diff --git a/Cargo.lock b/Cargo.lock
index 77d84d418..082fdb9ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1291,9 +1291,9 @@ dependencies = [
 
 [[package]]
 name = "indoc"
-version = "1.0.9"
+version = "2.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa799dd5ed20a7e349f3b4639aa80d74549c81716d9ec4f994c9b5815598306"
+checksum = "1e186cfbae8084e513daff4240b4797e342f988cecda4fb6c939150f96315fd8"
 
 [[package]]
 name = "instant"
@@ -2377,9 +2377,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3"
-version = "0.19.1"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffb88ae05f306b4bfcde40ac4a51dc0b05936a9207a4b75b798c7729c4258a59"
+checksum = "04e8453b658fe480c3e70c8ed4e3d3ec33eb74988bd186561b0cc66b85c3bc4b"
 dependencies = [
  "cfg-if",
  "indoc",
@@ -2394,9 +2394,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-build-config"
-version = "0.19.1"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "554db24f0b3c180a9c0b1268f91287ab3f17c162e15b54caaae5a6b3773396b0"
+checksum = "a96fe70b176a89cff78f2fa7b3c930081e163d5379b4dcdf993e3ae29ca662e5"
 dependencies = [
  "once_cell",
  "target-lexicon",
@@ -2404,9 +2404,9 @@ dependencies = [
 
 [[package]]
 name = "pyo3-ffi"
-version = "0.19.1"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "922ede8759e8600ad4da3195ae41259654b9c55da4f7eec84a0ccc7d067a70a4"
+checksum = "214929900fd25e6604661ed9cf349727c8920d47deff196c4e28165a6ef2a96b"
 dependencies = [
  "libc",
  "pyo3-build-config",
@@ -2414,25 +2414,26 @@ dependencies = [
 
 [[package]]
 name = "pyo3-macros"
-version = "0.19.1"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a5caec6a1dd355964a841fcbeeb1b89fe4146c87295573f94228911af3cc5a2"
+checksum = "dac53072f717aa1bfa4db832b39de8c875b7c7af4f4a6fe93cdbf9264cf8383b"
 dependencies = [
  "proc-macro2",
  "pyo3-macros-backend",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.25",
 ]
 
 [[package]]
 name = "pyo3-macros-backend"
-version = "0.19.1"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0b78ccbb160db1556cdb6fd96c50334c5d4ec44dc5e0a968d0a1208fa0efa8b"
+checksum = "7774b5a8282bd4f25f803b1f0d945120be959a36c72e08e7cd031c792fdfd424"
 dependencies = [
+ "heck",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.25",
 ]
 
 [[package]]
@@ -3210,9 +3211,9 @@ checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
 [[package]]
 name = "unindent"
-version = "0.1.11"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1766d682d402817b5ac4490b3c3002d91dfa0d22812f341609f97b08757359c"
+checksum = "c7de7d73e1754487cb58364ee906a499937a0dfabd86bcb980fa99ec8c8fa2ce"
 
 [[package]]
 name = "url"
diff --git a/nemo-python/Cargo.toml b/nemo-python/Cargo.toml
index 0cd73aa25..cd5b489f9 100644
--- a/nemo-python/Cargo.toml
+++ b/nemo-python/Cargo.toml
@@ -14,5 +14,5 @@ name = "nmo_python"
 crate-type = ["cdylib"]
 
 [dependencies]
-pyo3 = { version = "0.19", features = [ "extension-module" ] }
+pyo3 = { version = "0.20", features = [ "extension-module" ] }
 nemo = { path = "../nemo" }