diff --git a/pyproject.toml b/pyproject.toml
index 39609c60ed..f5965623a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ dependencies = [
   "backports-zstd; python_version < '3.14'", # for python < 3.14.
   "jsonargparse>=4.47.0",
   "PyYAML>=6.0.2",  # we need to register our types with yaml, jsonargparse uses yaml for config files
-  "blake3>=1.0.0",
+  "blake3>=1.0.0,!=1.0.9",  # 1.0.9 does not build on windows/msys2/mingw
 ]
 
 [project.optional-dependencies]
@@ -80,15 +80,16 @@ where = ["src"]
 "*" = ["*.c", "*.h", "*.pyx"]
 
 [build-system]
-requires = ["setuptools>=78.1.1", "wheel", "pkgconfig", "Cython>=3.0.3", "setuptools_scm[toml]>=6.2"]
+requires = ["setuptools>=78.1.1", "wheel", "pkgconfig", "Cython>=3.0.3", "setuptools-scm[toml]"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]
-# Make sure we have the same versioning scheme with all setuptools_scm versions, to avoid different autogenerated files.
+# Make sure we have the same versioning scheme with all setuptools-scm versions, to avoid different autogenerated files.
 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1015052
 # https://github.com/borgbackup/borg/issues/6875
 write_to = "src/borg/_version.py"
 write_to_template = "__version__ = version = {version!r}\n"
+tag.strict = false
 
 [tool.black]
 line-length = 120
@@ -172,7 +173,7 @@ module = [
 ignore_missing_imports = true
 
 [tool.tox]
-requires = ["tox>=4.19", "pkgconfig", "cython", "wheel", "setuptools_scm"]
+requires = ["tox>=4.19", "pkgconfig", "cython", "wheel", "setuptools-scm[toml]"]
 # Important: when adding/removing Python versions here,
 #            also update the section "Test environments with different FUSE implementations" accordingly.
 env_list = ["py{311,312,313,314,315}-{none,llfuse,pyfuse3,mfusepy}", "docs", "ruff", "mypy", "bandit"]
diff --git a/requirements.d/development.lock.txt b/requirements.d/development.lock.txt
index d1f00ff312..084a95e67b 100644
--- a/requirements.d/development.lock.txt
+++ b/requirements.d/development.lock.txt
@@ -1,16 +1,11 @@
-setuptools==82.0.1
-setuptools-scm==9.2.2
 pip==26.1.2
-wheel==0.47.0
 virtualenv==21.3.3
 build==1.5.0
-pkgconfig==1.6.0
 tox==4.54.0
 pytest==9.0.3
 pytest-xdist==3.8.0
 coverage[toml]==7.14.3
 pytest-cov==7.1.0
 pytest-benchmark==5.2.3
-Cython==3.2.5
 pre-commit==4.6.0
 types-PyYAML==6.0.12.20260518
diff --git a/requirements.d/development.txt b/requirements.d/development.txt
index d46a28e42d..989bc24339 100644
--- a/requirements.d/development.txt
+++ b/requirements.d/development.txt
@@ -1,17 +1,12 @@
-setuptools >=82.0.1
-setuptools_scm
 pip !=24.2
-wheel
 virtualenv
 build
-pkgconfig
 tox
 pytest
 pytest-xdist
 coverage[toml]
 pytest-cov
 pytest-benchmark
-Cython
 pre-commit
 bandit[toml]
 types-PyYAML