diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index 5cabb6622..e2a9de65c 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -141,7 +141,7 @@ jobs:
       if: steps.build-cache.outputs.cache-hit != 'true'
       run: "& winbuild\\build\\build_dep_fribidi.cmd"
 
-    # trim ~150MB x 9
+    # trim ~150MB for each job
     - name: Optimize build cache
       if: steps.build-cache.outputs.cache-hit != 'true'
       run: rmdir /S /Q winbuild\build\src
diff --git a/src/_webp.c b/src/_webp.c
index c2532a496..493e0709c 100644
--- a/src/_webp.c
+++ b/src/_webp.c
@@ -178,12 +178,11 @@ _anim_encoder_new(PyObject *self, PyObject *args) {
     return NULL;
 }
 
-PyObject *
+void
 _anim_encoder_dealloc(PyObject *self) {
     WebPAnimEncoderObject *encp = (WebPAnimEncoderObject *)self;
     WebPPictureFree(&(encp->frame));
     WebPAnimEncoderDelete(encp->enc);
-    Py_RETURN_NONE;
 }
 
 PyObject *
@@ -400,12 +399,11 @@ _anim_decoder_new(PyObject *self, PyObject *args) {
     return NULL;
 }
 
-PyObject *
+void
 _anim_decoder_dealloc(PyObject *self) {
     WebPAnimDecoderObject *decp = (WebPAnimDecoderObject *)self;
     WebPDataClear(&(decp->data));
     WebPAnimDecoderDelete(decp->dec);
-    Py_RETURN_NONE;
 }
 
 PyObject *
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index e4bf275a1..66e352c73 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -152,9 +152,9 @@ deps = {
         "libs": [r"*.lib"],
     },
     "xz": {
-        "url": SF_PROJECTS + "/lzmautils/files/xz-5.2.8.tar.gz/download",
-        "filename": "xz-5.2.8.tar.gz",
-        "dir": "xz-5.2.8",
+        "url": SF_PROJECTS + "/lzmautils/files/xz-5.2.9.tar.gz/download",
+        "filename": "xz-5.2.9.tar.gz",
+        "dir": "xz-5.2.9",
         "license": "COPYING",
         "patch": {
             r"src\liblzma\api\lzma.h": {