diff --git a/pkgs/python-packages.nix b/pkgs/python-packages.nix
--- a/pkgs/python-packages.nix
+++ b/pkgs/python-packages.nix
@@ -1238,13 +1238,13 @@
     };
   };
   psycopg2 = super.buildPythonPackage {
-    name = "psycopg2-2.7.3.2";
+    name = "psycopg2-2.7.4";
     buildInputs = with self; [];
     doCheck = false;
     propagatedBuildInputs = with self; [];
     src = fetchurl {
-      url = "https://files.pythonhosted.org/packages/dd/47/000b405d73ca22980684fd7bd3318690cc03cfa3b2ae1c5b7fff8050b28a/psycopg2-2.7.3.2.tar.gz";
-      sha256 = "5c3213be557d0468f9df8fe2487eaf2990d9799202c5ff5cb8d394d09fad9b2a";
+      url = "https://files.pythonhosted.org/packages/74/83/51580322ed0e82cba7ad8e0af590b8fb2cf11bd5aaa1ed872661bd36f462/psycopg2-2.7.4.tar.gz";
+      sha256 = "8bf51191d60f6987482ef0cfe8511bbf4877a5aa7f313d7b488b53189cf26209";
     };
     meta = {
       license = [ pkgs.lib.licenses.zpt21 { fullName = "GNU Library or Lesser General Public License (LGPL)"; } { fullName = "LGPL with exceptions or ZPL"; } ];
diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ PasteScript==2.0.2
 pathlib2==2.3.0
 peppercorn==0.5
 psutil==5.4.3
-psycopg2==2.7.3.2
+psycopg2==2.7.4
 py-bcrypt==0.4
 pycrypto==2.6.1
 pycurl==7.19.5