IS_VIDEO_ALLOCATOR (allocator), NULL);
 
-  mem = g_slice_new (GstVaapiVideoMemory);
+  mem = g_new (GstVaapiVideoMemory, 1);
   if (!mem)
     return NULL;
 
@@ -620,7 +620,7 @@ gst_vaapi_video_allocator_free (GstAllocator * allocator, GstMemory * base_mem)
   gst_vaapi_surface_proxy_replace (&mem->proxy, NULL);
   gst_vaapi_video_meta_replace (&mem->meta, NULL);
   g_mutex_clear (&mem->lock);
-  g_slice_free (GstVaapiVideoMemory, mem);
+  g_free (mem);
 }
 
 static void
diff --git a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa.c b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa.c
index 53a48dd90f..bb47fe723a 100644
--- a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa.c
+++ b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa.c
@@ -169,13 +169,13 @@ gst_vaapi_video_meta_init (GstVaapiVideoMeta * meta)
 static inline GstVaapiVideoMeta *
 _gst_vaapi_video_meta_create (void)
 {
-  return g_slice_new (GstVaapiVideoMeta);
+  return g_new (GstVaapiVideoMeta, 1);
 }
 
 static inline void
 _gst_vaapi_video_meta_destroy (GstVaapiVideoMeta * meta)
 {
-  g_slice_free1 (sizeof (*meta), meta);
+  g_free (meta);
 }
 
 static inline GstVaapiVideoMeta *
diff --git a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa_texture.c b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa_texture.c
index 79863cb9e2..6365b78098 100644
--- a/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa_texture.c
+++ b/subprojects/gstreamer-vaapi/gst/vaapi/gstvaapivideometa_texture.c
@@ -126,7 +126,7 @@ meta_texture_free (GstVaapiVideoMetaTexture * meta)
     return;
 
   gst_mini_object_replace ((GstMiniObject **) & meta->texture, NULL);
-  g_slice_free (GstVaapiVideoMetaTexture, meta);
+  g_free (meta);
 }
 
 static GstVaapiVideoMetaTexture *
@@ -134,7 +134,7 @@ meta_texture_new (void)
 {
   GstVaapiVideoMetaTexture *meta;
 
-  meta = g_slice_new (GstVaapiVideoMetaTexture);
+  meta = g_new (GstVaapiVideoMetaTexture, 1);
   if (!meta)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/tests/internal/codec.c b/subprojects/gstreamer-vaapi/tests/internal/codec.c
index d14981ac8e..d7487f80c5 100644
--- a/subprojects/gstreamer-vaapi/tests/internal/codec.c
+++ b/subprojects/gstreamer-vaapi/tests/internal/codec.c
@@ -135,7 +135,7 @@ codec_identifier_free (CodecIdentifier * cip)
     cip->file = NULL;
   }
   gst_caps_replace (&cip->caps, NULL);
-  g_slice_free (CodecIdentifier, cip);
+  g_free (cip);
 }
 
 static CodecIdentifier *
@@ -144,7 +144,7 @@ codec_identifier_new (const gchar * filename)
   CodecIdentifier *cip;
   GstTypeFind *tfp;
 
-  cip = g_slice_new0 (CodecIdentifier);
+  cip = g_new0 (CodecIdentifier, 1);
   if (!cip)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/tests/internal/simple-decoder.c b/subprojects/gstreamer-vaapi/tests/internal/simple-decoder.c
index 7575276729..ada9d785a3 100644
--- a/subprojects/gstreamer-vaapi/tests/internal/simple-decoder.c
+++ b/subprojects/gstreamer-vaapi/tests/internal/simple-decoder.c
@@ -110,7 +110,7 @@ typedef struct
 static inline RenderFrame *
 render_frame_new (void)
 {
-  return g_slice_new (RenderFrame);
+  return g_new (RenderFrame, 1);
 }
 
 static void
@@ -119,7 +119,7 @@ render_frame_free (RenderFrame * rfp)
   if (G_UNLIKELY (!rfp))
     return;
   gst_vaapi_surface_proxy_replace (&rfp->proxy, NULL);
-  g_slice_free (RenderFrame, rfp);
+  g_free (rfp);
 }
 
 static inline void
@@ -536,7 +536,7 @@ app_free (App * app)
   g_cond_clear (&app->render_ready);
   g_cond_clear (&app->event_cond);
   g_mutex_clear (&app->mutex);
-  g_slice_free (App, app);
+  g_free (app);
 }
 
 static App *
@@ -544,7 +544,7 @@ app_new (void)
 {
   App *app;
 
