diff --git a/src/avrdude.conf.in b/src/avrdude.conf.in
index f9b6d163..02c29168 100644
--- a/src/avrdude.conf.in
+++ b/src/avrdude.conf.in
@@ -3360,6 +3360,20 @@ serialadapter # ch340
     usbpid                 = 0x7523;
 ;
 
+#------------------------------------------------------------
+# ch342
+#------------------------------------------------------------
+
+# Dual serial port chip
+# https://www.wch-ic.com/products/CH342.html
+
+serialadapter # ch342
+    id                     = "ch342";
+    desc                   = "WCH CH342 USB to serial adapter";
+    usbvid                 = 0x1a86;
+    usbpid                 = 0x55d2;
+;
+
 #------------------------------------------------------------
 # ch343
 #------------------------------------------------------------
@@ -3373,6 +3387,34 @@ serialadapter # ch343
     usbpid                 = 0x55d3;
 ;
 
+#------------------------------------------------------------
+# ch344
+#------------------------------------------------------------
+
+# Quad serial port chip
+# https://www.wch-ic.com/products/CH344.html
+
+serialadapter # ch344
+    id                     = "ch344";
+    desc                   = "WCH CH344 USB to serial adapter";
+    usbvid                 = 0x1a86;
+    usbpid                 = 0x55d5;
+;
+
+#------------------------------------------------------------
+# ch347
+#------------------------------------------------------------
+
+# Multipurpose interface chip
+# https://www.wch-ic.com/products/CH347.html
+
+serialadapter # ch347
+    id                     = "ch347";
+    desc                   = "WCH CH347 USB to serial adapter";
+    usbvid                 = 0x1a86;
+    usbpid                 = 0x55da, 0x55db, 0x55dd, 0x55de;
+;
+
 #------------------------------------------------------------
 # ch9102
 #------------------------------------------------------------
@@ -3384,6 +3426,20 @@ serialadapter # ch9102
     usbpid                 = 0x55d4;
 ;
 
+#------------------------------------------------------------
+# ch9103
+#------------------------------------------------------------
+
+# Dual serial port chip
+# https://www.wch-ic.com/products/CH9103.html
+
+serialadapter # ch9103
+    id                     = "ch9103";
+    desc                   = "WCH CH9103 USB to serial adapter";
+    usbvid                 = 0x1a86;
+    usbpid                 = 0x55d7;
+;
+
 #------------------------------------------------------------
 # cp210x
 #------------------------------------------------------------