diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
new file mode 100644
index 0000000..71b81d2
--- /dev/null
+++ b/.forgejo/workflows/ci.yml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - develop
+
+jobs:
+  test:
+    runs-on: nix
+    steps:
+    - uses: actions/checkout@v3
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --no-default-features"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --features tls-native"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo build --workspace --all-targets --features tls-rust"
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo test --workspace --all-targets"
+    # runs all documentation tests separately, since those are not picked up by
+    # `--all-targets`.
+    - run: nix-shell -p cargo pkg-config openssl --run "cargo test --workspace --doc"
+
+  rustfmt:
+    runs-on: nix
+    steps:
+    - uses: actions/checkout@v3
+    - run: nix-shell -p rustfmt cargo --run "cargo fmt --all --check"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index 0f6290f..0000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,41 +0,0 @@
-name: CI
-
-on:
-  pull_request: {}
-  push:
-    branches:
-      - develop
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        rust: ["1.71", stable]
-    steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@master
-      with:
-        toolchain: ${{matrix.rust}}
-    - run: cargo build --workspace --all-targets
-    - run: cargo build --workspace --all-targets --no-default-features
-    - run: cargo build --workspace --all-targets --features tls-native
-    - run: cargo build --workspace --all-targets --features tls-rust
-    # runs all tests for all targets, including examples and benchmarks. Only on
-    # stable, since we don't care about tests running on MSRV.
-    - run: cargo test --workspace --all-targets
-      if: matrix.rust == 'stable'
-    # runs all documentation tests separately, since those are not picked up by
-    # `--all-targets`.
-    - run: cargo test --workspace --doc
-      if: matrix.rust == 'stable'
-
-  rustfmt:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
-      with:
-        components: rustfmt
-    - run: cargo fmt --all --check