diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index daabaf4..a74bbdc 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -41,7 +41,7 @@ jobs:
         run: pytest . --benchmark-enable
 
       - name: Prepare merged PGO data.
-        run: rustup run stable bash -c '$RUSTUP_HOME/toolchains/$RUSTUP_TOOLCHAIN/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata'
+        run: rustup run 1.76.0 bash -c '$RUSTUP_HOME/toolchains/$RUSTUP_TOOLCHAIN/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata'
 
       - name: Compile with profile.
         run: pip install -v -e .
diff --git a/Cargo.toml b/Cargo.toml
index d2a5d27..a0f8afc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ name = "libipld"
 crate-type = ["rlib", "cdylib"]
 
 [dependencies]
-pyo3 = { version = "0.21.0-beta.0", features = ["generate-import-lib", "anyhow"] }
+pyo3 = { version = "0.21.0", features = ["generate-import-lib", "anyhow"] }
 python3-dll-a = "0.2.7"
 anyhow = "1.0.75"
 libipld = { version = "0.16.0", features = ["dag-cbor"] }
diff --git a/profiling/Cargo.toml b/profiling/Cargo.toml
index a9a47cc..04bd046 100644
--- a/profiling/Cargo.toml
+++ b/profiling/Cargo.toml
@@ -11,4 +11,4 @@ structopt = "0.3.26"
 clap = "4.5.1"
 
 [dependencies.pyo3]
-version = "0.21.0-beta.0"
+version = "0.21.0"
diff --git a/pytests/requirements.txt b/pytests/requirements.txt
index d5ab836..631d928 100644
--- a/pytests/requirements.txt
+++ b/pytests/requirements.txt
@@ -2,4 +2,3 @@ pytest==7.4.4
 pytest-benchmark==4.0.0
 pytest-codspeed==2.2.0
 pytest-xdist==3.5.0
-pycparser==2.21