diff --git a/GRRLIB/GRRLIB/GRRLIB_fileIO.c b/GRRLIB/GRRLIB/GRRLIB_fileIO.c
index 642fd32..1df4244 100644
--- a/GRRLIB/GRRLIB/GRRLIB_fileIO.c
+++ b/GRRLIB/GRRLIB/GRRLIB_fileIO.c
@@ -1,5 +1,5 @@
 /*------------------------------------------------------------------------------
-Copyright (c) 2009-2022 The GRRLIB Team
+Copyright (c) 2009-2024 The GRRLIB Team
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -78,7 +78,6 @@ int  GRRLIB_LoadFile(const char* filename, u8* *data) {
  *         If an error occurs NULL will be returned.
  */
 GRRLIB_texImg*  GRRLIB_LoadTextureFromFile(const char *filename) {
-    GRRLIB_texImg  *tex;
     u8             *data;
 
     // Return NULL if load fails
@@ -87,7 +86,7 @@ GRRLIB_texImg*  GRRLIB_LoadTextureFromFile(const char *filename) {
     }
 
     // Convert to texture
-    tex = GRRLIB_LoadTexture(data);
+    GRRLIB_texImg *tex = GRRLIB_LoadTexture(data);
 
     // Free up the buffer
     free(data);
@@ -102,10 +101,9 @@ GRRLIB_texImg*  GRRLIB_LoadTextureFromFile(const char *filename) {
  *         If an error occurs NULL will be returned.
  */
 GRRLIB_ttfFont*  GRRLIB_LoadTTFFromFile(const char *filename) {
-    GRRLIB_ttfFont  *ttf;
     u8              *data;
 
-    s32 size = GRRLIB_LoadFile(filename, &data);
+    const s32 size = GRRLIB_LoadFile(filename, &data);
 
     // Return NULL if load fails
     if (size <= 0) {
@@ -113,7 +111,7 @@ GRRLIB_ttfFont*  GRRLIB_LoadTTFFromFile(const char *filename) {
     }
 
     // Convert to TTF
-    ttf = GRRLIB_LoadTTF(data, size);
+    GRRLIB_ttfFont *ttf = GRRLIB_LoadTTF(data, size);
 
     // Free up the buffer
     free(data);
diff --git a/GRRLIB/GRRLIB/GRRLIB_gecko.c b/GRRLIB/GRRLIB/GRRLIB_gecko.c
index 3351379..5b5d4eb 100644
--- a/GRRLIB/GRRLIB/GRRLIB_gecko.c
+++ b/GRRLIB/GRRLIB/GRRLIB_gecko.c
@@ -48,7 +48,6 @@ bool GRRLIB_GeckoInit(void) {
  * @param ... Optional arguments.
  */
 void  GRRLIB_GeckoPrintf (const char *text, ...) {
-    int size;
     char tmp[1024];
 
     if (geckoinit == false) {
@@ -57,7 +56,7 @@ void  GRRLIB_GeckoPrintf (const char *text, ...) {
 
     va_list argp;
     va_start(argp, text);
-    size = vsnprintf(tmp, sizeof(tmp), text, argp);
+    const int size = vsnprintf(tmp, sizeof(tmp), text, argp);
     va_end(argp);
 
