Eppo-exp · dd-oleksii · Jan 7, 2026 · Jan 7, 2026
diff --git a/.changeset/calm-pumas-retire.md b/.changeset/calm-pumas-retire.md
diff --git a/.changeset/chatty-books-count.md b/.changeset/chatty-books-count.md
diff --git a/.changeset/clever-ties-tie.md b/.changeset/clever-ties-tie.md
diff --git a/.changeset/cuddly-turtles-develop.md b/.changeset/cuddly-turtles-develop.md
diff --git a/.changeset/dull-toes-drop.md b/.changeset/dull-toes-drop.md
diff --git a/.changeset/empty-news-add.md b/.changeset/empty-news-add.md
diff --git a/.changeset/fluffy-kings-sniff.md b/.changeset/fluffy-kings-sniff.md
diff --git a/.changeset/four-pumas-tell.md b/.changeset/four-pumas-tell.md
diff --git a/.changeset/giant-clubs-jump.md b/.changeset/giant-clubs-jump.md
diff --git a/.changeset/happy-zoos-greet.md b/.changeset/happy-zoos-greet.md
diff --git a/.changeset/long-wasps-film.md b/.changeset/long-wasps-film.md
diff --git a/.changeset/major-candles-mate.md b/.changeset/major-candles-mate.md
diff --git a/.changeset/nervous-frogs-visit.md b/.changeset/nervous-frogs-visit.md
diff --git a/.changeset/odd-geckos-breathe.md b/.changeset/odd-geckos-breathe.md
diff --git a/.changeset/odd-windows-brake.md b/.changeset/odd-windows-brake.md
diff --git a/.changeset/tired-cars-enjoy.md b/.changeset/tired-cars-enjoy.md
diff --git a/.changeset/twenty-owls-tan.md b/.changeset/twenty-owls-tan.md
diff --git a/elixir-sdk/CHANGELOG.md b/elixir-sdk/CHANGELOG.md
@@ -1,5 +1,29 @@
 # elixir-sdk
 
+## 0.2.4
+
+### Patch Changes
+
+- [#330](https://github.com/Eppo-exp/eppo-multiplatform/pull/330) [`173b0f5`](https://github.com/Eppo-exp/eppo-multiplatform/commit/173b0f58bc6e3a449d8d0d54381f19c688c0fe3f) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump log from 0.4.25 to 0.4.28
+
+- [#388](https://github.com/Eppo-exp/eppo-multiplatform/pull/388) [`9120912`](https://github.com/Eppo-exp/eppo-multiplatform/commit/9120912cae13e4e7e980c55c544a1e6d1626aeea) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Fix SDK incorrectly returning default values instead of false variants.
+
+- [#394](https://github.com/Eppo-exp/eppo-multiplatform/pull/394) [`aa6130d`](https://github.com/Eppo-exp/eppo-multiplatform/commit/aa6130d19693b6318c826e450ec09bc455460b86) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Added experimental support for CityHash-based hashing in bandit evaluation via the `EPPO_EXPERIMENTAL_BANDITS_CITYHASH` environment variable (set to `"1"`, `"true"`, or `"TRUE"` to enable). This provides significant performance improvements over the default MD5 implementation, especially when evaluating bandits with many actions.
+
+  **Warning**: This feature is experimental and unstable. Enabling CityHash will produce different bandit evaluation results compared to the default MD5 implementation and other Eppo SDKs. Do not enable this if you need consistent results across multiple SDKs, services, or for historical data comparisons.
+
+- [#397](https://github.com/Eppo-exp/eppo-multiplatform/pull/397) [`db85656`](https://github.com/Eppo-exp/eppo-multiplatform/commit/db856561ab07e84ff50748986cf2224fb7a97718) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump tokio from 1.48.0 to 1.49.0
+
+- [#389](https://github.com/Eppo-exp/eppo-multiplatform/pull/389) [`066661a`](https://github.com/Eppo-exp/eppo-multiplatform/commit/066661a54161cd511a144be86eea254faa7dd61b) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump ring from 0.17.9 to 0.17.14
+
+- [#332](https://github.com/Eppo-exp/eppo-multiplatform/pull/332) [`176028b`](https://github.com/Eppo-exp/eppo-multiplatform/commit/176028bd4d046a064076787ccd6cd7760b5388bd) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump serde_json from 1.0.138 to 1.0.145
+
+- [#391](https://github.com/Eppo-exp/eppo-multiplatform/pull/391) [`415a90f`](https://github.com/Eppo-exp/eppo-multiplatform/commit/415a90f188cae978e98a8f944502ef7662bd7861) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Use faster md5 implementation.
+
+- [#350](https://github.com/Eppo-exp/eppo-multiplatform/pull/350) [`91b44b7`](https://github.com/Eppo-exp/eppo-multiplatform/commit/91b44b79d8d301261838a83710e21ae18c00b64a) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump tokio from 1.44.1 to 1.48.0
+
+- [#392](https://github.com/Eppo-exp/eppo-multiplatform/pull/392) [`8995232`](https://github.com/Eppo-exp/eppo-multiplatform/commit/89952327ca6d5c863e7f06ce4f9903ce72e3223f) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Improve bandit evaluation performance.
+
 ## 0.2.3
 
 ### Patch Changes

diff --git a/elixir-sdk/Cargo.lock b/elixir-sdk/Cargo.lock
diff --git a/elixir-sdk/mix.exs b/elixir-sdk/mix.exs
@@ -4,7 +4,7 @@ defmodule EppoSdk.MixProject do
   def project do
     [
       app: :eppo_sdk,
-      version: "0.2.3",
+      version: "0.2.4",
       elixir: "~> 1.15",
       start_permanent: Mix.env() == :prod,
       description: "Elixir SDK for Eppo's feature flagging and experimentation platform",

diff --git a/elixir-sdk/native/sdk_core/Cargo.toml b/elixir-sdk/native/sdk_core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sdk_core"
-version = "0.2.3"
+version = "0.2.4"
 authors = []
 edition = "2021"
 
@@ -10,7 +10,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 rustler = { version = "0.36.1", features = ["serde"] }
-eppo_core = { version = "=9.3.0", features = ["rustler"] }
+eppo_core = { version = "=10.0.0", features = ["rustler"] }
 serde_json = "1.0.148"
 tokio = { version = "1.49.0", default-features = false, features = ["time"] }
 log = "0.4.29"
diff --git a/elixir-sdk/package.json b/elixir-sdk/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "elixir-sdk",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "dependencies": {},
   "devDependencies": {},
   "scripts": {

diff --git a/eppo_core/CHANGELOG.md b/eppo_core/CHANGELOG.md
@@ -1,5 +1,27 @@
 # eppo_core
 
+## 10.0.0
+
+### Major Changes
+
+- [#382](https://github.com/Eppo-exp/eppo-multiplatform/pull/382) [`78515fb`](https://github.com/Eppo-exp/eppo-multiplatform/commit/78515fb0e706ed574acdabae75678e4e2bf10062) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - [pyo3] Update to pyo3 0.27, remove `TryToPyObject` trait because pyo3's `IntoPyObject` now properly handles errors.
+
+### Minor Changes
+
+- [#393](https://github.com/Eppo-exp/eppo-multiplatform/pull/393) [`21b48a2`](https://github.com/Eppo-exp/eppo-multiplatform/commit/21b48a2fdebb29c402670282935d8f958edc75c1) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - [ahash] Add "ahash" feature flag to use faster hash function for all hashmaps. It is changing the public interface so is disabled by default so as to not cause breakage across SDKs and allow them to update one by one.
+
+- [#380](https://github.com/Eppo-exp/eppo-multiplatform/pull/380) [`6c66f91`](https://github.com/Eppo-exp/eppo-multiplatform/commit/6c66f91ba2b85c46591a3f361c037ce5c2d5e7a7) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - [ruby] support ruby-4.0
+
+### Patch Changes
+
+- [#394](https://github.com/Eppo-exp/eppo-multiplatform/pull/394) [`aa6130d`](https://github.com/Eppo-exp/eppo-multiplatform/commit/aa6130d19693b6318c826e450ec09bc455460b86) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Added experimental support for CityHash-based hashing in bandit evaluation via the `EPPO_EXPERIMENTAL_BANDITS_CITYHASH` environment variable (set to `"1"`, `"true"`, or `"TRUE"` to enable). This provides significant performance improvements over the default MD5 implementation, especially when evaluating bandits with many actions.
+
+  **Warning**: This feature is experimental and unstable. Enabling CityHash will produce different bandit evaluation results compared to the default MD5 implementation and other Eppo SDKs. Do not enable this if you need consistent results across multiple SDKs, services, or for historical data comparisons.
+
+- [#391](https://github.com/Eppo-exp/eppo-multiplatform/pull/391) [`415a90f`](https://github.com/Eppo-exp/eppo-multiplatform/commit/415a90f188cae978e98a8f944502ef7662bd7861) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Use faster md5 implementation.
+
+- [#392](https://github.com/Eppo-exp/eppo-multiplatform/pull/392) [`8995232`](https://github.com/Eppo-exp/eppo-multiplatform/commit/89952327ca6d5c863e7f06ce4f9903ce72e3223f) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Improve bandit evaluation performance.
+
 ## 9.3.0
 
