diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index aa54796..3815c98 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,4 +13,4 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:e09366bdf0fd9c8976592988390b24d53583dd9f002d476934da43725adbb978
+  digest: sha256:7a40313731a7cb1454eef6b33d3446ebb121836738dc3ab3d2d3ded5268c35b6
diff --git a/.kokoro/requirements.txt b/.kokoro/requirements.txt
index 385f2d4..d15994b 100644
--- a/.kokoro/requirements.txt
+++ b/.kokoro/requirements.txt
@@ -325,31 +325,30 @@ platformdirs==2.5.2 \
     --hash=sha256:027d8e83a2d7de06bbac4e5ef7e023c02b863d7ea5d079477e722bb41ab25788 \
     --hash=sha256:58c8abb07dcb441e6ee4b11d8df0ac856038f944ab98b7be6b27b2a3c7feef19
     # via virtualenv
-protobuf==3.20.1 \
-    --hash=sha256:06059eb6953ff01e56a25cd02cca1a9649a75a7e65397b5b9b4e929ed71d10cf \
-    --hash=sha256:097c5d8a9808302fb0da7e20edf0b8d4703274d140fd25c5edabddcde43e081f \
-    --hash=sha256:284f86a6207c897542d7e956eb243a36bb8f9564c1742b253462386e96c6b78f \
-    --hash=sha256:32ca378605b41fd180dfe4e14d3226386d8d1b002ab31c969c366549e66a2bb7 \
-    --hash=sha256:3cc797c9d15d7689ed507b165cd05913acb992d78b379f6014e013f9ecb20996 \
-    --hash=sha256:62f1b5c4cd6c5402b4e2d63804ba49a327e0c386c99b1675c8a0fefda23b2067 \
-    --hash=sha256:69ccfdf3657ba59569c64295b7d51325f91af586f8d5793b734260dfe2e94e2c \
-    --hash=sha256:6f50601512a3d23625d8a85b1638d914a0970f17920ff39cec63aaef80a93fb7 \
-    --hash=sha256:7403941f6d0992d40161aa8bb23e12575637008a5a02283a930addc0508982f9 \
-    --hash=sha256:755f3aee41354ae395e104d62119cb223339a8f3276a0cd009ffabfcdd46bb0c \
-    --hash=sha256:77053d28427a29987ca9caf7b72ccafee011257561259faba8dd308fda9a8739 \
-    --hash=sha256:7e371f10abe57cee5021797126c93479f59fccc9693dafd6bd5633ab67808a91 \
-    --hash=sha256:9016d01c91e8e625141d24ec1b20fed584703e527d28512aa8c8707f105a683c \
-    --hash=sha256:9be73ad47579abc26c12024239d3540e6b765182a91dbc88e23658ab71767153 \
-    --hash=sha256:adc31566d027f45efe3f44eeb5b1f329da43891634d61c75a5944e9be6dd42c9 \
-    --hash=sha256:adfc6cf69c7f8c50fd24c793964eef18f0ac321315439d94945820612849c388 \
-    --hash=sha256:af0ebadc74e281a517141daad9d0f2c5d93ab78e9d455113719a45a49da9db4e \
-    --hash=sha256:cb29edb9eab15742d791e1025dd7b6a8f6fcb53802ad2f6e3adcb102051063ab \
-    --hash=sha256:cd68be2559e2a3b84f517fb029ee611546f7812b1fdd0aa2ecc9bc6ec0e4fdde \
-    --hash=sha256:cdee09140e1cd184ba9324ec1df410e7147242b94b5f8b0c64fc89e38a8ba531 \
-    --hash=sha256:db977c4ca738dd9ce508557d4fce0f5aebd105e158c725beec86feb1f6bc20d8 \
-    --hash=sha256:dd5789b2948ca702c17027c84c2accb552fc30f4622a98ab5c51fcfe8c50d3e7 \
-    --hash=sha256:e250a42f15bf9d5b09fe1b293bdba2801cd520a9f5ea2d7fb7536d4441811d20 \
-    --hash=sha256:ff8d8fa42675249bb456f5db06c00de6c2f4c27a065955917b28c4f15978b9c3
