diff --git a/.ci_support/linux_64_numpy1.18python3.6.____cpython.yaml b/.ci_support/linux_64_numpy1.18python3.6.____cpython.yaml
index 5d6aa9b..1e2f0f8 100644
--- a/.ci_support/linux_64_numpy1.18python3.6.____cpython.yaml
+++ b/.ci_support/linux_64_numpy1.18python3.6.____cpython.yaml
@@ -14,6 +14,8 @@ docker_image:
 - quay.io/condaforge/linux-anvil-comp7
 gmp:
 - '6'
+libflint:
+- '2.8'
 mpfr:
 - '4'
 numpy:
diff --git a/.ci_support/linux_64_numpy1.18python3.7.____cpython.yaml b/.ci_support/linux_64_numpy1.18python3.7.____cpython.yaml
index 6f7bdfc..88a1df9 100644
--- a/.ci_support/linux_64_numpy1.18python3.7.____cpython.yaml
+++ b/.ci_support/linux_64_numpy1.18python3.7.____cpython.yaml
@@ -14,6 +14,8 @@ docker_image:
 - quay.io/condaforge/linux-anvil-comp7
 gmp:
 - '6'
+libflint:
+- '2.8'
 mpfr:
 - '4'
 numpy:
diff --git a/.ci_support/linux_64_numpy1.18python3.8.____cpython.yaml b/.ci_support/linux_64_numpy1.18python3.8.____cpython.yaml
index 3bfb6e7..f170535 100644
--- a/.ci_support/linux_64_numpy1.18python3.8.____cpython.yaml
+++ b/.ci_support/linux_64_numpy1.18python3.8.____cpython.yaml
@@ -14,6 +14,8 @@ docker_image:
 - quay.io/condaforge/linux-anvil-comp7
 gmp:
 - '6'
+libflint:
+- '2.8'
 mpfr:
 - '4'
 numpy:
diff --git a/.ci_support/linux_64_numpy1.19python3.7.____73_pypy.yaml b/.ci_support/linux_64_numpy1.19python3.7.____73_pypy.yaml
index c65cb9e..9943c14 100644
--- a/.ci_support/linux_64_numpy1.19python3.7.____73_pypy.yaml
+++ b/.ci_support/linux_64_numpy1.19python3.7.____73_pypy.yaml
@@ -14,6 +14,8 @@ docker_image:
 - quay.io/condaforge/linux-anvil-comp7
 gmp:
 - '6'
+libflint:
+- '2.8'
 mpfr:
 - '4'
 numpy:
diff --git a/.ci_support/linux_64_numpy1.19python3.9.____cpython.yaml b/.ci_support/linux_64_numpy1.19python3.9.____cpython.yaml
index 18e2753..66d2928 100644
--- a/.ci_support/linux_64_numpy1.19python3.9.____cpython.yaml
+++ b/.ci_support/linux_64_numpy1.19python3.9.____cpython.yaml
@@ -14,6 +14,8 @@ docker_image:
 - quay.io/condaforge/linux-anvil-comp7
 gmp:
 - '6'
+libflint:
+- '2.8'
 mpfr:
 - '4'
 numpy:
diff --git a/.ci_support/migrations/libflint28.yaml b/.ci_support/migrations/libflint28.yaml
new file mode 100644
index 0000000..85ef3e5
--- /dev/null
+++ b/.ci_support/migrations/libflint28.yaml
@@ -0,0 +1,8 @@
+__migrator:
+  build_number: 1
+  kind: version
+  migration_number: 1
+  check_solvable: false
+libflint:
+- '2.8'
+migrator_ts: 1627326414
diff --git a/.ci_support/osx_64_numpy1.18python3.6.____cpython.yaml b/.ci_support/osx_64_numpy1.18python3.6.____cpython.yaml
index 67483a8..b334302 100644
--- a/.ci_support/osx_64_numpy1.18python3.6.____cpython.yaml
+++ b/.ci_support/osx_64_numpy1.18python3.6.____cpython.yaml
@@ -12,6 +12,8 @@ channel_targets:
 - conda-forge main
 gmp:
 - '6'
+libflint:
+- '2.8'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 mpfr:
diff --git a/.ci_support/osx_64_numpy1.18python3.7.____cpython.yaml b/.ci_support/osx_64_numpy1.18python3.7.____cpython.yaml
index 632e5cd..cee3f1b 100644
--- a/.ci_support/osx_64_numpy1.18python3.7.____cpython.yaml
+++ b/.ci_support/osx_64_numpy1.18python3.7.____cpython.yaml
@@ -12,6 +12,8 @@ channel_targets:
 - conda-forge main
 gmp:
 - '6'
+libflint:
+- '2.8'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 mpfr:
diff --git a/.ci_support/osx_64_numpy1.18python3.8.____cpython.yaml b/.ci_support/osx_64_numpy1.18python3.8.____cpython.yaml
index 8ee9cb8..25cd063 100644
--- a/.ci_support/osx_64_numpy1.18python3.8.____cpython.yaml
+++ b/.ci_support/osx_64_numpy1.18python3.8.____cpython.yaml
@@ -12,6 +12,8 @@ channel_targets:
 - conda-forge main
 gmp:
 - '6'
+libflint:
+- '2.8'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 mpfr:
diff --git a/.ci_support/osx_64_numpy1.19python3.7.____73_pypy.yaml b/.ci_support/osx_64_numpy1.19python3.7.____73_pypy.yaml
index 4920220..71ed802 100644
--- a/.ci_support/osx_64_numpy1.19python3.7.____73_pypy.yaml
+++ b/.ci_support/osx_64_numpy1.19python3.7.____73_pypy.yaml
@@ -12,6 +12,8 @@ channel_targets:
 - conda-forge main
 gmp:
 - '6'
+libflint:
+- '2.8'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 mpfr:
diff --git a/.ci_support/osx_64_numpy1.19python3.9.____cpython.yaml b/.ci_support/osx_64_numpy1.19python3.9.____cpython.yaml
index 4e35def..0bc4df6 100644
--- a/.ci_support/osx_64_numpy1.19python3.9.____cpython.yaml
+++ b/.ci_support/osx_64_numpy1.19python3.9.____cpython.yaml
@@ -12,6 +12,8 @@ channel_targets:
 - conda-forge main
 gmp:
 - '6'
+libflint:
+- '2.8'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 mpfr: