diff --git a/eden/scm/edenscmnative/bindings/Cargo.toml b/eden/scm/edenscmnative/bindings/Cargo.toml
index 79780f08ac..86e2a6d245 100644
--- a/eden/scm/edenscmnative/bindings/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/Cargo.toml
@@ -12,7 +12,7 @@ incremental = true
 lto = false
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 env_logger = "0.7"
 pyblackbox = { path = "modules/pyblackbox" }
 pybookmarkstore = { path = "modules/pybookmarkstore" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyblackbox/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyblackbox/Cargo.toml
index eace9abe24..8a03b67b07 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyblackbox/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyblackbox/Cargo.toml
@@ -6,4 +6,4 @@ edition = "2018"
 [dependencies]
 blackbox = { path = "../../../../lib/blackbox" }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
diff --git a/eden/scm/edenscmnative/bindings/modules/pybookmarkstore/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pybookmarkstore/Cargo.toml
index 8741f181f5..fc5181e15f 100644
--- a/eden/scm/edenscmnative/bindings/modules/pybookmarkstore/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pybookmarkstore/Cargo.toml
@@ -5,6 +5,6 @@ edition = "2018"
 
 [dependencies]
 bookmarkstore = { path = "../../../../lib/bookmarkstore" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 types = { path = "../../../../lib/types" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pycliparser/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pycliparser/Cargo.toml
index 75ef3012c7..a3bbe81cf4 100644
--- a/eden/scm/edenscmnative/bindings/modules/pycliparser/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pycliparser/Cargo.toml
@@ -7,5 +7,5 @@ edition = "2018"
 clidispatch = { path = "../../../../lib/clidispatch" }
 cliparser = { path = "../../../../lib/cliparser", features = ["python"] }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 pyconfigparser = { path = "../pyconfigparser" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pycommands/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pycommands/Cargo.toml
index 9d4bcefb4a..2479a857f3 100644
--- a/eden/scm/edenscmnative/bindings/modules/pycommands/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pycommands/Cargo.toml
@@ -6,5 +6,5 @@ edition = "2018"
 [dependencies]
 clidispatch = { path = "../../../../lib/clidispatch" }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 hgcommands = { path = "../../../../lib/hgcommands" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyconfigparser/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyconfigparser/Cargo.toml
index 0715381c8f..7db45550e9 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyconfigparser/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyconfigparser/Cargo.toml
@@ -6,6 +6,6 @@ edition = "2018"
 [dependencies]
 bytes = "0.4.11"
 configparser = { path = "../../../../lib/configparser" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 util = { path = "../../../../lib/util" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pydag/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pydag/Cargo.toml
index 19fe564cc5..e415890d93 100644
--- a/eden/scm/edenscmnative/bindings/modules/pydag/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pydag/Cargo.toml
@@ -5,6 +5,6 @@ edition = "2018"
 
 [dependencies]
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 dag = { path = "../../../../lib/dag" }
 anyhow = "1.0.20"
diff --git a/eden/scm/edenscmnative/bindings/modules/pyedenapi/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyedenapi/Cargo.toml
index dbd4316c5b..6a28224c49 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyedenapi/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyedenapi/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 [dependencies]
 bytes = "0.4"
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 edenapi = { path = "../../../../lib/edenapi" }
 pyrevisionstore = { path = "../pyrevisionstore" }
 revisionstore = { path = "../../../../lib/revisionstore" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyerror/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyerror/Cargo.toml
index 6afbb29b48..9b07db7c32 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyerror/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyerror/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 indexedlog = { path = "../../../../lib/indexedlog" }
 metalog = { path = "../../../../lib/metalog" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyhgtime/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyhgtime/Cargo.toml
index e66858cf34..557936ec5c 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyhgtime/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyhgtime/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 hgtime = { path = "../../../../lib/hgtime" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyindexes/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyindexes/Cargo.toml
index eea00eca0e..cc0cd19853 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyindexes/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyindexes/Cargo.toml
@@ -15,9 +15,9 @@ anyhow = "1.0.20"
 thiserror = "1.0.5"
 
 [dependencies.cpython]
-version = "0.3"
+version = "0.4"
 default-features = false
 features = ["python27-sys"]
 
 [dependencies.python27-sys]
-version = "0.3"
+version = "0.4"
diff --git a/eden/scm/edenscmnative/bindings/modules/pylz4/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pylz4/Cargo.toml
index a73e3e68e4..3b641b7cac 100644
--- a/eden/scm/edenscmnative/bindings/modules/pylz4/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pylz4/Cargo.toml
@@ -5,5 +5,5 @@ edition = "2018"
 
