diff --git a/ci.nix b/ci.nix
index cbef43e89..4a82a1e03 100644
--- a/ci.nix
+++ b/ci.nix
@@ -89,7 +89,7 @@
     inherit (lib.systems.examples) ghcjs;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
       && (__match ".*llvm" compiler-nix-name == null)
-      && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc902" "ghc928" "ghc966" "ghc967" "ghc96720250227"]) # Not sure why GHC 9.6.6 TH code now wants `log1pf`
+      && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc902" "ghc928"])
        || (system == "x86_64-darwin" && builtins.elem compiler-nix-name []))) { # TODO add ghc versions when we have more darwin build capacity
     inherit (lib.systems.examples) mingwW64;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
diff --git a/flake.lock b/flake.lock
index 8cf31216e..d53e94400 100644
--- a/flake.lock
+++ b/flake.lock
@@ -405,11 +405,11 @@
     "iserv-proxy": {
       "flake": false,
       "locked": {
-        "lastModified": 1749443511,
-        "narHash": "sha256-asfdanBoIUcJ9XQWB3a/5wQGFG/6Uq6l2s9r8OuamkY=",
+        "lastModified": 1750543273,
+        "narHash": "sha256-WaswH0Y+Fmupvv8AkIlQBlUy/IdD3Inx9PDuE+5iRYY=",
         "owner": "stable-haskell",
         "repo": "iserv-proxy",
-        "rev": "e40eddb1ca1e3e906e018c7e6b0d1e51c930ec9d",
+        "rev": "a53c57c9a8d22a66a2f0c4c969e806da03f08c28",
         "type": "github"
       },
       "original": {
diff --git a/overlays/bootstrap.nix b/overlays/bootstrap.nix
index 5fe966e4a..13ee8670e 100644
--- a/overlays/bootstrap.nix
+++ b/overlays/bootstrap.nix
@@ -230,8 +230,9 @@ in {
                 # This one will lead to segv's on darwin, when calling `strlen` during lookupStrHashTable. `strlen` ends up being called with 0x0.
                 # This patch will allow adding additional symbols to iserv, instead of having to patch them into GHC all the time.
                 ++ final.lib.optionals (
-                        (final.stdenv.targetPlatform.isAndroid || final.stdenv.targetPlatform.isLinux)
-                     && (final.stdenv.targetPlatform.isAarch64 || final.stdenv.targetPlatform.is32bit))
+                     final.stdenv.targetPlatform.isWindows ||
+                     (  (final.stdenv.targetPlatform.isAndroid || final.stdenv.targetPlatform.isLinux)
+                     && (final.stdenv.targetPlatform.isAarch64 || final.stdenv.targetPlatform.is32bit)))
                   (fromUntil "9.6.1" "9.11" ./patches/ghc/iserv-syms.patch)
                 ++ onAndroid (until "9.0" ./patches/ghc/ghc-8.10.7-weak-symbols-2.patch)
                 ++ onDarwin (onAarch64 (until "9.0" ./patches/ghc/ghc-8.10.7-rts-aarch64-darwin.patch))
diff --git a/test/cabal.project.local b/test/cabal.project.local
index 5c36c9fe2..2eb294ac1 100644
--- a/test/cabal.project.local
+++ b/test/cabal.project.local
@@ -29,7 +29,7 @@ repository head.hackage.ghc.haskell.org
      f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89
      26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329
      7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d
-  --sha256: sha256-Zu+OsPXt+tUllxC2LVJ3jneYGUH5GvdemZZPnynWaN0=
+  --sha256: sha256-Fn+JdHvwpbhYz5ffZU6+2HFZHLMLgah564mMdyUHKL4=
 
 repository ghcjs-overlay
   url: https://raw.githubusercontent.com/input-output-hk/hackage-overlay-ghcjs/ffb32dce467b9a4d27be759fdd2740a6edd09d0b
diff --git a/test/th-dlls/default.nix b/test/th-dlls/default.nix
index 33315dc01..50f838fd4 100644
--- a/test/th-dlls/default.nix
+++ b/test/th-dlls/default.nix
@@ -43,7 +43,9 @@ in recurseIntoAttrs {
   build-ei = packages-ei.th-dlls.components.library;
   just-template-haskell-ei = packages-ei.th-dlls.components.exes.just-template-haskell;
 } // optionalAttrs
-    (!(builtins.elem compiler-nix-name ["ghc984" "ghc9122" "ghc91320250523"]  && stdenv.buildPlatform.isx86_64 && stdenv.hostPlatform.isAarch64)) {
+    (!(builtins.elem compiler-nix-name ["ghc984" "ghc9122" "ghc91320250523"]  && stdenv.buildPlatform.isx86_64 && stdenv.hostPlatform.isAarch64
+      # The dependency on `math-functions` somehow breaks GHC 9.6.7 musl profiled builds (only with the external interpreter though)
+      || (compiler-nix-name == "ghc967" && stdenv.hostPlatform.isMusl && stdenv.hostPlatform.isx86_64))) {
   # On for aarch64 cross compile on GHC this test is fails sometimes for non profiled builds
   # (and always for the profiled builds).
   # This may be related to the memory allocation changes made in 9.8.4 that
diff --git a/test/th-dlls/th-dlls.cabal b/test/th-dlls/th-dlls.cabal
index a0c19dfad..192b39dfc 100644
--- a/test/th-dlls/th-dlls.cabal
+++ b/test/th-dlls/th-dlls.cabal
@@ -15,6 +15,9 @@ library
                      , double-conversion
                      , unix-time
                      , th-orphans
+                     , ghc-prim
+                     , math-functions
+                     , erf
   exposed-modules:     Lib
   hs-source-dirs:      src
   default-language:    Haskell2010