diff --git a/.gitignore b/.gitignore
index 6ae333e5..c28366ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,5 @@ coverage.xml
 dist/
 docs/_build/
 htmlcov/
+
+.idea/
diff --git a/graphql_jwt/settings.py b/graphql_jwt/settings.py
index d7257b22..6af4ceee 100644
--- a/graphql_jwt/settings.py
+++ b/graphql_jwt/settings.py
@@ -59,6 +59,7 @@
     "JWT_GET_REFRESH_TOKEN_HANDLER",
     "JWT_ALLOW_ANY_HANDLER",
     "JWT_ALLOW_ANY_CLASSES",
+    "JWT_PUBLIC_KEY",
 )
 
 
@@ -103,6 +104,9 @@ def __getattr__(self, attr):
         if attr in self.import_strings:
             value = perform_import(value, attr)
 
+            if attr == "JWT_PUBLIC_KEY" and value is not None and callable(value):
+                value = value()
+
         self._cached_attrs.add(attr)
         setattr(self, attr, value)
         return value
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 21177c6a..8fc66bfe 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -10,6 +10,12 @@
 from .decorators import override_jwt_settings
 from .testcases import TestCase
 
+PRIVATE_KEY = rsa.generate_private_key(
+    public_exponent=65537,
+    key_size=2048,
+    backend=default_backend(),
+)
+
 
 class JWTPayloadTests(TestCase):
     @mock.patch(
@@ -35,20 +41,34 @@ def test_issuer(self):
 
 class AsymmetricAlgorithmsTests(TestCase):
     def test_rsa_jwt(self):
-        private_key = rsa.generate_private_key(
-            public_exponent=65537,
-            key_size=2048,
-            backend=default_backend(),
-        )
-        public_key = private_key.public_key()
+        public_key = PRIVATE_KEY.public_key()
         payload = utils.jwt_payload(self.user)
 
         with override_jwt_settings(
             JWT_PUBLIC_KEY=public_key,
-            JWT_PRIVATE_KEY=private_key,
+            JWT_PRIVATE_KEY=PRIVATE_KEY,
             JWT_ALGORITHM="RS256",
         ):
+            token = utils.jwt_encode(payload)
+            decoded = utils.jwt_decode(token)
+
+        self.assertEqual(payload, decoded)
+
+
+def get_rsa_jwt():
+    public_key = PRIVATE_KEY.public_key()
+    return public_key
 
+
+class PublicKeyImportStringTest(TestCase):
+    def test_import_string_public_key(self):
+        payload = utils.jwt_payload(self.user)
+
+        with override_jwt_settings(
+            JWT_PRIVATE_KEY=PRIVATE_KEY,
+            JWT_PUBLIC_KEY="tests.test_utils.get_rsa_jwt",
+            JWT_ALGORITHM="RS256",
+        ):
             token = utils.jwt_encode(payload)
             decoded = utils.jwt_decode(token)