diff --git a/CMakeLists.txt b/CMakeLists.txt
index f84e42d..8febac2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,6 +81,7 @@ target_link_options(pico_openpgp PUBLIC
         -Wl,--gc-sections
         )
 endif (APPLE)
+target_link_libraries(pico_openpgp PRIVATE pthread m)
 else()
 
 pico_add_extra_outputs(pico_openpgp)
diff --git a/pico-keys-sdk b/pico-keys-sdk
index 9ac4ebd..3235cd8 160000
--- a/pico-keys-sdk
+++ b/pico-keys-sdk
@@ -1 +1 @@
-Subproject commit 9ac4ebdaedc7e04b078d20caad108fc12cf87794
+Subproject commit 3235cd8595366881ad6c317a007b78a64c87c824