diff --git a/.github/workflows/ty-ecosystem-report.yaml b/.github/workflows/ty-ecosystem-report.yaml
index ea24b547b5..2df9640229 100644
--- a/.github/workflows/ty-ecosystem-report.yaml
+++ b/.github/workflows/ty-ecosystem-report.yaml
@@ -49,7 +49,7 @@ jobs:
 
           cd ..
 
-          uv tool install "git+https://github.com/astral-sh/ecosystem-analyzer@27dd66d9e397d986ef9c631119ee09556eab8af9"
+          uv tool install "git+https://github.com/astral-sh/ecosystem-analyzer@fc0f612798710b0dd69bb7528bc9b361dc60bd43"
 
           ecosystem-analyzer \
             --verbose \
diff --git a/crates/ty/docs/mypy_primer.md b/crates/ty/docs/mypy_primer.md
index 26cc17c238..7e247ea9e0 100644
--- a/crates/ty/docs/mypy_primer.md
+++ b/crates/ty/docs/mypy_primer.md
@@ -31,7 +31,13 @@ mypy_primer \
 ```
 
 This will show the diagnostics diff for the `black` project between the `main` branch and your `my/feature` branch. To run the
-diff for all projects we currently enable in CI, use `--project-selector "/($(paste -s -d'|' crates/ty_python_semantic/resources/primer/good.txt))\$"`.
+diff for all projects we currently enable in CI, run
+
+```sh
+SELECTOR="$(paste -s -d'|' "crates/ty_python_semantic/resources/primer/good.txt" | sed -e 's@(@\\(@g' -e 's@)@\\)@g')"
+```
+
+and then use `--project-selector "$SELECTOR"`.
 
 You can also take a look at the [full list of ecosystem projects]. Note that some of them might still need a `ty_paths` configuration
 option to work correctly.
diff --git a/crates/ty_python_semantic/resources/primer/good.txt b/crates/ty_python_semantic/resources/primer/good.txt
index aa5fbdfe60..488c6c2830 100644
--- a/crates/ty_python_semantic/resources/primer/good.txt
+++ b/crates/ty_python_semantic/resources/primer/good.txt
@@ -33,7 +33,9 @@ colour
 com2ann
 comtypes
 core
-cpython
+CPython (Argument Clinic)
+CPython (cases_generator)
+CPython (peg_generator)
 cwltool
 dacite
 dd-trace-py
diff --git a/scripts/mypy_primer.sh b/scripts/mypy_primer.sh
index 84c4153c61..5ab96e648c 100755
--- a/scripts/mypy_primer.sh
+++ b/scripts/mypy_primer.sh
@@ -5,7 +5,9 @@ echo "Enabling mypy primer specific configuration overloads (see .github/mypy-pr
 mkdir -p ~/.config/ty
 cp .github/mypy-primer-ty.toml ~/.config/ty/ty.toml
 
-PRIMER_SELECTOR="$(paste -s -d'|' "${PRIMER_SELECTOR}")"
+# Join the lines (project names) of the file into a large regex
+# using `|` and escape parentheses.
+PRIMER_SELECTOR="$(paste -s -d'|' "${PRIMER_SELECTOR}" | sed -e 's@(@\\(@g' -e 's@)@\\)@g')"
 
 echo "new commit"
 git rev-list --format=%s --max-count=1 "${GITHUB_SHA}"