diff --git a/src/main_gpumd/main.cu b/src/main_gpumd/main.cu
index e27ce98ab..2227d2168 100644
--- a/src/main_gpumd/main.cu
+++ b/src/main_gpumd/main.cu
@@ -59,7 +59,7 @@ void print_welcome_information(void)
   printf("***************************************************************\n");
   printf("*                 Welcome to use GPUMD                        *\n");
   printf("*     (Graphics Processing Units Molecular Dynamics)          *\n");
-  printf("*                    Version 3.9.2                            *\n");
+  printf("*                    Version 3.9.3                            *\n");
   printf("*              This is the gpumd executable                   *\n");
   printf("***************************************************************\n");
   printf("\n");
diff --git a/src/main_nep/main.cu b/src/main_nep/main.cu
index fdc917e18..db53a3f92 100644
--- a/src/main_nep/main.cu
+++ b/src/main_nep/main.cu
@@ -70,7 +70,7 @@ void print_welcome_information(void)
   printf("***************************************************************\n");
   printf("*                 Welcome to use GPUMD                        *\n");
   printf("*    (Graphics Processing Units Molecular Dynamics)           *\n");
-  printf("*                    Version 3.9.2                            *\n");
+  printf("*                    Version 3.9.3                            *\n");
   printf("*              This is the nep executable                     *\n");
   printf("***************************************************************\n");
   printf("\n");
diff --git a/src/measure/dump_piston.cu b/src/measure/dump_piston.cu
index c148790b8..058419029 100644
--- a/src/measure/dump_piston.cu
+++ b/src/measure/dump_piston.cu
@@ -35,7 +35,6 @@ static __device__ __inline__ double atomicAdd(double* address, double val)
 
 static __global__ void gpu_com(
   int N,
-  int bins,
   int avg_window,
   double* g_mass,
   double* g_x,
@@ -75,7 +74,6 @@ static __global__ void gpu_calc1(
 
 static __global__ void gpu_thermo(
   int N,
-  int bins,
   double avg_window,
   double* g_x,
   double* g_mass,
@@ -231,7 +229,6 @@ void Dump_Piston::process(Atom& atom, Box& box, const int step)
   // calculate COM velocity first
   gpu_com<<<(n - 1) / 128 + 1, 128>>>(
     n,
-    bins,
     avg_window,
     atom.mass.data(),
     atom.position_per_atom.data() + direction * n,
@@ -247,7 +244,6 @@ void Dump_Piston::process(Atom& atom, Box& box, const int step)
   // get spatial thermo info
   gpu_thermo<<<(n - 1) / 128 + 1, 128>>>(
     n,
-    bins,
     avg_window,
     atom.position_per_atom.data() + direction * n,
     atom.mass.data(),