diff --git a/requirements/dev-3.6.txt b/requirements/dev-3.6.txt
index a3afc26..e67666e 100644
--- a/requirements/dev-3.6.txt
+++ b/requirements/dev-3.6.txt
@@ -42,7 +42,7 @@ pexpect==4.7.0            # via ipython
 pickleshare==0.7.5        # via ipython
 pluggy==0.12.0            # via pytest
 prompt-toolkit==2.0.9     # via ipython
-protobuf==3.9.0           # via google-api-core, googleapis-common-protos
+protobuf==3.18.3           # via google-api-core, googleapis-common-protos
 ptyprocess==0.6.0         # via pexpect
 py==1.8.0                 # via pytest
 pyasn1-modules==0.2.5     # via google-auth
diff --git a/requirements/dev-3.7-dev.txt b/requirements/dev-3.7-dev.txt
index a3afc26..e67666e 100644
--- a/requirements/dev-3.7-dev.txt
+++ b/requirements/dev-3.7-dev.txt
@@ -42,7 +42,7 @@ pexpect==4.7.0            # via ipython
 pickleshare==0.7.5        # via ipython
 pluggy==0.12.0            # via pytest
 prompt-toolkit==2.0.9     # via ipython
-protobuf==3.9.0           # via google-api-core, googleapis-common-protos
+protobuf==3.18.3           # via google-api-core, googleapis-common-protos
 ptyprocess==0.6.0         # via pexpect
 py==1.8.0                 # via pytest
 pyasn1-modules==0.2.5     # via google-auth
diff --git a/requirements/dev-3.7.txt b/requirements/dev-3.7.txt
index a3afc26..e67666e 100644
--- a/requirements/dev-3.7.txt
+++ b/requirements/dev-3.7.txt
@@ -42,7 +42,7 @@ pexpect==4.7.0            # via ipython
 pickleshare==0.7.5        # via ipython
 pluggy==0.12.0            # via pytest
 prompt-toolkit==2.0.9     # via ipython
-protobuf==3.9.0           # via google-api-core, googleapis-common-protos
+protobuf==3.18.3           # via google-api-core, googleapis-common-protos
 ptyprocess==0.6.0         # via pexpect
 py==1.8.0                 # via pytest
 pyasn1-modules==0.2.5     # via google-auth