diff --git a/opentelemetry-proto/test-requirements.in b/opentelemetry-proto/test-requirements.in
index 897bf3682d..9246922a41 100644
--- a/opentelemetry-proto/test-requirements.in
+++ b/opentelemetry-proto/test-requirements.in
@@ -1,6 +1,6 @@
 colorama>=0.4.6
 iniconfig>=2.0.0
 packaging>=24.0
-protobuf>=5.29.5
+protobuf>=5.29.6
 pytest>=7.4.4
 -e opentelemetry-proto
diff --git a/opentelemetry-proto/test-requirements.latest.txt b/opentelemetry-proto/test-requirements.latest.txt
index f62c1b2585..263bd6d2e2 100644
--- a/opentelemetry-proto/test-requirements.latest.txt
+++ b/opentelemetry-proto/test-requirements.latest.txt
@@ -18,7 +18,7 @@ packaging==26.0
     #   pytest
 pluggy==1.6.0
     # via pytest
-protobuf==6.33.6
+protobuf==5.29.6
     # via
     #   -r opentelemetry-proto/test-requirements.in
     #   opentelemetry-proto
diff --git a/opentelemetry-proto/test-requirements.oldest.txt b/opentelemetry-proto/test-requirements.oldest.txt
index 56697dcf7d..c925a09b62 100644
--- a/opentelemetry-proto/test-requirements.oldest.txt
+++ b/opentelemetry-proto/test-requirements.oldest.txt
@@ -18,7 +18,7 @@ packaging==24.0
     #   pytest
 pluggy==1.6.0
     # via pytest
-protobuf==5.29.5
+protobuf==5.29.6
     # via
     #   -r opentelemetry-proto/test-requirements.in
     #   opentelemetry-proto