diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 85e5958..82cfd7e 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -5,6 +5,9 @@ on:
     branches:
       - "main"
       - "dev"
+  push:
+    branches:
+      - "dev"
   workflow_dispatch:
 
 permissions:
diff --git a/pyproject.toml b/pyproject.toml
index 8e9c09f..7513160 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "danom"
-version = "0.15.0"
+version = "0.15.1"
 description = "Functional streams and monads"
 readme = "README.md"
 license = "MIT"
diff --git a/src/danom/_stream.py b/src/danom/_stream.py
index 9652a69..a3b313f 100644
--- a/src/danom/_stream.py
+++ b/src/danom/_stream.py
@@ -533,7 +533,7 @@ class _Tap:
     fn: Callable
 
     def __call__(self, value: T) -> T:
-        deepcopy(self.fn(value))
+        self.fn(deepcopy(value))
         return value
 
 
diff --git a/uv.lock b/uv.lock
index 4d08814..d901ec0 100644
--- a/uv.lock
+++ b/uv.lock
@@ -343,7 +343,7 @@ wheels = [
 
 [[package]]
 name = "danom"
-version = "0.15.0"
+version = "0.15.1"
 source = { editable = "." }
 dependencies = [
     { name = "attrs" },