diff --git a/bitty b/bitty
new file mode 160000
index 0000000..fb8e052
--- /dev/null
+++ b/bitty
@@ -0,0 +1 @@
+Subproject commit fb8e05231f5681b1f7ad037b89f4ebe22f89a547
diff --git a/nimsimd b/nimsimd
new file mode 160000
index 0000000..216cd5f
--- /dev/null
+++ b/nimsimd
@@ -0,0 +1 @@
+Subproject commit 216cd5f93f1e1dd1b6ab63bd46cffad27ce991e4
diff --git a/pixie.nimble b/pixie.nimble
index 476da3b..c14ed57 100644
--- a/pixie.nimble
+++ b/pixie.nimble
@@ -8,7 +8,7 @@ srcDir = "src"
 requires "nim >= 1.4.8"
 requires "vmath >= 1.1.4"
 requires "chroma >= 0.2.5"
-requires "zippy >= 0.9.7"
+requires "zippy >= 0.9.9"
 requires "flatty >= 0.3.3"
 requires "nimsimd >= 1.0.0"
 requires "bumpy >= 1.1.1"