chore(main): release 2.6.0 (#232)

diff --git a/v2/.release-please-manifest.json b/v2/.release-please-manifest.json
index 129685e..7ea75bf 100644
--- a/v2/.release-please-manifest.json
+++ b/v2/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-    "v2": "2.5.1"
+    "v2": "2.6.0"
 }
diff --git a/v2/CHANGES.md b/v2/CHANGES.md
index 2a05e44..fb8463a 100644
--- a/v2/CHANGES.md
+++ b/v2/CHANGES.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.6.0](https://github.com/googleapis/gax-go/compare/v2.5.1...v2.6.0) (2022-10-13)
+
+
+### Features
+
+* **v2:** copy DetermineContentType functionality ([#230](https://github.com/googleapis/gax-go/issues/230)) ([2c52a70](https://github.com/googleapis/gax-go/commit/2c52a70bae965397f740ed27d46aabe89ff249b3))
+
 ## [2.5.1](https://github.com/googleapis/gax-go/compare/v2.5.0...v2.5.1) (2022-08-04)
 
 
diff --git a/v2/internal/version.go b/v2/internal/version.go
index a46ae25..065312e 100644
--- a/v2/internal/version.go
+++ b/v2/internal/version.go
@@ -30,4 +30,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "2.5.1"
+const Version = "2.6.0"