diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 169bdd7..00fb514 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -29,7 +29,7 @@ jobs:
         mv latex/refman.pdf html/PDF-documentation.pdf
 
     - name: Deploy to GitHub Pages
-      uses: JamesIves/github-pages-deploy-action@4.1.0
+      uses: JamesIves/github-pages-deploy-action@4.1.3
       with:
         branch: gh-pages
         folder: html
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 768c637..ee7b640 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,16 +4,16 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
-- 
+- Fixed compatibility issues with devkitPPC release 39.
 
 ## [4.4.1] - 2021-03-05
 
-- Patch widescreen on Wii U.
+- Patched widescreen on Wii U.
 
 ## [4.4.0] - 2020-01-12
 
 - Removed libpng, zlib, libfreetype and libjpeg from the project. These libraries should now be installed in devkitPro with pacman.
-- GRRLIB and pngu are now installed into the _porlibs_ folder instead of the _libogc_ folder.
+- GRRLIB and pngu are now installed into the _portlibs_ folder instead of the _libogc_ folder.
 - Removed `uint` declaration. The `u32` type should be used instead.
 - The `GRRLIB_CreateEmptyTexture()` function is not inline anymore.
 
diff --git a/GRRLIB/GRRLIB/GRRLIB_3D.c b/GRRLIB/GRRLIB/GRRLIB_3D.c
index 76038b0..a1bcd3c 100644
--- a/GRRLIB/GRRLIB/GRRLIB_3D.c
+++ b/GRRLIB/GRRLIB/GRRLIB_3D.c
@@ -83,7 +83,7 @@ void GRRLIB_Camera3dSettings(f32 posx, f32 posy, f32 posz,
  * @param normalmode False, GX won't need normal coordinate, True, GX will need normal coordinate.
  */
 void GRRLIB_3dMode(f32 minDist, f32 maxDist, f32 fov, bool texturemode, bool normalmode) {
-    Mtx m;
+    Mtx44 m;
 
     guLookAt(_GRR_view, &_GRR_cam, &_GRR_up, &_GRR_look);
     guPerspective(m, fov, (f32)rmode->fbWidth/rmode->efbHeight, minDist, maxDist);
@@ -123,7 +123,8 @@ void GRRLIB_3dMode(f32 minDist, f32 maxDist, f32 fov, bool texturemode, bool nor
  * Go back to 2D mode (contributed by chris_c aka DaShAmAn).
  */
 void GRRLIB_2dMode() {
-    Mtx view, m;
+    Mtx view;
+    Mtx44 m;
 
     GX_SetZMode(GX_FALSE, GX_LEQUAL, GX_TRUE);