diff --git a/.github/.release-please-manifest.json b/.github/.release-please-manifest.json
index 6b7b74c..cce9240 100644
--- a/.github/.release-please-manifest.json
+++ b/.github/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.3.0"
+  ".": "0.3.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7200148..34f06a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.3.1](https://github.com/rpl-cmu/fact-rs/compare/v0.3.0...v0.3.1) (2026-05-22)
+
+
+### Features
+
+* Require Send for Graph and Factor ([#47](https://github.com/rpl-cmu/fact-rs/issues/47)) ([befb5b9](https://github.com/rpl-cmu/fact-rs/commit/befb5b954627b6fa719d05aace191aa6c680a7ab))
+
 ## [0.3.0](https://github.com/rpl-cmu/fact-rs/compare/v0.2.0...v0.3.0) (2026-03-20)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index 7248bef..432144b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1253,7 +1253,7 @@ dependencies = [
 
 [[package]]
 name = "factrs"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "downcast-rs",
  "dyn-clone",
@@ -1279,7 +1279,7 @@ dependencies = [
 
 [[package]]
 name = "factrs-bench"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "diol",
  "factrs",
@@ -1296,7 +1296,7 @@ dependencies = [
 
 [[package]]
 name = "factrs-proc"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 18db66c..2a5f8af 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "factrs"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2024"
 license = "MIT"
 description = "Factor graph optimization for robotics"
@@ -43,7 +43,7 @@ downcast-rs = "2.0.1"
 log = "0.4.22"
 pad-adapter = "0.1.1"
 dyn-clone = "1.0.17"
-factrs-proc = { version = "0.3.0", path = "./factrs-proc" }
+factrs-proc = { version = "0.3.1", path = "./factrs-proc" }
 
 # numerical 
 faer.workspace = true
diff --git a/factrs-bench/Cargo.toml b/factrs-bench/Cargo.toml
index 519dd07..091a205 100644
--- a/factrs-bench/Cargo.toml
+++ b/factrs-bench/Cargo.toml
@@ -1,12 +1,12 @@
 [package]
 name = "factrs-bench"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 
 [dependencies]
 faer.workspace = true
 nalgebra.workspace = true
-factrs = { version = "0.3.0", path = ".." }
+factrs = { version = "0.3.1", path = ".." }
 pretty_env_logger = "0.5.0"
 rayon = "1.10.0"
 
diff --git a/factrs-proc/Cargo.toml b/factrs-proc/Cargo.toml
index 7a5b94f..021e4cc 100644
--- a/factrs-proc/Cargo.toml
+++ b/factrs-proc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "factrs-proc"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 license = "MIT"
 description = "Proc-macros for factrs"