JuliaPy · cjdoris · Oct 16, 2025 · Oct 16, 2025 · Oct 16, 2025 · Oct 16, 2025
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
@@ -19,7 +19,7 @@ jobs:
       matrix:
         arch: [x64] # x86 unsupported by MicroMamba
         os: [ubuntu-latest, windows-latest, macos-latest]
-        jlversion: ['1','1.9']
+        jlversion: ['1','1.10']
         pythonexe: ['@CondaPkg']
         include:
         - arch: x64
@@ -66,7 +66,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        pyversion: ["3", "3.9"]
+        pyversion: ["3", "3.10"]
         juliaexe: ["@JuliaPkg"]
         include:
         - os: ubuntu-latest

diff --git a/CondaPkg.toml b/CondaPkg.toml
@@ -10,7 +10,7 @@ version = "<=julia"
 
 [deps.python]
 build = "**cpython**"
-version = ">=3.9,<4"
+version = ">=3.10,<4"
 
 [dev.deps]
 matplotlib = ""

diff --git a/Project.toml b/Project.toml
@@ -29,7 +29,7 @@ Tables = "1"
 Test = "1"
 TestItemRunner = "0 - 999"
 UnsafePointers = "1"
-julia = "1.9"
+julia = "1.10"
 
 [extensions]
 PyCallExt = "PyCall"

diff --git a/README.md b/README.md
@@ -14,7 +14,7 @@ Bringing [**Python®**](https://www.python.org/) and [**Julia**](https://juliala
 - Fast non-copying conversion of numeric arrays in either direction: modify Python arrays (e.g. `bytes`, `array.array`, `numpy.ndarray`) from Julia or Julia arrays from Python.
 - Helpful wrappers: interpret Python sequences, dictionaries, arrays, dataframes and IO streams as their Julia counterparts, and vice versa.
 - Beautiful stack-traces.
-- Supports modern systems: tested on Windows, MacOS and Linux, 64-bit, Julia 1.9 upwards and Python 3.9 upwards.
+- Supports modern systems: tested on Windows, MacOS and Linux, 64-bit, Julia 1.10 upwards and Python 3.10 upwards.
 
 ⭐ If you like this, a GitHub star would be lovely thank you. ⭐
 

diff --git a/docs/src/faq.md b/docs/src/faq.md
@@ -108,3 +108,11 @@ using PythonCall
 
 np = pyimport("numpy")
 ```
+
+## What versions of Python and Julia do you support?
+
+Each release of PythonCall and JuliaCall will support and require:
+- Any currently supported version of Python, [see here](https://devguide.python.org/versions/). Currently 3.10+.
+- The current Julia LTS version and newer, [see here](https://julialang.org/downloads/#long_term_support_release). Currently 1.10+.
+
+Only the latest patch release within each minor version is supported.
diff --git a/docs/src/index.md b/docs/src/index.md
@@ -7,4 +7,4 @@ Bringing [**Python®**](https://www.python.org/) and [**Julia**](https://juliala
 - Fast non-copying conversion of numeric arrays in either direction: modify Python arrays (e.g. `bytes`, `array.array`, `numpy.ndarray`) from Julia or Julia arrays from Python.
 - Helpful wrappers: interpret Python sequences, dictionaries, arrays, dataframes and IO streams as their Julia counterparts, and vice versa.
 - Beautiful stack-traces.
-- Works anywhere: tested on Windows, MacOS and Linux, 32- and 64-bit, Julia Julia 1.9 upwards and Python 3.9 upwards.
+- Works anywhere: tested on Windows, MacOS and Linux, 32- and 64-bit, Julia Julia 1.10 upwards and Python 3.10 upwards.
diff --git a/docs/src/juliacall.md b/docs/src/juliacall.md
@@ -7,6 +7,11 @@ It's as simple as
 pip install juliacall
 ```
 
+If you prefer Conda, there is a community effort to also release this on conda-forge:
+```bash
+conda install conda-forge::pyjuliapkg
+```
+
 Developers may wish to clone the repo (https://github.com/JuliaPy/PythonCall.jl) directly
 and pip install the module in editable mode. You should add `"dev":true, "path":"../.."` to
 `pysrc/juliacall/juliapkg.json` to ensure you use the development version of PythonCall
@@ -140,6 +145,10 @@ be configured in two ways:
 
 ## [Multi-threading](@id py-multi-threading)
 
+!!! warning
+
+    Multi-threading support is experimental and can change without notice.
+
 From v0.9.22, JuliaCall supports multi-threading in Julia and/or Python, with some
 caveats.
 

diff --git a/docs/src/pythoncall.md b/docs/src/pythoncall.md
@@ -415,6 +415,10 @@ See [Installing Python packages](@ref python-deps).
 
 ## [Multi-threading](@id jl-multi-threading)
 
+!!! warning
+
+    Multi-threading support is experimental and can change without notice.
+
 From v0.9.22, PythonCall supports multi-threading in Julia and/or Python, with some
 caveats.
 

diff --git a/docs/src/releasenotes.md b/docs/src/releasenotes.md
@@ -1,8 +1,11 @@
 # Release Notes
 
 ## Unreleased
+* Minimum supported Python version is now 3.10.
+* Minimum supported Julia version is now 1.10.
 * Showing `Py` now respects the `compact` option - output is limited to a single line of
   at most the display width.
+* Support policy now documented in the FAQ.
 * Bug fixes.
 
 ## 0.9.28 (2025-09-17)

diff --git a/pyproject.toml b/pyproject.toml
@@ -12,7 +12,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
-requires-python = ">=3.9, <4"
+requires-python = ">=3.10, <4"
 dependencies = ["juliapkg >=0.1.21, <0.2"]
 
 [dependency-groups]

diff --git a/pysrc/juliacall/juliapkg-dev.json b/pysrc/juliacall/juliapkg-dev.json
@@ -1,5 +1,5 @@
 {
-    "julia": "~1.9, ^1.10.3",
+    "julia": "^1.10.3",
     "packages": {
         "PythonCall": {
             "uuid": "6099a3de-0909-46bc-b1f4-468b9a2dfc0d",

diff --git a/pysrc/juliacall/juliapkg.json b/pysrc/juliacall/juliapkg.json
@@ -1,5 +1,5 @@
 {
-    "julia": "~1.9, ^1.10.3",
+    "julia": "^1.10.3",
     "packages": {
         "PythonCall": {
             "uuid": "6099a3de-0909-46bc-b1f4-468b9a2dfc0d",

diff --git a/src/C/context.jl b/src/C/context.jl
@@ -236,8 +236,8 @@ function init_context()
         error("Cannot parse version from version string: $(repr(verstr))")
     end
     CTX.version = VersionNumber(vermatch.match)
-    v"3.9" ≤ CTX.version < v"4" || error(
-        "Only Python 3.9+ is supported, this is Python $(CTX.version) at $(CTX.exe_path===missing ? "unknown location" : CTX.exe_path).",
+    v"3.10" ≤ CTX.version < v"4" || error(
+        "Only Python 3.10+ is supported, this is Python $(CTX.version) at $(CTX.exe_path===missing ? "unknown location" : CTX.exe_path).",
     )
 
     @debug "Initialized PythonCall.jl" CTX.is_embedded CTX.is_initialized CTX.exe_path CTX.lib_path CTX.lib_ptr CTX.pyprogname CTX.pyhome CTX.version

diff --git a/src/GIL/GIL.jl b/src/GIL/GIL.jl
@@ -4,6 +4,10 @@
 Handling the Python Global Interpreter Lock.
 
 See [`lock`](@ref), [`@lock`](@ref), [`unlock`](@ref) and [`@unlock`](@ref).
+
+!!! warning
+
+    Multi-threading support is experimental and can change without notice.
 """
 module GIL
 
@@ -32,6 +36,10 @@ threads. Since the main Julia thread holds the GIL by default, you will need to
 [`unlock`](@ref) the GIL before using this function.
 
 See [`@lock`](@ref) for the macro form.
+
+!!! warning
+
+    This function is experimental. Its semantics may be changed without notice.
 """
 function lock(f)
     state = C.PyGILState_Ensure()
@@ -52,6 +60,10 @@ threads. Since the main Julia thread holds the GIL by default, you will need to
 [`@unlock`](@ref) the GIL before using this function.
 
 The macro equivalent of [`lock`](@ref).
+
+!!! warning
+
+    This macro is experimental. Its semantics may be changed without notice.
 """
 macro lock(expr)
     quote
@@ -74,6 +86,10 @@ Python code. That other thread can be a Julia thread, which must lock the GIL us
 [`lock`](@ref).
 
 See [`@unlock`](@ref) for the macro form.
+
+!!! warning
+
+    This function is experimental. Its semantics may be changed without notice.
 """
 function unlock(f)
     state = C.PyEval_SaveThread()
@@ -94,6 +110,10 @@ Python code. That other thread can be a Julia thread, which must lock the GIL us
 [`@lock`](@ref).
 
 The macro equivalent of [`unlock`](@ref).
+
+!!! warning
+
+    This macro is experimental. Its semantics may be changed without notice.
 """
 macro unlock(expr)
     quote