diff --git a/.github/workflows/pixi-packages.yml b/.github/workflows/pixi-packages.yml
index f47a62164d33..25ebed9cc83a 100644
--- a/.github/workflows/pixi-packages.yml
+++ b/.github/workflows/pixi-packages.yml
@@ -36,7 +36,7 @@ jobs:
 
     - uses: prefix-dev/setup-pixi@82d477f15f3a381dbcc8adc1206ce643fe110fb7 # v0.9.3
       with:
-        pixi-version: v0.63.2
+        pixi-version: v0.64.0
         run-install: false
 
     - name: Build
diff --git a/pixi-packages/asan/LICENSE.txt b/pixi-packages/asan/LICENSE.txt
new file mode 100644
index 000000000000..f37a12cc4ccc
--- /dev/null
+++ b/pixi-packages/asan/LICENSE.txt
@@ -0,0 +1,30 @@
+Copyright (c) 2005-2025, NumPy Developers.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials provided
+       with the distribution.
+
+    * Neither the name of the NumPy Developers nor the names of any
+       contributors may be used to endorse or promote products derived
+       from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pixi-packages/asan/pixi.toml b/pixi-packages/asan/pixi.toml
index 55aee3e13843..afe9edc50cba 100644
--- a/pixi-packages/asan/pixi.toml
+++ b/pixi-packages/asan/pixi.toml
@@ -3,6 +3,10 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["linux-64", "linux-aarch64", "osx-arm64"]
 preview = ["pixi-build"]
 
+[package]
+# Work-around to https://github.com/prefix-dev/pixi/issues/5557
+license-file = "LICENSE.txt"
+
 [package.build]
 source.path = "../.."
 
@@ -19,6 +23,7 @@ extra-args = ["-Csetup-args=-Db_sanitize=address", "-Csetup-args=-Dbuildtype=deb
 [package.host-dependencies]
 python.git = "https://github.com/python/cpython"
 python.subdirectory = "Tools/pixi-packages/asan"
+python.rev = "15b216f30d0445469ec31bc7509fcc55a216ef7c"  # v3.15.0a6
 
 meson-python = "*"
 cython = "*"
diff --git a/pixi-packages/default/LICENSE.txt b/pixi-packages/default/LICENSE.txt
new file mode 100644
index 000000000000..f37a12cc4ccc
--- /dev/null
+++ b/pixi-packages/default/LICENSE.txt
@@ -0,0 +1,30 @@
+Copyright (c) 2005-2025, NumPy Developers.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials provided
+       with the distribution.
+
+    * Neither the name of the NumPy Developers nor the names of any
+       contributors may be used to endorse or promote products derived
+       from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pixi-packages/default/pixi.toml b/pixi-packages/default/pixi.toml
index 182e807e2ead..e3e201bece3e 100644
--- a/pixi-packages/default/pixi.toml
+++ b/pixi-packages/default/pixi.toml
@@ -3,6 +3,10 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["linux-64", "linux-aarch64", "osx-arm64"]
 preview = ["pixi-build"]
 
+[package]
+# Work-around to https://github.com/prefix-dev/pixi/issues/5557
+license-file = "LICENSE.txt"
+
 [package.build]
 source.path = "../.."
 
@@ -27,6 +31,7 @@ python = "*"
 # Use cpython git tip
 # python.git = "https://github.com/python/cpython"
 # python.subdirectory = "Tools/pixi-packages/default"
+# python.rev = "15b216f30d0445469ec31bc7509fcc55a216ef7c"  # v3.15.0a6
 
 meson-python = "*"
 cython = "*"
diff --git a/pixi-packages/freethreading/LICENSE.txt b/pixi-packages/freethreading/LICENSE.txt
new file mode 100644
index 000000000000..f37a12cc4ccc
--- /dev/null
+++ b/pixi-packages/freethreading/LICENSE.txt
@@ -0,0 +1,30 @@
+Copyright (c) 2005-2025, NumPy Developers.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials provided
+       with the distribution.
+
+    * Neither the name of the NumPy Developers nor the names of any
+       contributors may be used to endorse or promote products derived
+       from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pixi-packages/freethreading/pixi.toml b/pixi-packages/freethreading/pixi.toml
index f8ba4e015a91..372fcbaa2c48 100644
--- a/pixi-packages/freethreading/pixi.toml
+++ b/pixi-packages/freethreading/pixi.toml
@@ -3,6 +3,10 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["linux-64", "linux-aarch64", "osx-arm64"]
 preview = ["pixi-build"]
 
+[package]
+# Work-around to https://github.com/prefix-dev/pixi/issues/5557
+license-file = "LICENSE.txt"
+
 [package.build]
 source.path = "../.."
 
@@ -27,6 +31,7 @@ python-freethreading = "*"
 # Use cpython git tip
 # python.git = "https://github.com/python/cpython"
 # python.subdirectory = "Tools/pixi-packages/freethreading"
+# python.rev = "15b216f30d0445469ec31bc7509fcc55a216ef7c"  # v3.15.0a6
 
 meson-python = "*"
 cython = "*"
diff --git a/pixi-packages/tsan-freethreading/LICENSE.txt b/pixi-packages/tsan-freethreading/LICENSE.txt
new file mode 100644
index 000000000000..f37a12cc4ccc
--- /dev/null
+++ b/pixi-packages/tsan-freethreading/LICENSE.txt
@@ -0,0 +1,30 @@
+Copyright (c) 2005-2025, NumPy Developers.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials provided
+       with the distribution.
+
+    * Neither the name of the NumPy Developers nor the names of any
+       contributors may be used to endorse or promote products derived
+       from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pixi-packages/tsan-freethreading/pixi.toml b/pixi-packages/tsan-freethreading/pixi.toml
index 1f4ade49069b..8c12c3c7a83e 100644
--- a/pixi-packages/tsan-freethreading/pixi.toml
+++ b/pixi-packages/tsan-freethreading/pixi.toml
@@ -3,6 +3,10 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["linux-64", "linux-aarch64", "osx-arm64"]
 preview = ["pixi-build"]
 
+[package]
+# Work-around to https://github.com/prefix-dev/pixi/issues/5557
+license-file = "LICENSE.txt"
+
 [package.build]
 source.path = "../.."
 
@@ -19,6 +23,7 @@ extra-args = ["-Csetup-args=-Db_sanitize=thread", "-Csetup-args=-Dbuildtype=debu
 [package.host-dependencies]
 python.git = "https://github.com/python/cpython"
 python.subdirectory = "Tools/pixi-packages/tsan-freethreading"
+python.rev = "15b216f30d0445469ec31bc7509fcc55a216ef7c"  # v3.15.0a6
 
 meson-python = "*"
 cython = "*"