diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5781605..7b4f763 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -217,11 +217,27 @@ jobs:
 
       - name: Download GMP Archive
         if: steps.cache-gmp.outputs.cache-hit != 'true'
-        working-directory: rapidsnark/depends
+        shell: bash
         run: |
-          echo "Downloading GMP archive..."
-          curl -L -o gmp-6.2.1.tar.xz https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz
-          echo "Download complete."
+          set -euo pipefail
+          mkdir -p rapidsnark/depends
+          cd rapidsnark/depends
+          URLS=(
+            "https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz"
+            "https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz"
+            "https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz"
+          )
+          for url in "${URLS[@]}"; do
+            echo "Trying $url"
+            if curl --fail --location --retry 5 --retry-delay 3 --retry-all-errors \
+              --connect-timeout 20 --max-time 300 \
+              -o gmp-6.2.1.tar.xz "$url"; then
+              echo "Download complete from $url"
+              exit 0
+            fi
+          done
+          echo "All GMP download sources failed"
+          exit 1
 
       - name: Compile Prover and Verifier
         working-directory: rapidsnark
@@ -470,11 +486,27 @@ jobs:
 
       - name: Download GMP Archive
         if: steps.cache-gmp.outputs.cache-hit != 'true'
-        working-directory: rapidsnark/depends
+        shell: bash
         run: |
-          echo "Downloading GMP archive..."
-          curl -L -o gmp-6.2.1.tar.xz https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz
-          echo "Download complete."
+          set -euo pipefail
+          mkdir -p rapidsnark/depends
+          cd rapidsnark/depends
+          URLS=(
+            "https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz"
+            "https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz"
+            "https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz"
+          )
+          for url in "${URLS[@]}"; do
+            echo "Trying $url"
+            if curl --fail --location --retry 5 --retry-delay 3 --retry-all-errors \
+              --connect-timeout 20 --max-time 300 \
+              -o gmp-6.2.1.tar.xz "$url"; then
+              echo "Download complete from $url"
+              exit 0
+            fi
+          done
+          echo "All GMP download sources failed"
+          exit 1
 
       - name: Compile Prover and Verifier
         working-directory: rapidsnark
@@ -761,12 +793,27 @@ jobs:
 
       - name: Download GMP Archive
         if: steps.cache-gmp.outputs.cache-hit != 'true'
-        shell: msys2 {0}
-        working-directory: rapidsnark/depends
+        shell: bash
         run: |
-          echo "Downloading GMP archive..."
-          curl -L -o gmp-6.2.1.tar.xz https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz
-          echo "Download complete."
+          set -euo pipefail
+          mkdir -p rapidsnark/depends
+          cd rapidsnark/depends
+          URLS=(
+            "https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz"
+            "https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz"
+            "https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz"
+          )
+          for url in "${URLS[@]}"; do
+            echo "Trying $url"
+            if curl --fail --location --retry 5 --retry-delay 3 --retry-all-errors \
+              --connect-timeout 20 --max-time 300 \
+              -o gmp-6.2.1.tar.xz "$url"; then
+              echo "Download complete from $url"
+              exit 0
+            fi
+          done
+          echo "All GMP download sources failed"
+          exit 1
 
       - name: Compile Prover and Verifier
         shell: msys2 {0}
@@ -1015,11 +1062,27 @@ jobs:
 
       - name: Download GMP Archive
         if: steps.cache-gmp.outputs.cache-hit != 'true'
-        working-directory: rapidsnark/depends
+        shell: bash
         run: |
-          echo "Downloading GMP archive..."
-          curl -L -o gmp-6.2.1.tar.xz https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz
-          echo "Download complete."
+          set -euo pipefail
+          mkdir -p rapidsnark/depends
+          cd rapidsnark/depends
+          URLS=(
+            "https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz"
+            "https://gmplib.org/download/gmp/gmp-6.2.1.tar.xz"
+            "https://ftpmirror.gnu.org/gmp/gmp-6.2.1.tar.xz"
+          )
+          for url in "${URLS[@]}"; do
+            echo "Trying $url"
+            if curl --fail --location --retry 5 --retry-delay 3 --retry-all-errors \
+              --connect-timeout 20 --max-time 300 \
+              -o gmp-6.2.1.tar.xz "$url"; then
+              echo "Download complete from $url"
+              exit 0
+            fi
+          done
+          echo "All GMP download sources failed"
+          exit 1
 
       - name: Compile Prover and Verifier
         working-directory: rapidsnark
@@ -1028,6 +1091,7 @@ jobs:
           # MACOSX_DEPLOYMENT_TARGET. Patch it to 11.0 so libgmp.a matches Rust's
           # aarch64-apple-darwin toolchain target (macOS 11.0+).
           sed -i '' 's/-mmacos-version-min=14\.0/-mmacos-version-min=11.0/g' build_gmp.sh
+          sed -i '' 's/ -arch arm64e//g' build_gmp.sh
           ./build_gmp.sh macos_arm64
           make macos_arm64