diff --git a/default.nix b/default.nix
index 0677b4c94b5..c591fe3051a 100644
--- a/default.nix
+++ b/default.nix
@@ -8,7 +8,9 @@
   # }'
 , sourcesOverride ? { }
   # pinned version of nixpkgs augmented with overlays (iohk-nix and our packages).
-, pkgs ? import ./nix { inherit system crossSystem config sourcesOverride; }
+  , pkgs ? import ./nix { inherit system crossSystem sourcesOverride;
+                          config = { nightly = false; } // config;
+                        }
 , gitrev ? pkgs.iohkNix.commitIdFromGitRepoOrZero ./.git }:
 with pkgs;
 with commonLib;
@@ -61,6 +63,10 @@ let
         haskellPackages.ouroboros-consensus-cardano-test.components.tests.test;
       Shelley =
         haskellPackages.ouroboros-consensus-shelley-test.components.tests.test;
+      ouroboros-network-framework =
+        haskellPackages.ouroboros-network-framework.components.tests.test;
+      ouroboros-network =
+        haskellPackages.ouroboros-network.components.tests.test;
     };
 
     shell = import ./shell.nix {
diff --git a/nix/ouroboros-network.nix b/nix/ouroboros-network.nix
index 12eebf2cef4..e869f38dd1b 100644
--- a/nix/ouroboros-network.nix
+++ b/nix/ouroboros-network.nix
@@ -4,7 +4,8 @@
 { lib, stdenv, pkgs, haskell-nix, buildPackages, config ? { }
   # Enable profiling
 , profiling ? config.haskellNix.profiling or false
-, libsodium-vrf ? pkgs.libsodium-vrf }:
+, libsodium-vrf ? pkgs.libsodium-vrf
+}:
 let
   compiler-nix-name = pkgs.localConfig.ghcVersion;
   src = haskell-nix.haskellLib.cleanGit {
@@ -78,6 +79,7 @@ let
             "xhtml"
             # "stm" "terminfo"
           ];
+          packages.ouroboros-network-testing.flags.nightly = config.nightly;
           # ruby/perl dependencies cannot be cross-built for cddl tests:
           packages.ouroboros-network.flags.cddl = false;
 
@@ -110,6 +112,7 @@ let
       # Options for when not compiling to windows:
       ({ pkgs, ... }:
         lib.mkIf (!pkgs.stdenv.hostPlatform.isWindows) {
+          packages.ouroboros-network-testing.flags.nightly = config.nightly;
           packages.ouroboros-network.flags.cddl = true;
           packages.ouroboros-network.components.tests.cddl.build-tools =
             [ pkgs.cddl pkgs.cbor-diag ];
diff --git a/ouroboros-network-framework/src/Ouroboros/Network/ConnectionManager/Types.hs b/ouroboros-network-framework/src/Ouroboros/Network/ConnectionManager/Types.hs
index f9517a42914..36430050d04 100644
--- a/ouroboros-network-framework/src/Ouroboros/Network/ConnectionManager/Types.hs
+++ b/ouroboros-network-framework/src/Ouroboros/Network/ConnectionManager/Types.hs
@@ -874,7 +874,7 @@ instance Show state
       => Show (Transition' state) where
     show Transition { fromState, toState } =
       concat [ show fromState
-             , " → "
+             , " -> "
              , show toState
              ]
 
diff --git a/ouroboros-network-framework/test/Test/Ouroboros/Network/Server2.hs b/ouroboros-network-framework/test/Test/Ouroboros/Network/Server2.hs
index e07699da519..d8fb3fb478a 100644
--- a/ouroboros-network-framework/test/Test/Ouroboros/Network/Server2.hs
+++ b/ouroboros-network-framework/test/Test/Ouroboros/Network/Server2.hs
@@ -3695,7 +3695,7 @@ splitRemoteConns =
 
 ppTransition :: AbstractTransition -> String
 ppTransition Transition {fromState, toState} =
-    printf "%-30s → %s" (show fromState) (show toState)
+    printf "%-30s -> %s" (show fromState) (show toState)
 
 ppScript :: (Show peerAddr, Show req) => MultiNodeScript peerAddr req -> String
 ppScript (MultiNodeScript script _) = intercalate "\n" $ go 0 script