diff --git a/requirements.txt b/requirements.txt
index 1c6ab8f..df04b65 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ sympy==1.5.1
 cryptography==2.8
 seaborn==0.9.0
 pyOpenSSL==19.0.0
-brotli==1.0.7
+brotli==1.0.9
 protobuf==3.11.3
 ipaddr==2.2.0
 mock==3.0.5
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 1c6ab8f..df04b65 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -8,7 +8,7 @@ sympy==1.5.1
 cryptography==2.8
 seaborn==0.9.0
 pyOpenSSL==19.0.0
-brotli==1.0.7
+brotli==1.0.9
 protobuf==3.11.3
 ipaddr==2.2.0
 mock==3.0.5
diff --git a/requirements/prod.txt b/requirements/prod.txt
index 1c6ab8f..df04b65 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -8,7 +8,7 @@ sympy==1.5.1
 cryptography==2.8
 seaborn==0.9.0
 pyOpenSSL==19.0.0
-brotli==1.0.7
+brotli==1.0.9
 protobuf==3.11.3
 ipaddr==2.2.0
 mock==3.0.5
diff --git a/requirements/test.txt b/requirements/test.txt
index 1c6ab8f..df04b65 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -8,7 +8,7 @@ sympy==1.5.1
 cryptography==2.8
 seaborn==0.9.0
 pyOpenSSL==19.0.0
-brotli==1.0.7
+brotli==1.0.9
 protobuf==3.11.3
 ipaddr==2.2.0
 mock==3.0.5