diff --git a/ci/flaky_test/requirements.txt b/ci/flaky_test/requirements.txt
index 95bac14fdd655..9fe42375ba22f 100644
--- a/ci/flaky_test/requirements.txt
+++ b/ci/flaky_test/requirements.txt
@@ -39,9 +39,9 @@ aiohttp==3.7.4.post0 \
 async-timeout==3.0.1 \
     --hash=sha256:0c3c816a028d47f659d6ff5c745cb2acf1f966da1fe5c19c77a70282b25f4c5f \
     --hash=sha256:4291ca197d287d274d0b6cb5d6f8f8f82d434ed288f962539ff18cc9012f9ea3
-attrs==20.3.0 \
-    --hash=sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6 \
-    --hash=sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700
+attrs==21.2.0 \
+    --hash=sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1 \
+    --hash=sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb
 chardet==4.0.0 \
     --hash=sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5 \
     --hash=sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa
diff --git a/examples/grpc-bridge/client/requirements.txt b/examples/grpc-bridge/client/requirements.txt
index 436a97af70862..327544f83036d 100644
--- a/examples/grpc-bridge/client/requirements.txt
+++ b/examples/grpc-bridge/client/requirements.txt
@@ -1,4 +1,4 @@
 requests>=2.22.0
 grpcio
 grpcio-tools
-protobuf==3.15.8
+protobuf==3.16.0
diff --git a/tools/code_format/requirements.txt b/tools/code_format/requirements.txt
index 5fce0f0c10e10..15ba3b2f5e01d 100644
--- a/tools/code_format/requirements.txt
+++ b/tools/code_format/requirements.txt
@@ -1,6 +1,6 @@
-flake8==3.9.1 \
-    --hash=sha256:3b9f848952dddccf635be78098ca75010f073bfe14d2c6bda867154bea728d2a \
-    --hash=sha256:1aa8990be1e689d96c745c5682b687ea49f2e05a443aff1f8251092b0014e378
+flake8==3.9.2 \
+    --hash=sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907 \
+    --hash=sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b
 importlib-metadata==4.0.1 \
     --hash=sha256:d7eb1dea6d6a6086f8be21784cc9e3bcfa55872b52309bc5fad53a8ea444465d \
     --hash=sha256:8c501196e49fb9df5df43833bdb1e4328f64847763ec8a50703148b73784d581
diff --git a/tools/testing/requirements.txt b/tools/testing/requirements.txt
index 075ebbd7a2247..2d5b619ca3e43 100644
--- a/tools/testing/requirements.txt
+++ b/tools/testing/requirements.txt
@@ -4,9 +4,9 @@
 #
 #    pip-compile --generate-hashes tools/testing/requirements.txt
 #
-attrs==20.3.0 \
-    --hash=sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6 \
-    --hash=sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700
+attrs==21.2.0 \
+    --hash=sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1 \
+    --hash=sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb
     # via
     #   -r tools/testing/requirements.txt
     #   pytest