diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index be90511..a9f1a32 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -55,7 +55,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           persist-credentials: false
-      - uses: r-lib/actions/setup-tinytex@6f6e5bc62fba3a704f74e7ad7ef7676c5c6a2590 # v2
+      - uses: r-lib/actions/setup-tinytex@a51a8012b0aab7c32ef9d19bf54da93f3254335e # v2
         if: runner.os != 'Windows'
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
         with:
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
index fb5a933..7229e34 100644
--- a/.github/workflows/zizmor.yml
+++ b/.github/workflows/zizmor.yml
@@ -43,6 +43,6 @@ jobs:
           always() &&
           (github.event_name != 'pull_request' ||
           github.event.pull_request.head.repo.full_name == github.repository)
-        uses: github/codeql-action/upload-sarif@95e58e9a2cdfd71adc6e0353d5c52f41a045d225 # v4
+        uses: github/codeql-action/upload-sarif@e46ed2cbd01164d986452f91f178727624ae40d7 # v4
         with:
           sarif_file: zizmor.sarif
diff --git a/src/pytask_latex/collect.py b/src/pytask_latex/collect.py
index 927f249..a0ec8e9 100644
--- a/src/pytask_latex/collect.py
+++ b/src/pytask_latex/collect.py
@@ -228,7 +228,7 @@ def pytask_collect_modify_tasks(session: Session, tasks: list[PTask]) -> None:
         all_products = {
             product.path
             for task in tasks
-            for product in tree_leaves(task.produces)
+            for product in tree_leaves(task.produces)  # ty: ignore[invalid-argument-type]
             if isinstance(product, PPathNode)
         }
         latex_tasks = [task for task in tasks if has_mark(task, "latex")]
@@ -262,7 +262,7 @@ def _add_latex_dependencies_retroactively(
     try:
         path_to_tex = task.depends_on["_path_to_tex"]
         scanned_deps = (
-            set(lds.scan(path_to_tex.path))
+            set(lds.scan(path_to_tex.path))  # ty: ignore[invalid-argument-type]
             if isinstance(path_to_tex, PPathNode)
             else set()
         )
@@ -275,7 +275,9 @@ def _add_latex_dependencies_retroactively(
     # Remove duplicated dependencies which have already been added by the user and those
     # which do not exist.
     task_deps = {
-        i.path for i in tree_leaves(task.depends_on) if isinstance(i, PPathNode)
+        i.path
+        for i in tree_leaves(task.depends_on)  # ty: ignore[invalid-argument-type]
+        if isinstance(i, PPathNode)
     }
     additional_deps = scanned_deps - task_deps
     new_deps = [i for i in additional_deps if i in all_products or i.exists()]
@@ -296,7 +298,7 @@ def _add_latex_dependencies_retroactively(
                 task_name=task.name,
             ),
         ),
-        new_deps,
+        new_deps,  # ty: ignore[invalid-argument-type]
     )
     task.depends_on["_scanned_dependencies"] = collected_dependencies