diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index abb13784..d362297f 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.6.4
+current_version = 0.6.5-dev
 commit = True
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(?:-(?P<release>[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+(?P<build>[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 2b1d91c4..a5e97cbe 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -27,7 +27,7 @@
 author = "Charles Tapley Hoyt"
 
 # The full version, including alpha/beta/rc tags.
-release = "0.6.4"
+release = "0.6.5-dev"
 
 # The short X.Y version.
 parsed_version = re.match(
diff --git a/setup.cfg b/setup.cfg
index 32eb73ec..453f207d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 ##########################
 [metadata]
 name = curies
-version = 0.6.4
+version = 0.6.5-dev
 description = Idiomatic conversion between URIs and compact URIs (CURIEs).
 long_description = file: README.md
 long_description_content_type = text/markdown
diff --git a/src/curies/version.py b/src/curies/version.py
index 4d0d74bf..e6e2fb1c 100644
--- a/src/curies/version.py
+++ b/src/curies/version.py
@@ -7,7 +7,7 @@
     "get_version",
 ]
 
-VERSION = "0.6.4"
+VERSION = "0.6.5-dev"
 
 
 def get_version() -> str: