diff --git a/CHANGELOG.md b/CHANGELOG.md
index 162353b..b68c07a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# v0.1.21
+
+- **Added** Identify the tool via User-Agent
+
 # v0.1.18
 
 - **Added** `--web` flag for `brief` subcommand
diff --git a/Cargo.toml b/Cargo.toml
index d77865c..ec17329 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "aocf"
-version = "0.1.20"
+version = "0.1.21"
 authors = ["Ed Cragg <ed@eipi.xyz>"]
 edition = "2018"
 license = "ISC"
diff --git a/aocf_cli/Cargo.lock b/aocf_cli/Cargo.lock
index a0537f2..e6ce6a9 100644
--- a/aocf_cli/Cargo.lock
+++ b/aocf_cli/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "aocf"
-version = "0.1.20"
+version = "0.1.21"
 dependencies = [
  "atty",
  "clap",
@@ -31,7 +31,7 @@ dependencies = [
 
 [[package]]
 name = "aocf_cli"
-version = "0.1.20"
+version = "0.1.21"
 dependencies = [
  "aocf",
  "chrono",
diff --git a/aocf_cli/Cargo.toml b/aocf_cli/Cargo.toml
index 947b2cd..e865ea5 100644
--- a/aocf_cli/Cargo.toml
+++ b/aocf_cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "aocf_cli"
-version = "0.1.20"
+version = "0.1.21"
 authors = ["Ed Cragg <ed@eipi.xyz>"]
 edition = "2018"
 license = "ISC"