diff --git a/requirements.txt b/requirements.txt
index f1a13cae..8e2e6a7b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ cryptography==2.2.2
 curtsies==0.3.0
 cycler==0.10.0
 docopt==0.6.2
-ecdsa==0.13
+ecdsa==0.13.3
 Events==0.3
 gevent==1.2.2
 greenlet==0.4.13
diff --git a/requirements_docs.txt b/requirements_docs.txt
index c0cde52c..7f04cf87 100644
--- a/requirements_docs.txt
+++ b/requirements_docs.txt
@@ -23,7 +23,7 @@ curtsies==0.2.11
 cycler==0.10.0
 docopt==0.6.2
 docutils==0.14
-ecdsa==0.13
+ecdsa==0.13.3
 Events==0.3
 gevent==1.2.2
 greenlet==0.4.12
@@ -95,7 +95,7 @@ curtsies==0.2.11
 cycler==0.10.0
 docopt==0.6.2
 docutils==0.14
-ecdsa==0.13
+ecdsa==0.13.3
 Events==0.3
 gevent==1.2.2
 greenlet==0.4.12