diff --git a/test/wasi/README.md b/test/wasi/README.md
index b99b4fa76d3993c..cf1d137f9a47d95 100644
--- a/test/wasi/README.md
+++ b/test/wasi/README.md
@@ -1,9 +1,15 @@
 # WASI Tests
 
-Compile with clang and `wasm32-wasi` target. The clang version used must be
-built with wasi-libc. You can specify the location for clang and the sysroot
-if needed when running make:
+Compile with clang and `wasm32-wasi` target by using the wasi-sdk
+[version 20](/~https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-20)
 
+Install wasi-sdk and then set WASI_SDK_PATH to the root of the install.
+
+You can then rebuild the wasm for the tests by running:
 ```bash
-make CC=/usr/local/opt/llvm/bin/clang SYSROOT=/path/to/wasi-libc/sysroot
+make CC=${WASI_SDK_PATH}/bin/clang SYSROOT=${WASI_SDK_PATH}/share/wasi-sysroot
 ```
+
+If you update the version of the wasi-sdk to be used for the compile
+remove all of the *.wasm files in the wasm directory to ensure
+you rebuild/test all of the tests with the new version.
diff --git a/test/wasi/c/clock_getres.c b/test/wasi/c/clock_getres.c
index eaac02c665b9f24..2d72c5305f33afe 100644
--- a/test/wasi/c/clock_getres.c
+++ b/test/wasi/c/clock_getres.c
@@ -10,8 +10,11 @@ int main() {
   assert(r == 0);
   r = clock_getres(CLOCK_MONOTONIC, &ts);
   assert(r == 0);
-  r = clock_getres(CLOCK_PROCESS_CPUTIME_ID, &ts);
-  assert(r == 0);
-  r = clock_getres(CLOCK_THREAD_CPUTIME_ID, &ts);
-  assert(r == 0);
+  // don't run these tests until
+  // /~https://github.com/WebAssembly/wasi-libc/issues/266
+  // is resolved
+  // r = clock_getres(CLOCK_PROCESS_CPUTIME_ID, &ts);
+  // assert(r == 0);
+  // r = clock_getres(CLOCK_THREAD_CPUTIME_ID, &ts);
+  // assert(r == 0);
 }
diff --git a/test/wasi/c/poll.c b/test/wasi/c/poll.c
index 9afb6325a98a032..bd2ff62613ea236 100644
--- a/test/wasi/c/poll.c
+++ b/test/wasi/c/poll.c
@@ -10,11 +10,11 @@ int main(void) {
   time_t before, now;
   int ret;
   char* platform;
-  int is_aix;
+  int is_aix_or_os400;
   int is_win;
 
   platform = getenv("NODE_PLATFORM");
-  is_aix = platform != NULL && 0 == strcmp(platform, "aix");
+  is_aix_or_os400 = platform != NULL && (0 == strcmp(platform, "aix") || 0 == strcmp(platform, "os400"));
   is_win = platform != NULL && 0 == strcmp(platform, "win32");
 
   // Test sleep() behavior.
@@ -64,7 +64,7 @@ int main(void) {
   ret = poll(fds, 1, 2000);
   assert(ret == 1);
 
-  if (is_aix)
+  if (is_aix_or_os400)
     assert(fds[0].revents == POLLIN);
   else
     assert(fds[0].revents == (POLLHUP | POLLIN));
diff --git a/test/wasi/c/readdir.c b/test/wasi/c/readdir.c
index a18ae5de34eb8fb..192a00474aab6a4 100644
--- a/test/wasi/c/readdir.c
+++ b/test/wasi/c/readdir.c
@@ -14,7 +14,6 @@ int main() {
 
   platform = getenv("NODE_PLATFORM");
   assert(platform != NULL);
-  has_d_type = (0 != strcmp(platform, "aix") && 0 != strcmp(platform, "sunos"));
 
   dir = opendir("/sandbox");
   assert(dir != NULL);
@@ -25,17 +24,9 @@ int main() {
     if (strcmp(entry->d_name, "input.txt") == 0 ||
         strcmp(entry->d_name, "input2.txt") == 0 ||
         strcmp(entry->d_name, "notadir") == 0) {
-      if (has_d_type) {
         assert(entry->d_type == DT_REG);
-      } else {
-        assert(entry->d_type == DT_UNKNOWN);
-      }
     } else if (strcmp(entry->d_name, "subdir") == 0) {
-      if (has_d_type) {
         assert(entry->d_type == DT_DIR);
-      } else {
-        assert(entry->d_type == DT_UNKNOWN);
-      }
     } else {
       assert("unexpected file");
     }
diff --git a/test/wasi/wasm/cant_dotdot.wasm b/test/wasi/wasm/cant_dotdot.wasm
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diff --git a/test/wasi/wasm/create_symlink.wasm b/test/wasi/wasm/create_symlink.wasm
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diff --git a/test/wasi/wasm/exitcode.wasm b/test/wasi/wasm/exitcode.wasm
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