diff --git a/requirements.txt b/requirements.txt
index 32cc7e668..d601fc90c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ coverage==4.5.4
 coveralls==1.8.2
 coz-bytecode==0.5.1
 docopt==0.6.2
-ecdsa==0.13.2
+ecdsa==0.13.3
 idna==2.8
 logzero==1.5.0
 mmh3==2.5.1
diff --git a/requirements_docs.txt b/requirements_docs.txt
index d1363fb05..8a35ae99a 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -8,7 +8,7 @@ certifi==2018.11.29
 chardet==3.0.4
 coz-bytecode==0.5.1
 docutils==0.14
-ecdsa==0.13
+ecdsa==0.13.3
 idna==2.8
 imagesize==1.1.0
 Jinja2==2.10