-  app = g_slice_new0 (App);
+  app = g_new0 (App, 1);
   if (!app)
     return NULL;
 
diff --git a/subprojects/gstreamer-vaapi/tests/internal/simple-encoder.c b/subprojects/gstreamer-vaapi/tests/internal/simple-encoder.c
index 90b778e35b..6953eef1a6 100644
--- a/subprojects/gstreamer-vaapi/tests/internal/simple-encoder.c
+++ b/subprojects/gstreamer-vaapi/tests/internal/simple-encoder.c
@@ -155,7 +155,7 @@ new_codec_state (gint width, gint height, gint fps_n, gint fps_d)
 {
   GstVideoCodecState *state;
 
-  state = g_slice_new0 (GstVideoCodecState);
+  state = g_new0 (GstVideoCodecState, 1);
   state->ref_count = 1;
   gst_video_info_set_format (&state->info, GST_VIDEO_FORMAT_ENCODED, width,
       height);
@@ -175,7 +175,7 @@ set_format (GstVaapiEncoder * encoder, gint width, gint height, gint fps_n,
 
   in_state = new_codec_state (width, height, fps_n, fps_d);
   status = gst_vaapi_encoder_set_codec_state (encoder, in_state);
-  g_slice_free (GstVideoCodecState, in_state);
+  g_free (in_state);
 
   return (status == GST_VAAPI_ENCODER_STATUS_SUCCESS);
 }
@@ -308,13 +308,13 @@ app_free (App * app)
   if (app->output_file)
     fclose (app->output_file);
 
-  g_slice_free (App, app);
+  g_free (app);
 }
 
 static App *
 app_new (const gchar * input_fn, const gchar * output_fn)
 {
-  App *app = g_slice_new0 (App);
+  App *app = g_new0 (App, 1);
   if (!app)
     return NULL;
 
@@ -362,7 +362,7 @@ upload_frame (GstVaapiEncoder * encoder, GstVaapiSurfaceProxy * proxy)
   GstVideoCodecFrame *frame;
   GstVaapiEncoderStatus ret;
 
-  frame = g_slice_new0 (GstVideoCodecFrame);
+  frame = g_new0 (GstVideoCodecFrame, 1);
   gst_video_codec_frame_set_user_data (frame,
       gst_vaapi_surface_proxy_ref (proxy),
       (GDestroyNotify) gst_vaapi_surface_proxy_unref);
diff --git a/subprojects/gstreamer-vaapi/tests/internal/y4mreader.c b/subprojects/gstreamer-vaapi/tests/internal/y4mreader.c
index 76847bb217..400ad52cff 100644
--- a/subprojects/gstreamer-vaapi/tests/internal/y4mreader.c
+++ b/subprojects/gstreamer-vaapi/tests/internal/y4mreader.c
@@ -144,7 +144,7 @@ y4m_reader_open (const gchar * filename)
 {
   Y4MReader *imagefile;
 
-  imagefile = g_slice_new0 (Y4MReader);
+  imagefile = g_new0 (Y4MReader, 1);
 
   if (filename) {
     imagefile->fp = fopen (filename, "r");
@@ -165,7 +165,7 @@ bail:
   if (imagefile->fp && imagefile->fp != stdin)
     fclose (imagefile->fp);
 
-  g_slice_free (Y4MReader, imagefile);
+  g_free (imagefile);
   return NULL;
 }
 
@@ -177,7 +177,7 @@ y4m_reader_close (Y4MReader * file)
   if (file->fp && file->fp != stdin)
     fclose (file->fp);
 
-  g_slice_free (Y4MReader, file);
+  g_free (file);
 }
 
 static gboolean