diff --git a/digdag-docs/src/operators/sh.md b/digdag-docs/src/operators/sh.md
index 5c37a4b24b..bdde105e25 100644
--- a/digdag-docs/src/operators/sh.md
+++ b/digdag-docs/src/operators/sh.md
@@ -33,7 +33,23 @@ The shell defaults to `/bin/sh`. If an alternate shell such as `zsh` is desired,
     +step1:
       sh>: tasks/step2.sh
 
-On Windows, you can set PowerShell.exe to the `shell` option:
+On Windows, you can set PowerShell.exe to the `shell` option.
+Since ver.0.10.6, it is correct to specify ["powershell.exe"], 
+but digdag works with ["powershell.exe", "-"] in ver.0.9.46
+or earlier.
+
+>= 0.10.6
+    _export:
+      sh:
+        shell: ["powershell.exe"]
+
+    +step1:
+      sh>: step1.exe
+
+    +step2:
+      sh>: step2.ps1
+
+<= 0.9.46
 
     _export:
       sh:
diff --git a/digdag-standards/src/main/java/io/digdag/standards/operator/ShOperatorFactory.java b/digdag-standards/src/main/java/io/digdag/standards/operator/ShOperatorFactory.java
index aec2de7872..f8ad15aff3 100644
--- a/digdag-standards/src/main/java/io/digdag/standards/operator/ShOperatorFactory.java
+++ b/digdag-standards/src/main/java/io/digdag/standards/operator/ShOperatorFactory.java
@@ -128,28 +128,42 @@ private void runCode(final Config state)
             }
         }
 
+        private List<String> getShell(final Config params, final Boolean winOS){
+            // Until digdag ver. 0.9, it was necessary to write ["powershell.exe","-"] to specify shell, 
+            // but since ver. 0.10, jobs are not executed unless ["powershell.exe"] is written.
+            // To cope with the sudden incompatibility, change the shell specification ["powershell.exe","-"]
+            // to ["powershell.exe"].
+            // In addition, a deprecation message is output. This conversion will be removed in the future.
+            List<String> temp_shell;
+            if (params.has("shell")) {
+                temp_shell = params.getListOrEmpty("shell", String.class);
+                if (temp_shell.get(0).toLowerCase().equals("powershell.exe") && temp_shell.size() == 2){
+                    if (temp_shell.get(1).equals("-")){
+                        temp_shell.remove(1);
+                        logger.info("Removed \"-\" from shell specification --- from [\"powershell.exe\",\"-\"] to [\"powershell.exe\"] .");
+                    }
+                }
+            }
+            else {
+                temp_shell = ImmutableList.of(winOS ? "PowerShell.exe" : "/bin/sh");
+            }
+            return temp_shell;
+        }
+
         private CommandStatus runCommand(final Config params, final CommandContext commandContext)
                 throws IOException, InterruptedException
         {
             final Path tempDir = workspace.createTempDir(String.format("digdag-sh-%d-", request.getTaskId()));
             final Path workingDirectory = workspace.getPath(); // absolute
-            final Path runnerPath = tempDir.resolve("runner.sh"); // absolute
+            final Boolean winOS = isWindowsPlatform();
+            final Path runnerPath = tempDir.resolve(winOS ? "runner.ps1" : "runner.sh"); // absolute
 
-            final List<String> shell;
-            if (params.has("shell")) {
-                shell = params.getListOrEmpty("shell", String.class);
-            }
-            else {
-                shell = ImmutableList.of("/bin/sh");
-            }
+            final List<String> shell = getShell(params, winOS);
 
             final ImmutableList.Builder<String> cmdline = ImmutableList.builder();
-            if (params.has("shell")) {
-                cmdline.addAll(shell);
-            }
-            else {
-                cmdline.addAll(shell);
-            }
+
+            cmdline.addAll(shell);
+
             cmdline.add(workingDirectory.relativize(runnerPath).toString()); // relative
 
             final String shScript = UserSecretTemplate.of(params.get("_command", String.class))
@@ -223,5 +237,14 @@ private CommandRequest buildCommandRequest(final CommandContext commandContext,
                     .ioDirectory(ioDirectory)
                     .build();
         }
+
+        private boolean isWindowsPlatform()
+        {
+            final String os = System.getProperty("os.name").toLowerCase();
+            if ( os.startsWith("windows")) {
+                return true;
+            }
+            return false;
+        }
     }
 }