diff --git a/CHANGES.rst b/CHANGES.rst
index 2e16731..09255b7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,11 @@
 Changes
 =======
 
+Version v1.1.1 (released 2021-04-20):
+
+- Fixes DataCiteRESTClient attributes' type. Prefix, username and password
+  are always cast to string.
+
 Version v1.1.0 (released 2021-04-15):
 
 - Adds full support for DataCite Metadata Schema v4.2 and v4.3 XML generation.
diff --git a/datacite/version.py b/datacite/version.py
index 5c7d226..fb85742 100644
--- a/datacite/version.py
+++ b/datacite/version.py
@@ -20,4 +20,4 @@
 # Do not change the format of this next line. Doing so risks breaking
 # setup.py and docs/conf.py
 
-__version__ = "1.1.0"
+__version__ = "1.1.1"