diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6372fd06..ac33269a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,9 +27,9 @@ jobs:
   test:
     name: Test ${{ matrix.rust }} on ${{ matrix.os }}
     # The large timeout is to accommodate:
-    # - Windows builds (75 minutes, typically 30-50 minutes)
-    # - parameter downloads (40 minutes, but only when the cache expires)
-    timeout-minutes: 115
+    # - Windows builds (75 minutes, typically 30-50 minutes), and
+    # - parameter downloads (an extra 90 minutes, but only when the cache expires)
+    timeout-minutes: 165
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 58970287..7b06d42f 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -38,9 +38,9 @@ jobs:
   coverage:
     name: Coverage nightly
     # The large timeout is to accommodate:
-    # - nightly builds (75 minutes, typically 30-50 minutes)
-    # - parameter downloads (40 minutes, but only when the cache expires)
-    timeout-minutes: 115
+    # - nightly builds (75 minutes, typically 30-50 minutes), and
+    # - parameter downloads (an extra 90 minutes, but only when the cache expires)
+    timeout-minutes: 165
     runs-on: ubuntu-latest
 
     steps: