diff --git a/filtermail/CHANGELOG.md b/filtermail/CHANGELOG.md
index 927801a9..b16550a1 100644
--- a/filtermail/CHANGELOG.md
+++ b/filtermail/CHANGELOG.md
@@ -1,3 +1,17 @@
+## 0.6.6 - 2026-05-12
+
+### Bug Fixes
+
+- Return HTTP 200 because madmail expects it, and make sure https is immediately retried when SMTP fails (#153)
+
+### Features
+
+- Improved SMTP error responses (#147)
+
+### Miscellaneous Tasks
+
+- Remove mac and windows from matrix tests (#154)
+- Run cmlxc tests in all classic/classic-ipv4/madmail combinations
 ## 0.6.5 - 2026-05-12
 
 ### Bug Fixes
diff --git a/filtermail/Cargo.lock b/filtermail/Cargo.lock
index 5a2b6d46..904ad901 100644
--- a/filtermail/Cargo.lock
+++ b/filtermail/Cargo.lock
@@ -508,7 +508,7 @@ checksum = "28dea519a9695b9977216879a3ebfddf92f1c08c05d984f8996aecd6ecdc811d"
 
 [[package]]
 name = "filtermail"
-version = "0.6.5"
+version = "0.6.6"
 dependencies = [
  "async-trait",
  "base64",
diff --git a/filtermail/Cargo.toml b/filtermail/Cargo.toml
index aeed8746..080ad35f 100644
--- a/filtermail/Cargo.toml
+++ b/filtermail/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "filtermail"
-version = "0.6.5"
+version = "0.6.6"
 edition = "2024"
 license = "MIT"
 readme = "README.md"