diff --git a/part10-multicore/Makefile.gcc b/part10-multicore/Makefile.gcc
index d5cc1f5..9fe0560 100644
--- a/part10-multicore/Makefile.gcc
+++ b/part10-multicore/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -15,7 +15,7 @@ audio.o : audio.bin
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES) audio.o
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) audio.o -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) audio.o -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part2-building/Makefile.gcc b/part2-building/Makefile.gcc
index 89235e9..ae02b77 100644
--- a/part2-building/Makefile.gcc
+++ b/part2-building/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -12,7 +12,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part2-building/README.md b/part2-building/README.md
index 1d4e40d..ccf9986 100644
--- a/part2-building/README.md
+++ b/part2-building/README.md
@@ -12,7 +12,7 @@ If you're using Arm gcc on Linux, save the following as _Makefile_ (in the repo
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -23,7 +23,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part3-helloworld/Makefile.gcc b/part3-helloworld/Makefile.gcc
index 89235e9..ae02b77 100644
--- a/part3-helloworld/Makefile.gcc
+++ b/part3-helloworld/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -12,7 +12,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part4-miniuart/Makefile.gcc b/part4-miniuart/Makefile.gcc
index 89235e9..ae02b77 100644
--- a/part4-miniuart/Makefile.gcc
+++ b/part4-miniuart/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -12,7 +12,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part5-framebuffer/Makefile.gcc b/part5-framebuffer/Makefile.gcc
index 89235e9..ae02b77 100644
--- a/part5-framebuffer/Makefile.gcc
+++ b/part5-framebuffer/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -12,7 +12,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part6-breakout/Makefile.gcc b/part6-breakout/Makefile.gcc
index 89235e9..ae02b77 100644
--- a/part6-breakout/Makefile.gcc
+++ b/part6-breakout/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -12,7 +12,7 @@ boot.o: boot.S
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES)
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part7-bluetooth/Makefile.gcc b/part7-bluetooth/Makefile.gcc
index 3ecc081..a22d069 100644
--- a/part7-bluetooth/Makefile.gcc
+++ b/part7-bluetooth/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -15,7 +15,7 @@ BCM4345C0.o : BCM4345C0.hcd
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES) BCM4345C0.o
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part8-breakout-ble/Makefile.gcc b/part8-breakout-ble/Makefile.gcc
index 3ecc081..a22d069 100644
--- a/part8-breakout-ble/Makefile.gcc
+++ b/part8-breakout-ble/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -15,7 +15,7 @@ BCM4345C0.o : BCM4345C0.hcd
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES) BCM4345C0.o
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part8-breakout-ble/Makefile.gcc.windows b/part8-breakout-ble/Makefile.gcc.windows
index 349a29b..ac37e4a 100644
--- a/part8-breakout-ble/Makefile.gcc.windows
+++ b/part8-breakout-ble/Makefile.gcc.windows
@@ -15,7 +15,7 @@ BCM4345C0.o : BCM4345C0.hcd
 	$(GCCPATH)\aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES) BCM4345C0.o
-	$(GCCPATH)\aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
+	$(GCCPATH)\aarch64-none-elf-ld -nostdlib boot.o $(OFILES) BCM4345C0.o -T link.ld -o kernel8.elf
 	$(GCCPATH)\aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean:
diff --git a/part9-sound/Makefile.gcc b/part9-sound/Makefile.gcc
index d5cc1f5..9fe0560 100644
--- a/part9-sound/Makefile.gcc
+++ b/part9-sound/Makefile.gcc
@@ -1,7 +1,7 @@
 CFILES = $(wildcard *.c)
 OFILES = $(CFILES:.c=.o)
 GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
-GCCPATH = ../../gcc-arm-9.2-2019.12-x86_64-aarch64-none-elf/bin
+GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
 
 all: clean kernel8.img
 
@@ -15,7 +15,7 @@ audio.o : audio.bin
 	$(GCCPATH)/aarch64-none-elf-gcc $(GCCFLAGS) -c $< -o $@
 
 kernel8.img: boot.o $(OFILES) audio.o
-	$(GCCPATH)/aarch64-none-elf-ld -nostdlib -nostartfiles boot.o $(OFILES) audio.o -T link.ld -o kernel8.elf
+	$(GCCPATH)/aarch64-none-elf-ld -nostdlib boot.o $(OFILES) audio.o -T link.ld -o kernel8.elf
 	$(GCCPATH)/aarch64-none-elf-objcopy -O binary kernel8.elf kernel8.img
 
 clean: