diff --git a/doc/build.py b/doc/build.py
index 22e734cab6a0..cb8d0c3c81ac 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -6,7 +6,7 @@
 from subprocess import check_call, check_output, CalledProcessError, Popen, PIPE
 from distutils.version import LooseVersion
 
-versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0']
+versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0']
 
 def pip_install(package, commit=None, **kwargs):
   "Install package using pip."
diff --git a/fmt/format.h b/fmt/format.h
index e13a08b91893..eccefed99ca7 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -43,7 +43,7 @@
 #undef FMT_INCLUDE
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 40001
+#define FMT_VERSION 40101
 
 #if defined(__has_include)
 # define FMT_HAS_INCLUDE(x) __has_include(x)