diff --git a/.github/workflows/test_s390x.yaml b/.github/workflows/test_s390x.yaml
index abd2733..80e5126 100644
--- a/.github/workflows/test_s390x.yaml
+++ b/.github/workflows/test_s390x.yaml
@@ -14,7 +14,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.19.x]
+        go-version: [1.22.x]
         arch: [s390x]  
     runs-on: ubuntu-latest
     steps:
diff --git a/cipher/gcm_s390x.s b/cipher/gcm_s390x.s
index 70c9ed0..658c8b5 100644
--- a/cipher/gcm_s390x.s
+++ b/cipher/gcm_s390x.s
@@ -18,7 +18,7 @@ TEXT ·ghash(SB),NOSPLIT,$32-40
 	STMG	R4, R7, (R1)
 	LMG	data+16(FP), R2, R3 // R2=base, R3=len
 loop:
-	WORD    $0xB93E0002 // compute intermediate message digest (KIMD)
+	KIMD	R0, R2      // compute intermediate message digest (KIMD)
 	BVS     loop        // branch back if interrupted
 	MVC     $16, (R1), (R8)
 	MOVD	$0, R0