diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d5f6198..d021aa8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,8 @@ jobs:
     name: Validation
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
     runs-on: ubuntu-latest
+    env:
+      SSHDOL_SYNC_TO_EXTRA_SSH_OPTIONS: "-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null"
     strategy:
       matrix:
         python-version: ["3.10"]
diff --git a/sshdol/base.py b/sshdol/base.py
index 92a6780..beced85 100644
--- a/sshdol/base.py
+++ b/sshdol/base.py
@@ -771,6 +771,13 @@ def sync_to(
         ssh_parts = ["ssh", "-p", str(self._conn_port)]
         if self._conn_key_filename:
             ssh_parts += ["-i", self._conn_key_filename]
+        
+        # Add extra SSH options from environment variable if set
+        # This allows CI environments or users to specify additional SSH options
+        extra_ssh_options = os.environ.get('SSHDOL_SYNC_TO_EXTRA_SSH_OPTIONS')
+        if extra_ssh_options:
+            # Split the string into individual options, handling quoted arguments properly
+            ssh_parts += shlex.split(extra_ssh_options)
         ssh_cmd_str = " ".join(shlex.quote(p) for p in ssh_parts)
 
         # Build rsync args