 [dependencies]
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 lz4-pyframe = { path = "../../../../lib/lz4-pyframe" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pymanifest/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pymanifest/Cargo.toml
index daedc3dafd..7f2dbc3917 100644
--- a/eden/scm/edenscmnative/bindings/modules/pymanifest/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pymanifest/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 anyhow = "1.0.20"
 bytes = { version = "0.4.11" }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 manifest = { path = "../../../../lib/manifest" }
 manifest-tree = { path = "../../../../lib/manifest-tree" }
 pathmatcher = { path = "../../../../lib/pathmatcher" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pymetalog/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pymetalog/Cargo.toml
index 16840c7f13..8ddae55faa 100644
--- a/eden/scm/edenscmnative/bindings/modules/pymetalog/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pymetalog/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 metalog = { path = "../../../../lib/metalog" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pymutationstore/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pymutationstore/Cargo.toml
index 382a687221..dcdbcde833 100644
--- a/eden/scm/edenscmnative/bindings/modules/pymutationstore/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pymutationstore/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 anyhow = "1.0.20"
 byteorder = "1.2.7"
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 mutationstore = { path = "../../../../lib/mutationstore" }
 thiserror = "1.0.5"
 types = { path = "../../../../lib/types" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pynodemap/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pynodemap/Cargo.toml
index 7fea3547ed..f7833c2249 100644
--- a/eden/scm/edenscmnative/bindings/modules/pynodemap/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pynodemap/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 nodemap = { path = "../../../../lib/nodemap" }
 types = { path = "../../../../lib/types" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pypathmatcher/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pypathmatcher/Cargo.toml
index b47561227f..6892522b7f 100644
--- a/eden/scm/edenscmnative/bindings/modules/pypathmatcher/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pypathmatcher/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2018"
 
 [dependencies]
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 encoding = { path = "../../../../lib/encoding" }
 pathmatcher = { path = "../../../../lib/pathmatcher" }
 types = { path = "../../../../lib/types" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrenderdag/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyrenderdag/Cargo.toml
index 53cf95f76e..531b3a9799 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrenderdag/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyrenderdag/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 renderdag = { path = "../../../../lib/renderdag" }
 parking_lot = "0.9"
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/Cargo.toml
index 4aca05c671..816f1f044c 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.20"
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 parking_lot = "0.9.0"
 pyconfigparser = { path = "../pyconfigparser" }
 revisionstore = { path = "../../../../lib/revisionstore" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/datastorepyext.rs b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/datastorepyext.rs
index 2d0eca1fec..5543897d3f 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/datastorepyext.rs
+++ b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/datastorepyext.rs
@@ -136,7 +136,7 @@ impl<T: DataStore + ?Sized> DataStorePyExt for T {
         let results = PyList::new(py, &[]);
         for key in missing {
             let key_tuple = from_key_to_tuple(py, &key);
-            results.insert_item(py, results.len(py), key_tuple.into_object());
+            results.append(py, key_tuple.into_object());
         }
 
         Ok(results)
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/historystorepyext.rs b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/historystorepyext.rs
index f6b445257b..790e00aee3 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/historystorepyext.rs
+++ b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/historystorepyext.rs
@@ -59,7 +59,7 @@ impl<T: HistoryStore + ?Sized> HistoryStorePyExt for T {
         let results = PyList::new(py, &[]);
         for key in missing {
             let key_tuple = from_key_to_tuple(py, &key);
-            results.insert_item(py, results.len(py), key_tuple.into_object());
+            results.append(py, key_tuple.into_object());
         }
 
         Ok(results)
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/pythondatastore.rs b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/pythondatastore.rs
index 7e01cbf1c1..5e9520072d 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/pythondatastore.rs
+++ b/eden/scm/edenscmnative/bindings/modules/pyrevisionstore/src/pythondatastore.rs
@@ -175,7 +175,7 @@ impl LocalStore for PythonDataStore {
         let py_missing = PyList::new(py, &[]);
         for key in keys.iter() {
             let py_key = from_key_to_tuple(py, &key);
-            py_missing.insert_item(py, py_missing.len(py), py_key.into_object());
+            py_missing.append(py, py_key.into_object());
         }
 
         let py_missing = self
diff --git a/eden/scm/edenscmnative/bindings/modules/pyrevlogindex/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyrevlogindex/Cargo.toml
index 6f70a68b48..37d3758168 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyrevlogindex/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyrevlogindex/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 dag = { path = "../../../../lib/dag" }
 pydag = { path = "../pydag" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pystackdesc/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pystackdesc/Cargo.toml
index d986a2b63b..9d9c1da699 100644
--- a/eden/scm/edenscmnative/bindings/modules/pystackdesc/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pystackdesc/Cargo.toml
@@ -4,5 +4,5 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 stackdesc = { path = "../../../../lib/stackdesc/" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pythreading/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pythreading/Cargo.toml
index 74f8cf28cc..8cb1dee118 100644
--- a/eden/scm/edenscmnative/bindings/modules/pythreading/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pythreading/Cargo.toml
@@ -9,9 +9,9 @@ lto = "thin"
 [dependencies]
 
