diff --git a/pkgs/applications/networking/gns3/default.nix b/pkgs/applications/networking/gns3/default.nix
index 6e86cfb3d023..72ffbb6e6d3a 100644
--- a/pkgs/applications/networking/gns3/default.nix
+++ b/pkgs/applications/networking/gns3/default.nix
@@ -1,8 +1,8 @@
 { callPackage, stdenv }:
 
 let
-  stableVersion = "2.0.3";
-  previewVersion = "2.1.0rc4";
+  stableVersion = "2.1.0";
+  previewVersion = "2.1.0rc4"; # == 2.1.0
   addVersion = args:
     let version = if args.stable then stableVersion else previewVersion;
         branch = if args.stable then "stable" else "preview";
@@ -12,7 +12,7 @@ let
 in {
   guiStable = mkGui {
     stable = true;
-    sha256Hash = "10qp6430md8d0h2wamgfaq7pai59mqmcw6sw3i1gvb20m0avvsvb";
+    sha256Hash = "0fms8469daa8jhmsdqnadm18gc27g18q4m974wjfpz9n1rn78sjk";
   };
   guiPreview = mkGui {
     stable = false;
@@ -21,7 +21,7 @@ in {
 
   serverStable = mkServer {
     stable = true;
-    sha256Hash = "1c7mzj1r2zh90a7vs3s17jakfp9s43b8nnj29rpamqxvl3qhbdy7";
+    sha256Hash = "1s66qnkhd9rqak13m57i266bgrk8f1ky2wxdha1jj0q9gxdsqa39";
   };
   serverPreview = mkServer {
     stable = false;
diff --git a/pkgs/applications/networking/gns3/gui.nix b/pkgs/applications/networking/gns3/gui.nix
index 1352774953df..df3093504044 100644
--- a/pkgs/applications/networking/gns3/gui.nix
+++ b/pkgs/applications/networking/gns3/gui.nix
@@ -19,7 +19,7 @@ in pythonPackages.buildPythonPackage rec {
   propagatedBuildInputs = with pythonPackages; [
     raven psutil jsonschema # tox for check
     # Runtime dependencies
-    sip pyqt5
+    sip (pyqt5.override { withWebSockets = true; })
   ];
 
   doCheck = false; # Failing
diff --git a/pkgs/applications/networking/gns3/server.nix b/pkgs/applications/networking/gns3/server.nix
index 6e3280b99019..59380cf6965e 100644
--- a/pkgs/applications/networking/gns3/server.nix
+++ b/pkgs/applications/networking/gns3/server.nix
@@ -18,21 +18,11 @@ let
         };
         doInstallCheck = false;
       }));
-  yarl = if (!stable)
-    then (stdenv.lib.overrideDerivation pythonPackages.yarl (oldAttrs:
-      { propagatedBuildInputs = [ multidict_3_1_3 ]; }))
-    else (stdenv.lib.overrideDerivation pythonPackages.yarl (oldAttrs:
-      rec {
-        pname = "yarl";
-        version = "0.9.8";
-        name = "${pname}-${version}";
-        src = pythonPackages.fetchPypi {
-          inherit pname version;
-          sha256 = "1v2dsmr7bqp0yx51pwhbxyvzza8m2f88prsnbd926mi6ah38p0d7";
-        };
-      }));
-  aiohttp = if (!stable)
-    then (stdenv.lib.overrideDerivation pythonPackages.aiohttp (oldAttrs:
+  yarl = (stdenv.lib.overrideDerivation pythonPackages.yarl
+    (oldAttrs:
+      { propagatedBuildInputs = [ multidict_3_1_3 ]; }));
+  aiohttp = (stdenv.lib.overrideDerivation pythonPackages.aiohttp
+    (oldAttrs:
       rec {
         pname = "aiohttp";
         version = "2.2.5";
@@ -43,33 +33,10 @@ let
         };
         propagatedBuildInputs = [ yarl multidict_3_1_3 ]
           ++ (with pythonPackages; [ async-timeout chardet ]);
-      }))
-    else (stdenv.lib.overrideDerivation pythonPackages.aiohttp (oldAttrs:
-      rec {
-        pname = "aiohttp";
-        version = "1.3.5";
-        name = "${pname}-${version}";
-        src = pythonPackages.fetchPypi {
-          inherit pname version;
-          sha256 = "0hpqdiaifgyfqmxkyzwypwvrnvz5rqzgzylzhihfidc5ldfs856d";
-        };
-        propagatedBuildInputs = [ yarl ]
-          ++ (with pythonPackages; [ async-timeout chardet multidict ]);
-      }));
-  aiohttp-cors = if (!stable)
-    then (stdenv.lib.overrideDerivation pythonPackages.aiohttp-cors (oldAttrs:
-      { propagatedBuildInputs = [ aiohttp ]; }))
-    else (stdenv.lib.overrideDerivation pythonPackages.aiohttp-cors (oldAttrs:
-      rec {
-        pname = "aiohttp-cors";
-        version = "0.5.1";
-        name = "${pname}-${version}";
-        src = pythonPackages.fetchPypi {
-          inherit pname version;
-          sha256 = "0szma27ri25fq4nwwvs36myddggw3jz4pyzmq63yz4xpw0jjdxck";
-        };
-        propagatedBuildInputs = [ aiohttp ];
       }));
+  aiohttp-cors = (stdenv.lib.overrideDerivation pythonPackages.aiohttp-cors
+    (oldAttrs:
+      { propagatedBuildInputs = [ aiohttp ]; }));
 in pythonPackages.buildPythonPackage rec {
   name = "${pname}-${version}";
   pname = "gns3-server";
@@ -87,7 +54,7 @@ in pythonPackages.buildPythonPackage rec {
       prompt_toolkit
     ]);
 
-  postPatch = stdenv.lib.optionalString (!stable) ''
+  postPatch = ''
     sed -i 's/yarl>=0.11,<0.12/yarl/g' requirements.txt
   '';