diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7e45a84..ee8c6b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     container:
       image: devkitpro/devkitppc:latest
     env:
-      GRRLIBVERS: 4.5.0
+      GRRLIBVERS: 4.5.1
 
     steps:
 
diff --git a/GRRMOD/mikmod/include/mikmod.h b/GRRMOD/mikmod/include/mikmod.h
index f26e154..c0097df 100644
--- a/GRRMOD/mikmod/include/mikmod.h
+++ b/GRRMOD/mikmod/include/mikmod.h
@@ -250,14 +250,14 @@ enum {
     MMERR_MAC_SPEED,
     MMERR_MAC_START,
 
-    MMERR_OSX_UNKNOWN_DEVICE,
-    MMERR_OSX_BAD_PROPERTY,
+    MMERR_OSX_UNKNOWN_DEVICE, /* obsolete */
+    MMERR_OSX_BAD_PROPERTY,   /* obsolete */
     MMERR_OSX_UNSUPPORTED_FORMAT,
-    MMERR_OSX_SET_STEREO,
-    MMERR_OSX_BUFFER_ALLOC,
-    MMERR_OSX_ADD_IO_PROC,
+    MMERR_OSX_SET_STEREO,     /* obsolete */
+    MMERR_OSX_BUFFER_ALLOC,   /* obsolete */
+    MMERR_OSX_ADD_IO_PROC,    /* obsolete */
     MMERR_OSX_DEVICE_START,
-    MMERR_OSX_PTHREAD,
+    MMERR_OSX_PTHREAD,        /* obsolete */
 
     MMERR_DOSWSS_STARTDMA,
     MMERR_DOSSB_STARTDMA,
diff --git a/GRRMOD/mikmod/mmio/mmerror.c b/GRRMOD/mikmod/mmio/mmerror.c
index cf4c99e..e8e4db8 100644
--- a/GRRMOD/mikmod/mmio/mmerror.c
+++ b/GRRMOD/mikmod/mmio/mmerror.c
@@ -202,14 +202,14 @@ static const char *_mm_errmsg[MMERR_MAX+1] =
 
 /* MacOS X/Darwin driver errors */
 #ifdef DRV_OSX
-	"Unknown device",
-	"Bad property",
+	_mmerr_invalid,
+	_mmerr_invalid,
 	"Could not set playback format",
-	"Could not set mono/stereo setting",
-	"Could not create playback buffers",
-	"Could not create playback thread",
+	_mmerr_invalid,
+	_mmerr_invalid,
+	_mmerr_invalid,
 	"Could not start audio device",
-	"Could not create buffer thread",
+	_mmerr_invalid,
 #else
 	_mmerr_invalid, _mmerr_invalid, _mmerr_invalid,
 	_mmerr_invalid, _mmerr_invalid, _mmerr_invalid,