diff --git a/VERSION b/VERSION
index 858efdc7..641fc72d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.644
+8.3.645
diff --git a/plot/plotVers.c b/plot/plotVers.c
index 5eab30dd..fed4d522 100644
--- a/plot/plotVers.c
+++ b/plot/plotVers.c
@@ -1218,7 +1218,7 @@ PlotVersatec(scx, layers, xMask, user_scale)
 
     /* Compute the name of the file to use for output, and open it. */
 
-    sprintf(fileName, "%s/magicPlotXXXXXX", PlotTempDirectory);
+    snprintf(fileName, 200, "%s/magicPlotXXXXXX", PlotTempDirectory);
     result = mkstemp(fileName);
     if (result == -1)
     {
@@ -1474,7 +1474,7 @@ PlotVersatec(scx, layers, xMask, user_scale)
 
     TxPrintf("\n");
     fclose(file);
-    sprintf(command, PlotVersCommand, PlotVersPrinter, fileName);
+    snprintf(command, 300, PlotVersCommand, PlotVersPrinter, fileName);
     if (system(command) != 0)
     {
 	TxError("Couldn't execute spooler command to print \"%s\"\n",