diff --git a/.github/workflows/cache.yml b/.github/workflows/cache.yml
index d7d4f35a..8b225720 100644
--- a/.github/workflows/cache.yml
+++ b/.github/workflows/cache.yml
@@ -20,22 +20,29 @@ jobs:
           environment-file: environment.yml
           activate-environment: quantecon
       - name: graphviz Support # TODO: required?
+        timeout-minutes: 10
         run: |
-          sudo apt-get -qq update && sudo apt-get install -y graphviz
+          # Retried with per-command timeouts (timeout inside sudo, so the kill reaches
+          # apt-get and the dpkg lock is released): a stalled Ubuntu mirror otherwise
+          # hangs this step for hours (two 358-minute hangs on 2026-08-18).
+          pkgs="graphviz"
+          for attempt in 1 2; do
+            sudo timeout -k 30s 1m apt-get -qq update && sudo timeout -k 30s 3m apt-get install -y $pkgs && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
+            echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
+          done
       - name: Install latex dependencies
+        timeout-minutes: 30
         run: |
-          sudo apt-get -qq update
-          sudo apt-get install -y     \
-            texlive-latex-recommended \
-            texlive-latex-extra       \
-            texlive-fonts-recommended \
-            texlive-fonts-extra       \
-            texlive-xetex             \
-            latexmk                   \
-            xindy                     \
-            dvipng                    \
-            cm-super                  \
-            latex-cjk-all
+          # Retried with per-command timeouts (timeout inside sudo, so the kill reaches
+          # apt-get and the dpkg lock is released): a stalled Ubuntu mirror otherwise
+          # hangs this step for hours (two 358-minute hangs on 2026-08-18).
+          pkgs="texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra texlive-xetex latexmk xindy dvipng cm-super latex-cjk-all"
+          for attempt in 1 2; do
+            sudo timeout -k 30s 2m apt-get -qq update && sudo timeout -k 30s 12m apt-get install -y $pkgs && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
+            echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
+          done
       - name: Build HTML
         shell: bash -l {0}
         run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e6d2481b..7d3697cb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,22 +18,29 @@ jobs:
           environment-file: environment.yml
           activate-environment: quantecon
       - name: Graphics Support #TODO: Review if graphviz is needed
+        timeout-minutes: 10
         run: |
-          sudo apt-get -qq update && sudo apt-get install -y graphviz
+          # Retried with per-command timeouts (timeout inside sudo, so the kill reaches
+          # apt-get and the dpkg lock is released): a stalled Ubuntu mirror otherwise
+          # hangs this step for hours (two 358-minute hangs on 2026-08-18).
+          pkgs="graphviz"
+          for attempt in 1 2; do
+            sudo timeout -k 30s 1m apt-get -qq update && sudo timeout -k 30s 3m apt-get install -y $pkgs && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
+            echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
+          done
       - name: Install latex dependencies
+        timeout-minutes: 30
         run: |
-          sudo apt-get -qq update
-          sudo apt-get install -y     \
-            texlive-latex-recommended \
-            texlive-latex-extra       \
-            texlive-fonts-recommended \
-            texlive-fonts-extra       \
-            texlive-xetex             \
-            latexmk                   \
-            xindy                     \
-            dvipng                    \
-            cm-super                  \
-            latex-cjk-all
+          # Retried with per-command timeouts (timeout inside sudo, so the kill reaches
+          # apt-get and the dpkg lock is released): a stalled Ubuntu mirror otherwise
+          # hangs this step for hours (two 358-minute hangs on 2026-08-18).
+          pkgs="texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra texlive-xetex latexmk xindy dvipng cm-super latex-cjk-all"
+          for attempt in 1 2; do
+            sudo timeout -k 30s 2m apt-get -qq update && sudo timeout -k 30s 12m apt-get install -y $pkgs && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
+            echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
+          done
       - name: Display Conda Environment Versions
         shell: bash -l {0}
         run: conda list
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 5685ef15..2956eb93 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -22,18 +22,17 @@ jobs:
           environment-file: environment.yml
           activate-environment: quantecon
       - name: Install latex dependencies
+        timeout-minutes: 30
         run: |
-          sudo apt-get -qq update
-          sudo apt-get install -y     \
-            texlive-latex-recommended \
-            texlive-latex-extra       \
-            texlive-fonts-recommended \
-            texlive-fonts-extra       \
-            texlive-xetex             \
-            latexmk                   \
-            xindy                     \
-            dvipng                    \
-            cm-super
+          # Retried with per-command timeouts (timeout inside sudo, so the kill reaches
+          # apt-get and the dpkg lock is released): a stalled Ubuntu mirror otherwise
+          # hangs this step for hours (two 358-minute hangs on 2026-08-18).
+          pkgs="texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra texlive-xetex latexmk xindy dvipng cm-super"
+          for attempt in 1 2; do
+            sudo timeout -k 30s 2m apt-get -qq update && sudo timeout -k 30s 12m apt-get install -y $pkgs && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
+            echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
+          done
       - name: Display Conda Environment Versions
         shell: bash -l {0}
         run: conda list