diff --git a/requirements.dev.txt b/requirements.dev.txt
index f407b15..185e3ff 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -14,7 +14,7 @@ mccabe==0.6.1
 mypy==0.720
 mypy-extensions==0.4.1
 pkginfo==1.5.0.1
-protobuf==3.9.1
+protobuf==3.15.0
 Pygments==2.4.2
 pylint==2.3.1
 python-dateutil==2.8.0
diff --git a/requirements.txt b/requirements.txt
index acd8b11..c4dca05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ botocore==1.12.224
 docutils==0.15.2
 grpcio==1.23.0
 jmespath==0.9.4
-protobuf==3.9.1
+protobuf==3.15.0
 python-dateutil==2.8.0
 s3transfer==0.2.1
 simiotics==0.1.2