diff --git a/Dockerfile b/Dockerfile
index 6f5d5ef..d941c16 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:3.7-alpine
 
-RUN apk update && apk --no-cache add git
+RUN apk update && apk --no-cache add git gcc libc-dev libffi-dev
 
 COPY ./requirements.txt /app/requirements.txt
 
diff --git a/README.md b/README.md
index 5597b8b..cee53e7 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ In markdown, write code block as follows:
 
 And, you can refer specific lines as
 ```python:tests/src/sample.py [4-5]
- 
+
 ```
 ````
 
@@ -60,7 +60,7 @@ jobs:
         with:
           persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal token
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
-          ref: refs/heads/${{ github.head_ref }}
+          ref: ${{ github.head_ref }}
 
       - uses: tokusumi/markdown-embed-code@main
         with:
@@ -80,3 +80,4 @@ jobs:
 | no_change (Optional) | Issue comment at no changed (default: "No changes on README!" )         |
 | output (Optional)    | Output markdown file path. If none, override target file. (default: "") |
 | silent (Optional)    | No issue comment in silent mode (default: false)                        |
+| server (Optional)    | GitHub server URL (default: https://github.com)                         |
diff --git a/action.yaml b/action.yaml
index 0b5d1bf..249b55f 100644
--- a/action.yaml
+++ b/action.yaml
@@ -16,7 +16,7 @@ inputs:
   no_change:
     description: Issue comment at no changed
     required: false
-    default: "No changes on README!" 
+    default: "No changes on README!"
   output:
     description: Output markdown file path. If none, override target file.
     required: false
@@ -24,7 +24,11 @@ inputs:
   silent:
     description: "No issue comment in silent mode"
     required: false
-    default: false
+    default: "false"
+  server:
+    description: Github server URL
+    required: false
+    default: ${{ github.server_url || 'https://github.com' }}
 runs:
   using: docker
   image: Dockerfile
diff --git a/markdown_embed_code/__main__.py b/markdown_embed_code/__main__.py
index 25a3819..cb682c8 100644
--- a/markdown_embed_code/__main__.py
+++ b/markdown_embed_code/__main__.py
@@ -5,6 +5,7 @@
 
 from github import Github
 from pydantic import BaseModel, BaseSettings, SecretStr
+from urllib.parse import urlparse
 
 from markdown_embed_code import get_code_emb
 
@@ -16,8 +17,10 @@ class Settings(BaseSettings):
     input_output: Path = Path("")
     input_silent: bool = False
     input_token: SecretStr
+    input_server: str
     github_actor: str
     github_repository: str
+    github_event_name: str
     github_event_path: Path
 
 
@@ -26,6 +29,7 @@ class PartialGitHubEventInputs(BaseModel):
 
 
 class PartialGitHubEvent(BaseModel):
+    ref: Optional[str] = None
     number: Optional[int] = None
     inputs: Optional[PartialGitHubEventInputs] = None
 
@@ -36,29 +40,39 @@ class PartialGitHubEvent(BaseModel):
     ["git", "config", "--local", "user.email", "github-actions@github.com"], check=True
 )
 
-
-g = Github(settings.input_token.get_secret_value())
+g = Github(base_url=f"{settings.input_server}/api/v3", login_or_token=settings.input_token.get_secret_value())
 repo = g.get_repo(settings.github_repository)
 if not settings.github_event_path.is_file():
     sys.exit(1)
 contents = settings.github_event_path.read_text()
 event = PartialGitHubEvent.parse_raw(contents)
-if event.number is not None:
-    number = event.number
-elif event.inputs and event.inputs.number:
-    number = event.inputs.number
-else:
-    sys.exit(1)
-pr = repo.get_pull(number)
-if pr.merged:
-    # ignore at merged
+
+ref = None
+
+if settings.github_event_name == 'pull_request':
+    if event.number is not None:
+        number = event.number
+    elif event.inputs and event.inputs.number:
+        number = event.inputs.number
+    else:
+        sys.exit(1)
+
+    pr = repo.get_pull(number)
+    if pr.merged:
+        # ignore at merged
+        sys.exit(0)
+    ref = pr.head.ref
+elif settings.github_event_name == 'push':
+    ref = event.ref
+
+if not ref:
+    print('unknown ref', ref)
     sys.exit(0)
 
 if not settings.input_output.is_dir():
     output_path = settings.input_output
 else:
     output_path = settings.input_markdown
-
 with open(settings.input_markdown, "r") as f:
     doc = f.read()
 
@@ -81,7 +95,7 @@ class PartialGitHubEvent(BaseModel):
 subprocess.run(["git", "add", output_path], check=True)
 subprocess.run(["git", "commit", "-m", settings.input_message], check=True)
 
-remote_repo = f"https://{settings.github_actor}:{settings.input_token.get_secret_value()}@github.com/{settings.github_repository}.git"
-proc = subprocess.run(["git", "push", remote_repo, f"HEAD:{pr.head.ref}"], check=False)
+remote_repo = f"https://{settings.github_actor}:{settings.input_token.get_secret_value()}@{urlparse(settings.input_server).hostname}/{settings.github_repository}.git"
+proc = subprocess.run(["git", "push", remote_repo, f"HEAD:{ref}"], check=False)
 if proc.returncode != 0:
     sys.exit(1)