 ### Minor Changes

diff --git a/eppo_core/Cargo.toml b/eppo_core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "eppo_core"
-version = "9.3.0"
+version = "10.0.0"
 edition = "2021"
 description = "Eppo SDK core library"
 repository = "https://github.com/Eppo-exp/rust-sdk"

diff --git a/eppo_core/package.json b/eppo_core/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "eppo_core",
-  "version": "9.3.0",
+  "version": "10.0.0",
   "dependencies": {},
   "devDependencies": {},
   "scripts": {

diff --git a/python-sdk/CHANGELOG.md b/python-sdk/CHANGELOG.md
@@ -1,5 +1,21 @@
 # python-sdk
 
+## 4.4.1
+
+### Patch Changes
+
+- [#382](https://github.com/Eppo-exp/eppo-multiplatform/pull/382) [`78515fb`](https://github.com/Eppo-exp/eppo-multiplatform/commit/78515fb0e706ed574acdabae75678e4e2bf10062) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Update pyo3 to 0.27.2. Support python 3.14.
+
+- [#394](https://github.com/Eppo-exp/eppo-multiplatform/pull/394) [`aa6130d`](https://github.com/Eppo-exp/eppo-multiplatform/commit/aa6130d19693b6318c826e450ec09bc455460b86) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Added experimental support for CityHash-based hashing in bandit evaluation via the `EPPO_EXPERIMENTAL_BANDITS_CITYHASH` environment variable (set to `"1"`, `"true"`, or `"TRUE"` to enable). This provides significant performance improvements over the default MD5 implementation, especially when evaluating bandits with many actions.
+
+  **Warning**: This feature is experimental and unstable. Enabling CityHash will produce different bandit evaluation results compared to the default MD5 implementation and other Eppo SDKs. Do not enable this if you need consistent results across multiple SDKs, services, or for historical data comparisons.
+
+- [#391](https://github.com/Eppo-exp/eppo-multiplatform/pull/391) [`415a90f`](https://github.com/Eppo-exp/eppo-multiplatform/commit/415a90f188cae978e98a8f944502ef7662bd7861) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Use faster md5 implementation.
+
+- [#392](https://github.com/Eppo-exp/eppo-multiplatform/pull/392) [`8995232`](https://github.com/Eppo-exp/eppo-multiplatform/commit/89952327ca6d5c863e7f06ce4f9903ce72e3223f) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Improve bandit evaluation performance.
+
+- [#393](https://github.com/Eppo-exp/eppo-multiplatform/pull/393) [`21b48a2`](https://github.com/Eppo-exp/eppo-multiplatform/commit/21b48a2fdebb29c402670282935d8f958edc75c1) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - perf: use faster hash function for internal hashmaps (ahash).
+
 ## 4.4.0
 