+protobuf==3.20.2 \
+    --hash=sha256:03d76b7bd42ac4a6e109742a4edf81ffe26ffd87c5993126d894fe48a120396a \
+    --hash=sha256:09e25909c4297d71d97612f04f41cea8fa8510096864f2835ad2f3b3df5a5559 \
+    --hash=sha256:18e34a10ae10d458b027d7638a599c964b030c1739ebd035a1dfc0e22baa3bfe \
+    --hash=sha256:291fb4307094bf5ccc29f424b42268640e00d5240bf0d9b86bf3079f7576474d \
+    --hash=sha256:2c0b040d0b5d5d207936ca2d02f00f765906622c07d3fa19c23a16a8ca71873f \
+    --hash=sha256:384164994727f274cc34b8abd41a9e7e0562801361ee77437099ff6dfedd024b \
+    --hash=sha256:3cb608e5a0eb61b8e00fe641d9f0282cd0eedb603be372f91f163cbfbca0ded0 \
+    --hash=sha256:5d9402bf27d11e37801d1743eada54372f986a372ec9679673bfcc5c60441151 \
+    --hash=sha256:712dca319eee507a1e7df3591e639a2b112a2f4a62d40fe7832a16fd19151750 \
+    --hash=sha256:7a5037af4e76c975b88c3becdf53922b5ffa3f2cddf657574a4920a3b33b80f3 \
+    --hash=sha256:8228e56a865c27163d5d1d1771d94b98194aa6917bcfb6ce139cbfa8e3c27334 \
+    --hash=sha256:84a1544252a933ef07bb0b5ef13afe7c36232a774affa673fc3636f7cee1db6c \
+    --hash=sha256:84fe5953b18a383fd4495d375fe16e1e55e0a3afe7b4f7b4d01a3a0649fcda9d \
+    --hash=sha256:9c673c8bfdf52f903081816b9e0e612186684f4eb4c17eeb729133022d6032e3 \
+    --hash=sha256:9f876a69ca55aed879b43c295a328970306e8e80a263ec91cf6e9189243c613b \
+    --hash=sha256:a9e5ae5a8e8985c67e8944c23035a0dff2c26b0f5070b2f55b217a1c33bbe8b1 \
+    --hash=sha256:b4fdb29c5a7406e3f7ef176b2a7079baa68b5b854f364c21abe327bbeec01cdb \
+    --hash=sha256:c184485e0dfba4dfd451c3bd348c2e685d6523543a0f91b9fd4ae90eb09e8422 \
+    --hash=sha256:c9cdf251c582c16fd6a9f5e95836c90828d51b0069ad22f463761d27c6c19019 \
+    --hash=sha256:e39cf61bb8582bda88cdfebc0db163b774e7e03364bbf9ce1ead13863e81e359 \
+    --hash=sha256:e8fbc522303e09036c752a0afcc5c0603e917222d8bedc02813fd73b4b4ed804 \
+    --hash=sha256:f34464ab1207114e73bba0794d1257c150a2b89b7a9faf504e00af7c9fd58978 \
+    --hash=sha256:f52dabc96ca99ebd2169dadbe018824ebda08a795c7684a0b7d203a290f3adb0
     # via
     #   gcp-docuploader
     #   gcp-releasetool
diff --git a/setup.py b/setup.py
index ee890d9..5788135 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
     install_requires=(
         "google-api-core[grpc] >= 1.32.0, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*",
         "proto-plus >= 1.22.0, <2.0.0dev",
-        "protobuf >= 3.19.0, <5.0.0dev",
+        "protobuf >= 3.20.2, <5.0.0dev",
     ),
     python_requires=">=3.7",
     classifiers=[
diff --git a/testing/constraints-3.7.txt b/testing/constraints-3.7.txt
index 51901fb..260e08b 100644
--- a/testing/constraints-3.7.txt
+++ b/testing/constraints-3.7.txt
@@ -7,4 +7,4 @@
 # Then this file should have foo==1.14.0
 google-api-core==1.32.0
 proto-plus==1.22.0
-protobuf==3.19.0
+protobuf==3.20.2

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