diff --git a/DESCRIPTION b/DESCRIPTION
index f2dedff7..b4a180f3 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: slider
 Title: Sliding Window Functions
-Version: 0.2.0.9000
+Version: 0.2.1
 Authors@R: 
     c(person(given = "Davis",
              family = "Vaughan",
diff --git a/NEWS.md b/NEWS.md
index 96be60ff..9ab682f0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# slider (development version)
+# slider 0.2.1
 
 * Fixed a C alignment issue detected by CRAN's USBAN machine related to
   allocating vectors of `long double`.
diff --git a/cran-comments.md b/cran-comments.md
index 9f827f40..558157e7 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -9,6 +9,17 @@ We checked 5 reverse dependencies, comparing R CMD check results across CRAN and
  * We saw 0 new problems
  * We failed to check 0 packages
 
+## 0.2.1 Submission
+
+This is a patch release to fix:
+
+- Tests that were too strict with `long double`s, detected by CRAN's M1mac
+  and noLD machines.
+  
+- A C alignment issue when allocating vectors of `long double` and
+  `struct mean_state_t` (which uses `long double`), detected by CRAN's
+  gcc-USBAN machine.
+
 ## 0.2.0 Submission
 
 This release includes new specialized sliding variants, and better compatibility with vctrs classes.
diff --git a/revdep/README.md b/revdep/README.md
index c0561886..234f6818 100644
--- a/revdep/README.md
+++ b/revdep/README.md
@@ -10,13 +10,13 @@
 |collate  |en_US.UTF-8                  |
 |ctype    |en_US.UTF-8                  |
 |tz       |America/New_York             |
-|date     |2021-03-17                   |
+|date     |2021-03-22                   |
 
 # Dependencies
 
 |package |old   |new        |Δ  |
 |:-------|:-----|:----------|:--|
-|slider  |0.1.5 |0.1.5.9000 |*  |
+|slider  |0.2.0 |0.2.0.9000 |*  |
 
 # Revdeps