diff --git a/infra/docker-compose.yml b/infra/docker-compose.yml
index dcced8bd..a4cf04c7 100644
--- a/infra/docker-compose.yml
+++ b/infra/docker-compose.yml
@@ -106,7 +106,7 @@ services:
       - '9000:9000' # web interface
       - '1100:1100' # POP3
   db:
-    image: supabase/postgres:latest
+    image: supabase/postgres:15.1.1.66
     ports:
       - '5432:5432'
     command: postgres -c config_file=/etc/postgresql/postgresql.conf
diff --git a/supabase_auth/_async/gotrue_client.py b/supabase_auth/_async/gotrue_client.py
index 3e93d005..1fe60de7 100644
--- a/supabase_auth/_async/gotrue_client.py
+++ b/supabase_auth/_async/gotrue_client.py
@@ -61,9 +61,11 @@
     Options,
     Provider,
     Session,
+    SignInAnonymouslyCredentials,
     SignInWithOAuthCredentials,
     SignInWithPasswordCredentials,
     SignInWithPasswordlessCredentials,
+    SignInWithSSOCredentials,
     SignOutOptions,
     SignUpWithPasswordCredentials,
     Subscription,
@@ -149,6 +151,34 @@ async def initialize_from_url(self, url: str) -> None:
 
     # Public methods
 
+    async def sign_in_anonymously(
+        self, credentials: Union[SignInAnonymouslyCredentials, None] = None
+    ) -> AuthResponse:
+        """
+        Creates a new anonymous user.
+        """
+        self._remove_session()
+        if credentials is None:
+            credentials = {"options": {}}
+        options = credentials.get("options", {})
+        data = options.get("data") or {}
+        captcha_token = options.get("captcha_token")
+        response = self._request(
+            "POST",
+            "signup",
+            body={
+                "data": data,
+                "gotrue_meta_security": {
+                    "captcha_token": captcha_token,
+                },
+            },
+            xform=parse_auth_response,
+        )
+        if response.session:
+            self._save_session(response.session)
+            self._notify_all_subscribers("SIGNED_IN", response.session)
+        return response
+
     async def sign_up(
         self,
         credentials: SignUpWithPasswordCredentials,
diff --git a/supabase_auth/_sync/gotrue_client.py b/supabase_auth/_sync/gotrue_client.py
index ec8e22f3..6a8c764f 100644
--- a/supabase_auth/_sync/gotrue_client.py
+++ b/supabase_auth/_sync/gotrue_client.py
@@ -61,9 +61,11 @@
     Options,
     Provider,
     Session,
+    SignInAnonymouslyCredentials,
     SignInWithOAuthCredentials,
     SignInWithPasswordCredentials,
     SignInWithPasswordlessCredentials,
+    SignInWithSSOCredentials,
     SignOutOptions,
     SignUpWithPasswordCredentials,
     Subscription,
@@ -149,6 +151,34 @@ def initialize_from_url(self, url: str) -> None:
 
     # Public methods
 
+    def sign_in_anonymously(
+        self, credentials: Union[SignInAnonymouslyCredentials, None] = None
+    ) -> AuthResponse:
+        """
+        Creates a new anonymous user.
+        """
+        self._remove_session()
+        if credentials is None:
+            credentials = {"options": {}}
+        options = credentials.get("options", {})
+        data = options.get("data") or {}
+        captcha_token = options.get("captcha_token")
+        response = self._request(
+            "POST",
+            "signup",
+            body={
+                "data": data,
+                "gotrue_meta_security": {
+                    "captcha_token": captcha_token,
+                },
+            },
+            xform=parse_auth_response,
+        )
+        if response.session:
+            self._save_session(response.session)
+            self._notify_all_subscribers("SIGNED_IN", response.session)
+        return response
+
     def sign_up(
         self,
         credentials: SignUpWithPasswordCredentials,
diff --git a/supabase_auth/types.py b/supabase_auth/types.py
index ee260b04..53877eba 100644
--- a/supabase_auth/types.py
+++ b/supabase_auth/types.py
@@ -348,6 +348,15 @@ class SignInWithSSOOptions(TypedDict):
     skip_http_redirect: NotRequired[bool]
 
 
+class SignInAnonymouslyCredentials(TypedDict):
+    options: NotRequired[SignInAnonymouslyCredentialsOptions]
+
+
+class SignInAnonymouslyCredentialsOptions(TypedDict):
+    data: NotRequired[Any]
+    captcha_token: NotRequired[str]
+
+
 class VerifyOtpParamsOptions(TypedDict):
     redirect_to: NotRequired[str]
     captcha_token: NotRequired[str]