diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 39b61e51..b1a27ccf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -53,7 +53,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.58.0
+          - 1.63.0
     steps:
       - name: Checkout Crate
         uses: actions/checkout@v4
diff --git a/Cargo.toml b/Cargo.toml
index adea43c7..3dee54db 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,12 +8,12 @@ repository = "https://github.com/BlockstreamResearch/rust-simplicity/"
 documentation = "https://docs.rs/simplicity-lang/"
 description = "General purpose library for processing Simplicity programs"
 edition = "2021"
-rust-version = "1.58.0"
+rust-version = "1.63.0"
 
 [features]
 default = ["bitcoin", "elements"]
 test-utils = ["simplicity-sys/test-utils"]
-serde = ["actual-serde", "bitcoin/serde", "elements/serde"]
+serde = ["dep:serde", "bitcoin/serde", "elements/serde"]
 
 [lib]
 name = "simplicity"
@@ -28,9 +28,7 @@ hashes = { package = "bitcoin_hashes", version = "0.13" }
 hex = { package = "hex-conservative", version = "0.1.1" }
 santiago = "1.3"
 simplicity-sys = { version = "0.2.0", path = "./simplicity-sys" }
-actual-serde = { package = "serde", version = "1.0.103", features = [
-    "derive",
-], optional = true }
+serde = { version = "1.0.103", features = ["derive"], optional = true }
 
 [target.wasm32-unknown-unknown.dependencies]
 getrandom = { version = "0.2", features = ["js"] }
diff --git a/README.md b/README.md
index d748a1ef..14ae706d 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Under development....
 
 # Minimum Supported Rust Version
 
-The MSRV of this crate is **1.58.0**.
+The MSRV of this crate is **1.63.0**.
 
 # Updating jets code
 
diff --git a/clippy.toml b/clippy.toml
index 77173243..31a5c0d2 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1,4 +1,4 @@
-msrv = "1.58.0"
+msrv = "1.63.0"
 
 # Default 250, not sure what units. But it does not like the generic node stuff.
 type-complexity-threshold = 1000
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 38088aea..591a7491 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "simplicity-fuzz"
 edition = "2021"
-rust-version = "1.58.0"
+rust-version = "1.63.0"
 version = "0.0.1"
 authors = ["Generated by fuzz/generate-files.sh"]
 publish = false
diff --git a/fuzz/generate-files.sh b/fuzz/generate-files.sh
index 74869cc5..21a992e9 100755
--- a/fuzz/generate-files.sh
+++ b/fuzz/generate-files.sh
@@ -12,7 +12,7 @@ cat > "$REPO_DIR/fuzz/Cargo.toml" <<EOF
 [package]
 name = "simplicity-fuzz"
 edition = "2021"
-rust-version = "1.58.0"
+rust-version = "1.63.0"
 version = "0.0.1"
 authors = ["Generated by fuzz/generate-files.sh"]
 publish = false
diff --git a/simplicity-sys/Cargo.toml b/simplicity-sys/Cargo.toml
index 2fa9803c..e9f8cb5e 100644
--- a/simplicity-sys/Cargo.toml
+++ b/simplicity-sys/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/BlockstreamResearch/rust-simplicity/"
 documentation = "https://docs.rs/simplicity-sys/"
 description = "FFI bindings to libsimplicity"
 edition = "2021"
-rust-version = "1.58.0"
+rust-version = "1.63.0"
 
 [build-dependencies]
 cc = "1.0.83"
diff --git a/src/lib.rs b/src/lib.rs
index af4fe8a2..6c0a6746 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,12 +9,12 @@
     clippy::map_clone
 )]
 
-#[cfg(feature = "serde")]
-pub extern crate actual_serde as serde;
 #[cfg(feature = "bitcoin")]
 pub extern crate bitcoin;
 #[cfg(feature = "elements")]
 pub extern crate elements;
+#[cfg(feature = "serde")]
+pub extern crate serde;
 
 /// Re-export of byteorder crate
 pub extern crate byteorder;
diff --git a/src/types/precomputed.rs b/src/types/precomputed.rs
index fb67ae32..990258c4 100644
--- a/src/types/precomputed.rs
+++ b/src/types/precomputed.rs
@@ -24,7 +24,7 @@ use std::sync::Arc;
 const N_POWERS: usize = Tmr::POWERS_OF_TWO.len();
 
 thread_local! {
-    static POWERS_OF_TWO: RefCell<Option<[Arc<Final>; N_POWERS]>> = RefCell::new(None);
+    static POWERS_OF_TWO: RefCell<Option<[Arc<Final>; N_POWERS]>> = const { RefCell::new(None) };
 }
 
 fn initialize(write: &mut Option<[Arc<Final>; N_POWERS]>) {