diff --git a/include/evmc/instructions.h b/include/evmc/instructions.h
index 1c22f848b..157226a8f 100644
--- a/include/evmc/instructions.h
+++ b/include/evmc/instructions.h
@@ -165,6 +165,9 @@ enum evmc_opcode
     OP_LOG3 = 0xa3,
     OP_LOG4 = 0xa4,
 
+    OP_DUPN = 0xb2,
+    OP_SWAPN = 0xb3,
+
     OP_CREATE = 0xf0,
     OP_CALL = 0xf1,
     OP_CALLCODE = 0xf2,
diff --git a/lib/instructions/instruction_metrics.c b/lib/instructions/instruction_metrics.c
index 059ba76f0..7c1f35137 100644
--- a/lib/instructions/instruction_metrics.c
+++ b/lib/instructions/instruction_metrics.c
@@ -213,8 +213,8 @@ static struct evmc_instruction_metrics cancun_metrics[256] = {
     /*                = 0xaf */ {UNDEFINED, 0, 0},
     /*                = 0xb0 */ {UNDEFINED, 0, 0},
     /*                = 0xb1 */ {UNDEFINED, 0, 0},
-    /*                = 0xb2 */ {UNDEFINED, 0, 0},
-    /*                = 0xb3 */ {UNDEFINED, 0, 0},
+    /*           DUPN = 0xb2 */ {VERYLOW, 0, 1},
+    /*          SWAPN = 0xb3 */ {VERYLOW, 0, 0},
     /*                = 0xb4 */ {UNDEFINED, 0, 0},
     /*                = 0xb5 */ {UNDEFINED, 0, 0},
     /*                = 0xb6 */ {UNDEFINED, 0, 0},
diff --git a/lib/instructions/instruction_names.c b/lib/instructions/instruction_names.c
index 64a21592d..6e21f0af9 100644
--- a/lib/instructions/instruction_names.c
+++ b/lib/instructions/instruction_names.c
@@ -183,8 +183,8 @@ static const char* cancun_names[256] = {
     /* 0xaf */ NULL,
     /* 0xb0 */ NULL,
     /* 0xb1 */ NULL,
-    /* 0xb2 */ NULL,
-    /* 0xb3 */ NULL,
+    /* 0xb2 */ "DUPN",
+    /* 0xb3 */ "SWAPN",
     /* 0xb4 */ NULL,
     /* 0xb5 */ NULL,
     /* 0xb6 */ NULL,