diff --git a/.changelog/5442.fixed b/.changelog/5442.fixed
new file mode 100644
index 00000000000..f91dea250ae
--- /dev/null
+++ b/.changelog/5442.fixed
@@ -0,0 +1 @@
+`opentelemetry-exporter-otlp-proto-http`: remove duplicate session header update in the span, metric and log exporters
diff --git a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py
index a133874fcfa..ccf533e5b53 100644
--- a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py
+++ b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py
@@ -133,7 +133,6 @@ def __init__(
             )
             or requests.Session()
         )
-        self._session.headers.update(self._headers)
         self._session.headers.update(_OTLP_HTTP_HEADERS)
         # let users override our defaults
         self._session.headers.update(self._headers)
diff --git a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py
index 6cf13deae17..b5abdc581a9 100644
--- a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py
+++ b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py
@@ -191,7 +191,6 @@ def __init__(
             )
             or requests.Session()
         )
-        self._session.headers.update(self._headers)
         self._session.headers.update(_OTLP_HTTP_HEADERS)
         # let users override our defaults
         self._session.headers.update(self._headers)
diff --git a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py
index 2be240103c0..6a46348dee6 100644
--- a/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py
+++ b/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py
@@ -128,7 +128,6 @@ def __init__(
             )
             or requests.Session()
         )
-        self._session.headers.update(self._headers)
         self._session.headers.update(_OTLP_HTTP_HEADERS)
         # let users override our defaults
         self._session.headers.update(self._headers)