diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..8f32384
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,17 @@
+# v0.4.0
+
+This is a major rehaul of crate. Older versions are going into deprecation soon, as they are desperately obsolete at this point.
+
+Features:
+
+- `no-std` compatibility
+- External memory support to dynamically access metadata and call without full copy into memory space
+- Shortened metadata support
+- More sane short specs structure
+- Properly parse unchecked extrinsics
+
+Bug fixes:
+
+- Multiple minor fixes in rarely used extrinsic structure
+
+
diff --git a/Cargo.toml b/Cargo.toml
index 0301e7f..42727cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ exclude = ["/for_tests", "/.github"]
 base58 = {version = "0.2.0", optional = true}
 bitvec = {version = "1.0.1", default-features = false, features = ["alloc"]}
 blake2 = {version = "0.10.6", default-features = false, optional = true}
-external-memory-tools = {git = "https://github.com/Alzymologist/external-memory-tools", default-features = false}
+external-memory-tools = {version = "0.1.0", default-features = false}
 frame-metadata = {version = "16.0.0", default-features = false, features = ["current", "decode"]}
 hex = {version = "0.4.3", default-features = false, features = ["alloc"]}
 num-bigint = {version = "0.4.3", default-features = false}