 ### Minor Changes

diff --git a/python-sdk/Cargo.toml b/python-sdk/Cargo.toml
@@ -1,14 +1,14 @@
 [package]
 name = "eppo_py"
-version = "4.4.0"
+version = "4.4.1"
 edition = "2021"
 publish = false
 
 [lib]
 crate-type = ["cdylib"]
 
 [dependencies]
-eppo_core = { version = "=9.3.0", path = "../eppo_core", features = ["pyo3", "ahash"] }
+eppo_core = { version = "=10.0.0", path = "../eppo_core", features = ["pyo3", "ahash"] }
 log = "0.4.22"
 pyo3 = "0.27.2"
 pyo3-log = "0.13.2"

diff --git a/python-sdk/package.json b/python-sdk/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "python-sdk",
-  "version": "4.4.0",
+  "version": "4.4.1",
   "dependencies": {},
   "devDependencies": {},
   "scripts": {

diff --git a/ruby-sdk/CHANGELOG.md b/ruby-sdk/CHANGELOG.md
@@ -1,5 +1,29 @@
 # ruby-sdk
 
+## 3.8.0
+
+### Minor Changes
+
+- [#380](https://github.com/Eppo-exp/eppo-multiplatform/pull/380) [`6c66f91`](https://github.com/Eppo-exp/eppo-multiplatform/commit/6c66f91ba2b85c46591a3f361c037ce5c2d5e7a7) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - [ruby] support ruby-4.0
+
+### Patch Changes
+
+- [#386](https://github.com/Eppo-exp/eppo-multiplatform/pull/386) [`83c8fd3`](https://github.com/Eppo-exp/eppo-multiplatform/commit/83c8fd3acafc9b99e76bef9c5eaecb2de10edf0e) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump ring from 0.17.8 to 0.17.14
+
+- [#394](https://github.com/Eppo-exp/eppo-multiplatform/pull/394) [`aa6130d`](https://github.com/Eppo-exp/eppo-multiplatform/commit/aa6130d19693b6318c826e450ec09bc455460b86) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Added experimental support for CityHash-based hashing in bandit evaluation via the `EPPO_EXPERIMENTAL_BANDITS_CITYHASH` environment variable (set to `"1"`, `"true"`, or `"TRUE"` to enable). This provides significant performance improvements over the default MD5 implementation, especially when evaluating bandits with many actions.
+
+  **Warning**: This feature is experimental and unstable. Enabling CityHash will produce different bandit evaluation results compared to the default MD5 implementation and other Eppo SDKs. Do not enable this if you need consistent results across multiple SDKs, services, or for historical data comparisons.
+
+- [#331](https://github.com/Eppo-exp/eppo-multiplatform/pull/331) [`7a87ece`](https://github.com/Eppo-exp/eppo-multiplatform/commit/7a87ececb0870ae7302623caec7526d76b0c5193) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump log from 0.4.22 to 0.4.28
+
+- [#402](https://github.com/Eppo-exp/eppo-multiplatform/pull/402) [`94a6aae`](https://github.com/Eppo-exp/eppo-multiplatform/commit/94a6aae1c62c9c3ef42adb875c162f6da64fafef) Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps): bump tokio from 1.48.0 to 1.49.0
+
+- [#391](https://github.com/Eppo-exp/eppo-multiplatform/pull/391) [`415a90f`](https://github.com/Eppo-exp/eppo-multiplatform/commit/415a90f188cae978e98a8f944502ef7662bd7861) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Use faster md5 implementation.
+
+- [#392](https://github.com/Eppo-exp/eppo-multiplatform/pull/392) [`8995232`](https://github.com/Eppo-exp/eppo-multiplatform/commit/89952327ca6d5c863e7f06ce4f9903ce72e3223f) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Improve bandit evaluation performance.
+
+- [#393](https://github.com/Eppo-exp/eppo-multiplatform/pull/393) [`21b48a2`](https://github.com/Eppo-exp/eppo-multiplatform/commit/21b48a2fdebb29c402670282935d8f958edc75c1) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - perf: use faster hash function for internal hashmaps (ahash).
+
 ## 3.7.4
 
