diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 6007ab715f8..73c1c546a1d 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -24,4 +24,4 @@ Describe what you expect the output to be. Knowing the correct behavior is also
 Provide any additional information here.
 
 #### Current Version:
-v2.22.0
+v2.22.1
diff --git a/RELEASE-NOTES.txt b/RELEASE-NOTES.txt
index 397acd8ccb5..bf20081f981 100644
--- a/RELEASE-NOTES.txt
+++ b/RELEASE-NOTES.txt
@@ -5,6 +5,11 @@ Note: these are the release notes for the stan-dev/stan repository.
 Further changes may arise at the interface level (stan-dev/{rstan,
 pystan, cmdstan}) and math library level (stan-dev/math).
 
+v.2.22.1 (31 January 2020)
+======================================================================
+
+Updated math version to v3.1.1
+
 v.2.22.0 (24 January 2020)
 ======================================================================
 
diff --git a/src/doxygen/doxygen.cfg b/src/doxygen/doxygen.cfg
index d25faaac8ad..f8adb2ea29d 100644
--- a/src/doxygen/doxygen.cfg
+++ b/src/doxygen/doxygen.cfg
@@ -38,7 +38,7 @@ PROJECT_NAME           = "Stan"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2.22.0
+PROJECT_NUMBER         = 2.22.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/src/stan/version.hpp b/src/stan/version.hpp
index 0823d893361..af873010523 100644
--- a/src/stan/version.hpp
+++ b/src/stan/version.hpp
@@ -13,7 +13,7 @@
 
 #define STAN_MAJOR 2
 #define STAN_MINOR 22
-#define STAN_PATCH 0
+#define STAN_PATCH 1
 
 namespace stan {