 [dependencies.cpython]
-version = "0.3"
+version = "0.4"
 default-features = false
 features = ["python27-sys"]
 
 [dependencies.python27-sys]
-version = "0.3"
+version = "0.4"
diff --git a/eden/scm/edenscmnative/bindings/modules/pytracing/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pytracing/Cargo.toml
index 402e6c8ef4..f36c8bad9f 100644
--- a/eden/scm/edenscmnative/bindings/modules/pytracing/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pytracing/Cargo.toml
@@ -10,11 +10,11 @@ python3 = []
 
 [dependencies]
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 lazy_static = "1"
 mincode = { path = "../../../../lib/mincode" }
 parking_lot = "0.9"
-python27-sys = "0.3"
+python27-sys = "0.4"
 serde_json = "1"
 tracing = "0.1"
 tracing-collector = { path = "../../../../lib/tracing-collector" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pytreestate/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pytreestate/Cargo.toml
index 39fac86f53..59fb796f4f 100644
--- a/eden/scm/edenscmnative/bindings/modules/pytreestate/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pytreestate/Cargo.toml
@@ -6,5 +6,5 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.20"
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 treestate = { path = "../../../../lib/treestate" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyvlq/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyvlq/Cargo.toml
index 4a52fd4108..9a105a4ce4 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyvlq/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyvlq/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 vlqencoding = { path = "../../../../lib/vlqencoding" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyworkingcopy/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyworkingcopy/Cargo.toml
index d67311cafb..dce2820476 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyworkingcopy/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyworkingcopy/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0.20"
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 encoding = { path = "../../../../lib/encoding" }
 pathmatcher = { path = "../../../../lib/pathmatcher" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyzstd/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyzstd/Cargo.toml
index 314a8492c5..c125437210 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyzstd/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyzstd/Cargo.toml
@@ -5,6 +5,6 @@ edition = "2018"
 
 [dependencies]
 cpython-ext = { path = "../../../../lib/cpython-ext" }
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 zstd = "0.4.18"
 zstdelta = { path = "../../../../lib/zstdelta/" }
diff --git a/eden/scm/edenscmnative/bindings/modules/pyzstore/Cargo.toml b/eden/scm/edenscmnative/bindings/modules/pyzstore/Cargo.toml
index d0058545bb..c8f9f96565 100644
--- a/eden/scm/edenscmnative/bindings/modules/pyzstore/Cargo.toml
+++ b/eden/scm/edenscmnative/bindings/modules/pyzstore/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2018"
 
 [dependencies]
-cpython = { version = "0.3", features = ["python27-sys"], default-features = false }
+cpython = { version = "0.4", features = ["python27-sys"], default-features = false }
 cpython-ext = { path = "../../../../lib/cpython-ext" }
 zstore = { path = "../../../../lib/zstore" }
diff --git a/eden/scm/lib/cliparser/Cargo.toml b/eden/scm/lib/cliparser/Cargo.toml
index c9be22edb8..1c7e750da6 100644
--- a/eden/scm/lib/cliparser/Cargo.toml
+++ b/eden/scm/lib/cliparser/Cargo.toml
@@ -12,7 +12,7 @@ cpython-ext = { path = "../cpython-ext", optional = true }
 thiserror = "1.0.5"
 
 [dependencies.cpython]
-version = "0.3"
+version = "0.4"
 default-features = false
 features = ["python27-sys"]
 optional = true
diff --git a/eden/scm/lib/cpython-ext/Cargo.toml b/eden/scm/lib/cpython-ext/Cargo.toml
index 773d3e5cbf..bbcef261c3 100644
--- a/eden/scm/lib/cpython-ext/Cargo.toml
+++ b/eden/scm/lib/cpython-ext/Cargo.toml
@@ -17,9 +17,9 @@ parking_lot = "0.9"
 serde = "1"
 
 [dependencies.cpython]
-version = "0.3"
+version = "0.4"
 default-features = false
 features = ["python27-sys"]
 
 [dependencies.python27-sys]
-version = "0.3"
+version = "0.4"
diff --git a/eden/scm/lib/hgcommands/Cargo.toml b/eden/scm/lib/hgcommands/Cargo.toml
index 8c2d670f5d..2390c7cf19 100644
--- a/eden/scm/lib/hgcommands/Cargo.toml
+++ b/eden/scm/lib/hgcommands/Cargo.toml
@@ -36,9 +36,9 @@ zstd = "0.4"
 path = "../encoding"
 
 [dependencies.cpython]
-version = "0.3"
+version = "0.4"
 default-features = false
 features = ["python27-sys"]
 
 [dependencies.python27-sys]
-version = "0.3"
+version = "0.4"