diff --git a/Cargo.lock b/Cargo.lock
index a76738d..6d70294 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -291,9 +291,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a02a88a17e74cadbc8ce77855e1d6c8ad0ab82901a4a9b5046bd01c1c0bd95cd"
+checksum = "a7a8b1990bd018761768d5e608a13df8bd1ac5f678456e0f301bb93e5f3ea16b"
 dependencies = [
  "cfg-if",
  "indoc",
@@ -309,9 +309,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5eb0b6ecba38961f6f4bd6cd5906dfab3cd426ff37b2eed5771006aa31656f1"
+checksum = "650dca34d463b6cdbdb02b1d71bfd6eb6b6816afc708faebb3bac1380ff4aef7"
 dependencies = [
  "once_cell",
  "target-lexicon",
@@ -319,9 +319,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba8a6e48a29b5d22e4fdaf132d8ba8d3203ee9f06362d48f244346902a594ec3"
+checksum = "09a7da8fc04a8a2084909b59f29e1b8474decac98b951d77b80b26dc45f046ad"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -329,9 +329,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e80493c5965f94a747d0782a607b2328a4eea5391327b152b00e2f3b001cede"
+checksum = "4b8a199fce11ebb28e3569387228836ea98110e43a804a530a9fd83ade36d513"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
@@ -341,9 +341,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcd7d86f42004025200e12a6a8119bd878329e6fddef8178eaafa4e4b5906c5b"
+checksum = "93fbbfd7eb553d10036513cb122b888dcd362a945a00b06c165f2ab480d4cc3b"
 dependencies = [
  "heck",
  "proc-macro2",
diff --git a/Cargo.toml b/Cargo.toml
index dcd7654..b71f95c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,4 +15,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 ammonia = "4.0.0"
-pyo3 = { version = "0.21.0", features = ["abi3-py37", "gil-refs"] }
+pyo3 = { version = "0.21.1", features = ["abi3-py37", "gil-refs"] }