     usb_sendbuffer_safe(1, tmp, size);
diff --git a/GRRLIB/GRRLIB/GRRLIB_texEdit.c b/GRRLIB/GRRLIB/GRRLIB_texEdit.c
index 7b7c607..1ad1fa1 100644
--- a/GRRLIB/GRRLIB/GRRLIB_texEdit.c
+++ b/GRRLIB/GRRLIB/GRRLIB_texEdit.c
@@ -160,7 +160,7 @@ GRRLIB_texImg*  GRRLIB_LoadTexturePNG (const u8 *my_png) {
     PNGUPROP imgProp;
     IMGCTX ctx = PNGU_SelectImageFromBuffer(my_png);
     PNGU_GetImageProperties(ctx, &imgProp);
-    my_texture->data = PNGU_DecodeTo4x4RGBA8(ctx, imgProp.imgWidth, imgProp.imgHeight, &width, &height, NULL);
+    my_texture->data = PNGU_DecodeTo4x4RGBA8(ctx, imgProp.imgWidth, imgProp.imgHeight, &width, &height);
     if (my_texture->data != NULL) {
         my_texture->w = width;
         my_texture->h = height;
diff --git a/GRRLIB/GRRLIB/GRRLIB_ttf.c b/GRRLIB/GRRLIB/GRRLIB_ttf.c
index df56d29..82715c2 100644
--- a/GRRLIB/GRRLIB/GRRLIB_ttf.c
+++ b/GRRLIB/GRRLIB/GRRLIB_ttf.c
@@ -131,7 +131,6 @@ void GRRLIB_PrintfTTFW(int x, int y, GRRLIB_ttfFont *myFont, const wchar_t *utf3
     int penX = 0;
     int penY = fontSize;
     FT_GlyphSlot slot = Face->glyph;
-    FT_UInt glyphIndex;
     FT_UInt previousGlyph = 0;
     const u8 cR = R(color);
     const u8 cG = G(color);
@@ -145,7 +144,7 @@ void GRRLIB_PrintfTTFW(int x, int y, GRRLIB_ttfFont *myFont, const wchar_t *utf3
     /* Loop over each character, until the
      * end of the string is reached, or until the pixel width is too wide */
     while(*utf32) {
-        glyphIndex = FT_Get_Char_Index(myFont->face, *utf32++);
+        const FT_UInt glyphIndex = FT_Get_Char_Index(myFont->face, *utf32++);
 
         if (myFont->kerning && previousGlyph && glyphIndex) {
             FT_Vector delta;
diff --git a/GRRLIB/lib/pngu/pngu.c b/GRRLIB/lib/pngu/pngu.c
index 72d50f7..fe14ada 100644
--- a/GRRLIB/lib/pngu/pngu.c
+++ b/GRRLIB/lib/pngu/pngu.c
@@ -564,10 +564,9 @@ static inline PNGU_u32 coordsRGBA8(PNGU_u32 x, PNGU_u32 y, PNGU_u32 w)
 }
 
 // Coded by Tantric for WiiMC (http://www.wiimc.org)
-PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, int * dstWidth, int * dstHeight, PNGU_u8 *dstPtr)
+PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, int * dstWidth, int * dstHeight)
 {
 	PNGU_u8 default_alpha = 255;    // default alpha value, which is used if the source image doesn't have an alpha channel.
-	PNGU_u8 *dst;
 	int x, y, x2=0, y2=0, offset;
 	int xRatio = 0, yRatio = 0;
 	png_byte *pixel;
@@ -604,10 +603,7 @@ PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, in
 	int len = (padWidth * padHeight) << 2;
 	if(len%32) len += (32-len%32);
 
-	if(dstPtr)
-		dst = dstPtr; // use existing allocation
-	else
-		dst = memalign (32, len);
+	PNGU_u8 *dst = memalign (32, len);
 
 	if(!dst)
 		return NULL;
diff --git a/GRRLIB/lib/pngu/pngu.h b/GRRLIB/lib/pngu/pngu.h
index 7c0a733..3340f5f 100644
--- a/GRRLIB/lib/pngu/pngu.h
+++ b/GRRLIB/lib/pngu/pngu.h
@@ -151,7 +151,7 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
 
 // Expands selected image into a 4x4 tiled RGBA8 buffer. You need to specify context, image dimensions,
 // destination address.
-PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, int * dstWidth, int * dstHeight, PNGU_u8 *dstPtr);
+PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, int * dstWidth, int * dstHeight);
 
 // Encodes an YCbYCr image in PNG format and stores it in the selected device or memory buffer. You need to
 // specify context, image dimensions, destination address and stride in pixels (stride = buffer width - image width).