diff --git a/check.sh b/check.sh
index d6efb8749..6c3aac388 100755
--- a/check.sh
+++ b/check.sh
@@ -112,7 +112,7 @@ if [ $EXIT_STATUS -ne 0 ]; then
 Problems were found by static analysis (listed above).
 To fix formatting and see remaining errors, run
 
-    pip install -r test-requirements.txt
+    uv pip install -r test-requirements.txt
     black src/trio
     ruff check src/trio
     ./check.sh
diff --git a/ci.sh b/ci.sh
index 1134b5745..ef3dee55c 100755
--- a/ci.sh
+++ b/ci.sh
@@ -37,25 +37,29 @@ python -c "import sys, struct, ssl; print('python:', sys.version); print('versio
 echo "::endgroup::"
 
 echo "::group::Install dependencies"
-python -m pip install -U pip build
+python -m pip install -U pip uv -c test-requirements.txt
 python -m pip --version
+python -m uv --version
+
+python -m uv pip install build
 
 python -m build
-python -m pip install dist/*.whl -c test-requirements.txt
+wheel_package=$(ls dist/*.whl)
+python -m uv pip install "trio @ $wheel_package" -c test-requirements.txt
 
 if [ "$CHECK_FORMATTING" = "1" ]; then
-    python -m pip install -r test-requirements.txt exceptiongroup
+    python -m uv pip install -r test-requirements.txt exceptiongroup
     echo "::endgroup::"
     source check.sh
 else
     # Actual tests
     # expands to 0 != 1 if NO_TEST_REQUIREMENTS is not set, if set the `-0` has no effect
     # https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02
-    if [ ${NO_TEST_REQUIREMENTS-0} == 1 ]; then
-        python -m pip install pytest coverage -c test-requirements.txt
+    if [ "${NO_TEST_REQUIREMENTS-0}" == 1 ]; then
+        python -m uv pip install pytest coverage -c test-requirements.txt
         flags="--skip-optional-imports"
     else
-        python -m pip install -r test-requirements.txt
+        python -m uv pip install -r test-requirements.txt
         flags=""
     fi
 
@@ -118,7 +122,7 @@ else
     cd empty
 
     INSTALLDIR=$(python -c "import os, trio; print(os.path.dirname(trio.__file__))")
-    cp ../pyproject.toml $INSTALLDIR
+    cp ../pyproject.toml "$INSTALLDIR"
 
     # get mypy tests a nice cache
     MYPYPATH=".." mypy --config-file= --cache-dir=./.mypy_cache -c "import trio" >/dev/null 2>/dev/null || true
@@ -128,7 +132,7 @@ else
 
     echo "::endgroup::"
     echo "::group:: Run Tests"
-    if COVERAGE_PROCESS_START=$(pwd)/../pyproject.toml coverage run --rcfile=../pyproject.toml -m pytest -ra --junitxml=../test-results.xml --run-slow ${INSTALLDIR} --verbose --durations=10 $flags; then
+    if COVERAGE_PROCESS_START=$(pwd)/../pyproject.toml coverage run --rcfile=../pyproject.toml -m pytest -ra --junitxml=../test-results.xml --run-slow "${INSTALLDIR}" --verbose --durations=10 $flags; then
         PASSED=true
     else
         PASSED=false