 ### Patch Changes

diff --git a/ruby-sdk/ext/eppo_client/Cargo.toml b/ruby-sdk/ext/eppo_client/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "eppo_client"
 # TODO: this version and lib/eppo_client/version.rb should be in sync
-version = "3.7.4"
+version = "3.8.0"
 edition = "2021"
 license = "MIT"
 publish = false
@@ -12,7 +12,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 env_logger = { version = "0.11.3", features = ["unstable-kv"] }
-eppo_core = { version = "=9.3.0", features = ["magnus", "event_ingestion", "ahash"] }
+eppo_core = { version = "=10.0.0", features = ["magnus", "event_ingestion", "ahash"] }
 log = { version = "0.4.29", features = ["kv_serde"] }
 magnus = { version = "0.8.2" }
 serde = { version = "1.0.203", features = ["derive"] }

diff --git a/ruby-sdk/lib/eppo_client/version.rb b/ruby-sdk/lib/eppo_client/version.rb
@@ -2,5 +2,5 @@
 
 # TODO: this version and ext/eppo_client/Cargo.toml should be in sync
 module EppoClient
-  VERSION = "3.7.4"
+  VERSION = "3.8.0"
 end
diff --git a/ruby-sdk/package.json b/ruby-sdk/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "ruby-sdk",
-  "version": "3.7.4",
+  "version": "3.8.0",
   "dependencies": {},
   "devDependencies": {},
   "scripts": {

diff --git a/rust-sdk/CHANGELOG.md b/rust-sdk/CHANGELOG.md
@@ -1,5 +1,17 @@
 # rust-sdk
 
+## 5.2.1
+
+### Patch Changes
+
+- [#394](https://github.com/Eppo-exp/eppo-multiplatform/pull/394) [`aa6130d`](https://github.com/Eppo-exp/eppo-multiplatform/commit/aa6130d19693b6318c826e450ec09bc455460b86) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Added experimental support for CityHash-based hashing in bandit evaluation via the `EPPO_EXPERIMENTAL_BANDITS_CITYHASH` environment variable (set to `"1"`, `"true"`, or `"TRUE"` to enable). This provides significant performance improvements over the default MD5 implementation, especially when evaluating bandits with many actions.
+
+  **Warning**: This feature is experimental and unstable. Enabling CityHash will produce different bandit evaluation results compared to the default MD5 implementation and other Eppo SDKs. Do not enable this if you need consistent results across multiple SDKs, services, or for historical data comparisons.
+
+- [#391](https://github.com/Eppo-exp/eppo-multiplatform/pull/391) [`415a90f`](https://github.com/Eppo-exp/eppo-multiplatform/commit/415a90f188cae978e98a8f944502ef7662bd7861) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Use faster md5 implementation.
+
+- [#392](https://github.com/Eppo-exp/eppo-multiplatform/pull/392) [`8995232`](https://github.com/Eppo-exp/eppo-multiplatform/commit/89952327ca6d5c863e7f06ce4f9903ce72e3223f) Thanks [@dd-oleksii](https://github.com/dd-oleksii)! - Improve bandit evaluation performance.
+
 ## 5.2.0
 
 ### Minor Changes

diff --git a/rust-sdk/Cargo.toml b/rust-sdk/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "eppo"
-version = "5.2.0"
+version = "5.2.1"
 edition = "2021"
 description = "Eppo SDK for Rust"
 homepage = "https://docs.geteppo.com/sdks/server-sdks/rust"
@@ -11,7 +11,7 @@ categories = ["config"]
 rust-version = "1.80.0"
 
 [dependencies]
-eppo_core = { version = "=9.3.0", path = "../eppo_core" }
+eppo_core = { version = "=10.0.0", path = "../eppo_core" }
 log = { version = "0.4.21", features = ["kv", "kv_serde"] }
 serde_json = "1.0.116"
 tokio = { version = "1.34.0", default-features = false, features = ["time"] }

diff --git a/rust-sdk/package.json b/rust-sdk/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "rust-sdk",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "dependencies": {},
   "devDependencies": {},
   "scripts": {