diff --git a/bricks/r13n/CHANGELOG.md b/bricks/r13n/CHANGELOG.md
index 1d95371..f1a2ccd 100644
--- a/bricks/r13n/CHANGELOG.md
+++ b/bricks/r13n/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.1.0-dev.9 
+
+- chore: bump environment mason constraint ([#79](https://github.com/VeryGoodOpenSource/r13n/pull/79))
+
 # 0.1.0-dev.8
 
 - refactor: decompose hooks into multiple files ([#43](https://github.com/VeryGoodOpenSource/r13n/pull/43))
diff --git a/bricks/r13n/brick.yaml b/bricks/r13n/brick.yaml
index ce28ca3..12e11b3 100644
--- a/bricks/r13n/brick.yaml
+++ b/bricks/r13n/brick.yaml
@@ -2,7 +2,7 @@ name: r13n
 description: A brick that generates regionalization (r13n) code from arb files. Built by Very Good Ventures.
 repository: https://github.com/VeryGoodOpenSource/r13n
 
-version: 0.1.0-dev.8
+version: 0.1.0-dev.9
 
 environment:
   mason: ">=0.1.0-dev.28 <0.2.0"