diff --git a/integration_tests/fixtures.py b/integration_tests/fixtures.py
index d1cc407..9142035 100644
--- a/integration_tests/fixtures.py
+++ b/integration_tests/fixtures.py
@@ -133,7 +133,7 @@ def wait_for_presto_coordinator(stream, timeout=30):
             time.sleep(5)
             return True
         if time.time() - t0 > timeout:
-            logger.error("coordinator took longer than {} to start".format(timeout))
+            logger.error("coordinator took longer than %s to start", timeout)
             raise TimeoutError
     return False
 
diff --git a/prestodb/__init__.py b/prestodb/__init__.py
index a209710..b620d16 100644
--- a/prestodb/__init__.py
+++ b/prestodb/__init__.py
@@ -20,4 +20,4 @@
 from . import exceptions
 from . import logging
 
-__version__ = "0.8.2"
+__version__ = "0.8.3"
diff --git a/prestodb/client.py b/prestodb/client.py
index c1cea7a..666451b 100644
--- a/prestodb/client.py
+++ b/prestodb/client.py
@@ -359,10 +359,8 @@ def post(self, sql):
             while http_response is not None and http_response.is_redirect:
                 location = http_response.headers["Location"]
                 url = self._redirect_handler.handle(location)
-                logger.info(
-                    "redirect {} from {} to {}".format(
+                logger.info("redirect % from % to %",
                         http_response.status_code, location, url
-                    )
                 )
                 http_response = self._post(
                     url,
@@ -412,7 +410,7 @@ def process(self, http_response):
 
         http_response.encoding = "utf-8"
         response = http_response.json()
-        logger.debug("HTTP {}: {}".format(http_response.status_code, response))
+        logger.debug("HTTP %s: %s", http_response.status_code, response)
         if "error" in response:
             raise self._process_error(response["error"], response.get("id"))
 
@@ -482,7 +480,7 @@ def __iter__(self):
             rows = self._query.fetch()
             for row in rows:
                 self._rownumber += 1
-                logger.debug("row {}".format(row))
+                logger.debug("row %s", row)
                 yield row
 
 
diff --git a/prestodb/exceptions.py b/prestodb/exceptions.py
index 198f54e..5308cd2 100644
--- a/prestodb/exceptions.py
+++ b/prestodb/exceptions.py
@@ -126,7 +126,7 @@ def decorated(*args, **kwargs):
                         handle_retry.retry(func, args, kwargs, err, attempt)
                         continue
                     break
-            logger.info("failed after {} attempts".format(attempt))
+            logger.info("failed after %s attempts", attempt)
             if error is not None:
                 raise error
             return result
diff --git a/prestodb/transaction.py b/prestodb/transaction.py
index 43a4b51..c1973a8 100644
--- a/prestodb/transaction.py
+++ b/prestodb/transaction.py
@@ -76,7 +76,7 @@ def begin(self):
                 self._id = response.headers[constants.HEADER_STARTED_TRANSACTION]
             status = self._request.process(response)
         self._request.transaction_id = self._id
-        logger.info("transaction started: " + self._id)
+        logger.info("transaction started: %s", self._id)
 
     def commit(self):
         query = prestodb.client.PrestoQuery(self._request, COMMIT)