diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,20 @@
+# Version [0.15.0.0](https://github.com/blockfrost/blockfrost-haskell/compare/api-0.14.0.0...api-0.15.0.0) (2026-02-02)
+
+* Changes
+  * Fix `MempoolUTxOInput` `address` field from `Text` to `Maybe Text` [#83](https://github.com/blockfrost/blockfrost-haskell/issues/83) [#84](https://github.com/blockfrost/blockfrost-haskell/pull/84)
+  * Mempool API functions adjusted to not require passing in `Project` [#85](https://github.com/blockfrost/blockfrost-haskell/pull/85)
+    * Previous `getMempoolTransactions prj def def` is now simply `getMempoolTransactions` and a principled
+      variant `getMempoolTransactions'` is provided accepting page and sort order parameters
+      (for example `allPages $ \p -> getMempoolTransactions' p def`).
+    * Similar for `getMempoolTransactionsByAddress`.
+    * `getMempoolTransaction` now simply doesn't require passing `Project`
+
 # Version [0.14.0.0](https://github.com/blockfrost/blockfrost-haskell/compare/api-0.13.0.0...api-0.14.0.0) (2025-12-02)
 
 * Changes
   * Add `CustomURL` to `Env`, to allow arbitrary Blockfrost instance [#79](https://github.com/blockfrost/blockfrost-haskell/pull/79)
   * `BlockfrostNotFound` constructor of `BlockfrostError` is now `BlockfrostNotFound Text`
-    containing path that resulted in 404 error [#80](https://github.com/blockfrost/blockfrost-haskell/pull/80)
+    containing path that resulted in 404 error [#81](https://github.com/blockfrost/blockfrost-haskell/pull/81)
   * Drop `Sanchonet` `Env` [#79](https://github.com/blockfrost/blockfrost-haskell/pull/79)
 
 # Version [0.13.0.0](https://github.com/blockfrost/blockfrost-haskell/compare/api-0.12.2.0...api-0.13.0.0) (2025-06-03)
diff --git a/blockfrost-api.cabal b/blockfrost-api.cabal
--- a/blockfrost-api.cabal
+++ b/blockfrost-api.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                blockfrost-api
-version:             0.14.0.0
+version:             0.15.0.0
 synopsis:            API definitions for blockfrost.io
 description:         Core types and Servant API description
 homepage:            https://github.com/blockfrost/blockfrost-haskell
diff --git a/src/Blockfrost/Types/Cardano/Mempool.hs b/src/Blockfrost/Types/Cardano/Mempool.hs
--- a/src/Blockfrost/Types/Cardano/Mempool.hs
+++ b/src/Blockfrost/Types/Cardano/Mempool.hs
@@ -47,7 +47,7 @@
   via CustomJSON '[FieldLabelModifier '[StripPrefix "_transaction", CamelToSnake]] TransactionInMempool
 
 data MempoolUTxOInput = MempoolUTxOInput
-   { _address :: Text -- ^ Address
+   { _address :: Maybe Text -- ^ Address
    , _txHash :: Text -- ^ Transaction hash
    , _outputIndex :: Integer -- ^ Output index
    , _collateral :: Bool -- ^ True if the input is a collateral input