diff --git a/libopencm3 b/libopencm3
index ea6a5a7..72274d3 160000
--- a/libopencm3
+++ b/libopencm3
@@ -1 +1 @@
-Subproject commit ea6a5a7efd5e83b6a7e2b55506acbc863a6d0c34
+Subproject commit 72274d3caf09a5b4a6646e65bf376c91b8fa2ef1
diff --git a/src/i2c-explorer/i2c-explorer.c b/src/i2c-explorer/i2c-explorer.c
index 4d34626..8c7d069 100644
--- a/src/i2c-explorer/i2c-explorer.c
+++ b/src/i2c-explorer/i2c-explorer.c
@@ -347,7 +347,7 @@ static void i2c_init(void)
 
 int main(void)
 {
-	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_120MHZ]);
+        rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
 
 	i2c_init();
 	time_init();
diff --git a/src/i2c-stm32f4-usb/i2c-stm32f4-usb.c b/src/i2c-stm32f4-usb/i2c-stm32f4-usb.c
index f8da51e..bd6b796 100644
--- a/src/i2c-stm32f4-usb/i2c-stm32f4-usb.c
+++ b/src/i2c-stm32f4-usb/i2c-stm32f4-usb.c
@@ -362,7 +362,7 @@ int main(void)
 {
 	int i;
 
-	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_120MHZ]);
+        rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
 
 	rcc_periph_clock_enable(RCC_GPIOA);
 	rcc_periph_clock_enable(RCC_GPIOB);