diff --git a/requirements.txt b/requirements.txt
index 67f923c..f843015 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -79,26 +79,21 @@ chardet==3.0.4 \
 certifi==2019.11.28 \
     --hash=sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3 \
     --hash=sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f
-protobuf==3.11.3 \
-    --hash=sha256:0bae429443cc4748be2aadfdaf9633297cfaeb24a9a02d0ab15849175ce90fab \
-    --hash=sha256:24e3b6ad259544d717902777b33966a1a069208c885576254c112663e6a5bb0f \
-    --hash=sha256:2affcaba328c4662f3bc3c0e9576ea107906b2c2b6422344cdad961734ff6b93 \
-    --hash=sha256:310a7aca6e7f257510d0c750364774034272538d51796ca31d42c3925d12a52a \
-    --hash=sha256:52e586072612c1eec18e1174f8e3bb19d08f075fc2e3f91d3b16c919078469d0 \
-    --hash=sha256:73152776dc75f335c476d11d52ec6f0f6925774802cd48d6189f4d5d7fe753f4 \
-    --hash=sha256:7774bbbaac81d3ba86de646c39f154afc8156717972bf0450c9dbfa1dc8dbea2 \
-    --hash=sha256:82d7ac987715d8d1eb4068bf997f3053468e0ce0287e2729c30601feb6602fee \
-    --hash=sha256:8eb9c93798b904f141d9de36a0ba9f9b73cc382869e67c9e642c0aba53b0fc07 \
-    --hash=sha256:adf0e4d57b33881d0c63bb11e7f9038f98ee0c3e334c221f0858f826e8fb0151 \
-    --hash=sha256:c40973a0aee65422d8cb4e7d7cbded95dfeee0199caab54d5ab25b63bce8135a \
-    --hash=sha256:c77c974d1dadf246d789f6dad1c24426137c9091e930dbf50e0a29c1fcf00b1f \
-    --hash=sha256:dd9aa4401c36785ea1b6fff0552c674bdd1b641319cb07ed1fe2392388e9b0d7 \
-    --hash=sha256:e11df1ac6905e81b815ab6fd518e79be0a58b5dc427a2cf7208980f30694b956 \
-    --hash=sha256:e2f8a75261c26b2f5f3442b0525d50fd79a71aeca04b5ec270fc123536188306 \
-    --hash=sha256:e512b7f3a4dd780f59f1bf22c302740e27b10b5c97e858a6061772668cd6f961 \
-    --hash=sha256:ef2c2e56aaf9ee914d3dccc3408d42661aaf7d9bb78eaa8f17b2e6282f214481 \
-    --hash=sha256:fac513a9dc2a74b99abd2e17109b53945e364649ca03d9f7a0b96aa8d1807d0a \
-    --hash=sha256:fdfb6ad138dbbf92b5dbea3576d7c8ba7463173f7d2cb0ca1bd336ec88ddbd80
+protobuf==4.21.0 \
+    --hash=sha256:14c5fa41122e270d815b954ecdc25cb107d44b7d039def5cc57a5e5a9ab8d741 \
+    --hash=sha256:157e4ad67bf75d5719516fbf13fd652c634fd71338e01d2ac872bf365213b7a6 \
+    --hash=sha256:182b626615043e191e994672b7bbf1036bad5edc9f8f300a2f3a1fe77409a444 \
+    --hash=sha256:2188063b59e1606cc45a1ad68beae7b94bec36e6d27d5e857dd611b79cdda99f \
+    --hash=sha256:2c753c5aa0943479a3f84b90e8c5bb28fef8cc3eb79c2c35e1bbf00d56cc435f \
+    --hash=sha256:4e78116673ba04e01e563f6a9cca2c72db0be8a3e1629094816357e81cc39d36 \
+    --hash=sha256:6efbe40afb1b0303def53b3c5ce211b14e10d73d63a3f8b669ac0e3b74e8f863 \
+    --hash=sha256:9a65e012bc06022e98a57165ea48438b3b9f652eee33db7cbecb883588f9f169 \
+    --hash=sha256:b33660b14d582a700a47c8808a3f2da33f5bb3be576a8ae419d608db6b4f19b0 \
+    --hash=sha256:bc78d6c23873ebf33076f0851ef64d050e7246d5b1e651b38a7e92c05f14881d \
+    --hash=sha256:c8fc31d44e239178da6a698e0b69798387469b89172de3470a49d799550523a7 \
+    --hash=sha256:c92a9e2a94b9df945a6c578c3f53ace862ed3a50e849f41c27106007cc63ca8c \
+    --hash=sha256:da3bb1acd646f01b4bdec128462441838e596899c5a5e1d2e8e31975f36cd0c4 \
+    --hash=sha256:f12e26fda74c40f308d37525e5276883388f25ff9a0c880f40f79d3ce9097d81
 Jinja2==2.11.3 \
     --hash=sha256:03e47ad063331dd6a3f04a43eddca8a966a26ba0c5b7207a9a9e4e08f1b29419 \
     --hash=sha256:a6d58433de0ae800347cab1fa3043cebbabe8baa9d29e668f1c768cb87a333c6