diff --git a/ext/gd/libgd/gd.c b/ext/gd/libgd/gd.c
index 71a0e9ea63f2..bef2e3a4df0c 100644
--- a/ext/gd/libgd/gd.c
+++ b/ext/gd/libgd/gd.c
@@ -3188,7 +3188,7 @@ int gdImagePaletteToTrueColor(gdImagePtr src)
 		const unsigned int sx = gdImageSX(src);
 
 		// Note: do not revert back to gdMalloc() below ; reason here,
-		// due to a bug with a certain memory_limit INI value treshold,
+		// due to a bug with a certain memory_limit INI value threshold,
 		// imagepalettetotruecolor crashes with even unrelated ZendMM allocations.
 		// See GH-17772 for a use case.
 		src->tpixels = (int **) gdCalloc(sy, sizeof(int *));
diff --git a/ext/gd/libgd/gd.h b/ext/gd/libgd/gd.h
index 5325a6370925..26c4196e85e1 100644
--- a/ext/gd/libgd/gd.h
+++ b/ext/gd/libgd/gd.h
@@ -50,7 +50,7 @@ extern "C" {
 	pixels are represented by integers, which
 	must be 32 bits wide or more.
 
-	True colors are repsented as follows:
+	True colors are represented as follows:
 
 	ARGB
 
diff --git a/ext/gd/libgd/gd_bmp.c b/ext/gd/libgd/gd_bmp.c
index c7c9cc9d8c1e..85a3d5ccfd6d 100644
--- a/ext/gd/libgd/gd_bmp.c
+++ b/ext/gd/libgd/gd_bmp.c
@@ -157,7 +157,7 @@ static int _gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression){
 	gdBMPPutInt(out, (compression ? BMP_BI_RLE8 : BMP_BI_RGB)); /* compression */
 	gdBMPPutInt(out, bitmap_size); /* image size */
 	gdBMPPutInt(out, 0); /* H resolution */
-	gdBMPPutInt(out, 0); /* V ressolution */
+	gdBMPPutInt(out, 0); /* V resolution */
 	gdBMPPutInt(out, im->colorsTotal); /* colours used */
 	gdBMPPutInt(out, 0); /* important colours */
 
diff --git a/ext/gd/libgd/gd_interpolation.c b/ext/gd/libgd/gd_interpolation.c
index f8ba9087910f..fa15c4c59dc6 100644
--- a/ext/gd/libgd/gd_interpolation.c
+++ b/ext/gd/libgd/gd_interpolation.c
@@ -113,7 +113,7 @@ typedef struct
 {
    double *Weights;  /* Normalized weights of neighboring pixels */
    int Left,Right;   /* Bounds of source pixels window */
-} ContributionType;  /* Contirbution information for a single pixel */
+} ContributionType;  /* Contribution information for a single pixel */
 
 typedef struct
 {
@@ -481,7 +481,7 @@ static double filter_hermite(const double x1)
 	return 0.0;
 }
 
-/* Trangle filter, default radius 1 */
+/* Triangle filter, default radius 1 */
 static double filter_triangle(const double x1)
 {
 	const double x = x1 < 0.0 ? -x1 : x1;
@@ -630,7 +630,7 @@ static double filter_welsh(const double x)
 #endif
 
 
-/* keep it for future usage for affine copy over an existing image, targetting fix for 2.2.2 */
+/* keep it for future usage for affine copy over an existing image, targeting fix for 2.2.2 */
 #if 0 
 /* Copied from upstream's libgd */
 static inline int _color_blend (const int dst, const int src)
diff --git a/ext/gd/libgd/gd_tga.c b/ext/gd/libgd/gd_tga.c
index f888f9ea6fbe..bd49475e6e2c 100644
--- a/ext/gd/libgd/gd_tga.c
+++ b/ext/gd/libgd/gd_tga.c
@@ -236,7 +236,7 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
 	if (tga->imagetype != TGA_TYPE_RGB && tga->imagetype != TGA_TYPE_RGB_RLE)
 		return -1;
 
-	/*!	\brief Allocate memmory for image block
+	/*!	\brief Allocate memory for image block
 	 *  Allocate a chunk of memory for the image block to be passed into.
 	 */
 	tga->bitmap = (int *) gdMalloc(image_block_size * sizeof(int));
diff --git a/ext/gd/libgd/gd_tga.h b/ext/gd/libgd/gd_tga.h
index 297f3dc99d6d..34da6197db18 100644
--- a/ext/gd/libgd/gd_tga.h
+++ b/ext/gd/libgd/gd_tga.h
@@ -23,7 +23,7 @@ typedef struct oTga_ {
 	uint8_t alphabits;		// alpha bits (low 4bits of header 17)
 	uint8_t fliph;			// horizontal or vertical
 	uint8_t flipv;			// flip
-	char *ident;		// identifcation tag string
+	char *ident;		// identification tag string
 	int *bitmap;		// bitmap data
 
 } oTga;
diff --git a/ext/gd/libgd/gdft.c b/ext/gd/libgd/gdft.c
index 34a4064f5fcb..3f9cf59d568c 100644
--- a/ext/gd/libgd/gdft.c
+++ b/ext/gd/libgd/gdft.c
@@ -400,7 +400,7 @@ static void *fontFetch (char **error, void *key)
 	fontlist = gdEstrdup(a->fontlist);
 
 	/*
-	 * Must use gd_strtok_r becasuse strtok() isn't thread safe
+	 * Must use gd_strtok_r because strtok() isn't thread safe
 	 */
 	for (name = gd_strtok_r (fontlist, LISTSEPARATOR, &strtok_ptr); name; name = gd_strtok_r (0, LISTSEPARATOR, &strtok_ptr)) {
 		char *strtok_ptr_path;