diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04c672730..124d0c47c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -351,10 +351,9 @@ if(NOT GEKKO AND NOT NX)
   endif ()
 endif()
 
-if (APPLE)
-  # use toolchain zlib
+if (NOT WIN32)
   find_package(ZLIB REQUIRED)
-  set(ZLIB_LIBRARIES ZLIB::ZLIB)
+  set(ZLIB_LIBRARIES ZLIB::ZLIB CACHE STRING "zlib libraries" FORCE)
 endif()
 
 if (NOT BUILD_ATDNA)
diff --git a/extern/athena b/extern/athena
index 8558ca1b5..991ffede7 160000
--- a/extern/athena
+++ b/extern/athena
@@ -1 +1 @@
-Subproject commit 8558ca1b5111ebe83ee44b1200b0b0d1d94f2fa2
+Subproject commit 991ffede795a60b3bf8765601afda1ef02424ee8