diff --git a/.github/workflows/ci_coverage.yml b/.github/workflows/ci_coverage.yml
index 293ad92..1e8602c 100644
--- a/.github/workflows/ci_coverage.yml
+++ b/.github/workflows/ci_coverage.yml
@@ -45,8 +45,8 @@ jobs:
         run: |
           mkdir -p build && cd build
           cmake .. -DCMAKE_BUILD_TYPE=Debug \
-                   -DCMAKE_CXX_FLAGS="--coverage -fprofile-arcs -ftest-coverage -fprofile-abs-path -Werror" \
-                   -DCMAKE_C_FLAGS="--coverage -fprofile-arcs -ftest-coverage -fprofile-abs-path -Werror" \
+                   -DCMAKE_CXX_FLAGS="--coverage -fprofile-arcs -ftest-coverage -fprofile-abs-path" \
+                   -DCMAKE_C_FLAGS="--coverage -fprofile-arcs -ftest-coverage -fprofile-abs-path" \
                    -DCMAKE_EXE_LINKER_FLAGS="-Wl,-lgcov" \
                    -DCMAKE_SHARED_LINKER_FLAGS="-Wl,-lgcov"
 
diff --git a/.github/workflows/ci_linux.yml b/.github/workflows/ci_linux.yml
index 72dcf4d..00fe302 100644
--- a/.github/workflows/ci_linux.yml
+++ b/.github/workflows/ci_linux.yml
@@ -50,7 +50,7 @@ jobs:
         run: |
           mkdir -p build && cd build
           cmake .. -DCMAKE_BUILD_TYPE=Release \
-                   -DCMAKE_CXX_FLAGS="${{ matrix.cxx_flags }} -Werror"
+                   -DCMAKE_CXX_FLAGS="${{ matrix.cxx_flags }}"
 
       - name: Build and run tests
         working-directory: build
diff --git a/.github/workflows/ci_macos.yml b/.github/workflows/ci_macos.yml
index dd2e73a..7012b28 100644
--- a/.github/workflows/ci_macos.yml
+++ b/.github/workflows/ci_macos.yml
@@ -42,8 +42,7 @@ jobs:
       - name: Configure tests
         run: |
           mkdir -p build && cd build
-          cmake .. -DCMAKE_BUILD_TYPE=Release \
-                   -DCMAKE_CXX_FLAGS="-Werror"
+          cmake .. -DCMAKE_BUILD_TYPE=Release
 
       - name: Build and run tests
         working-directory: build
diff --git a/cmake/package-lock.cmake b/cmake/package-lock.cmake
index 0155c25..a3b0ab6 100644
--- a/cmake/package-lock.cmake
+++ b/cmake/package-lock.cmake
@@ -30,10 +30,11 @@ CPMDeclarePackage (sharg
 )
 
 # seqan3
-set (SEQAN3_VERSION 8724133817fc7889b280253c209aa47f6395a13c CACHE STRING "")
+set (SEQAN3_VERSION 3.4.0 CACHE STRING "")
 CPMDeclarePackage (seqan3
                    NAME seqan3
-                   GIT_TAG ${SEQAN3_VERSION} # main
+                   VERSION ${SEQAN3_VERSION}
+                   GIT_TAG ${SEQAN3_VERSION}
                    GITHUB_REPOSITORY seqan/seqan3
                    SYSTEM TRUE
                    EXCLUDE_FROM_ALL TRUE
@@ -41,11 +42,10 @@ CPMDeclarePackage (seqan3
 )
 
 # fmt
-set (FMT_VERSION 11.2.0 CACHE STRING "")
+set (FMT_VERSION 9908d00037d58233bcb1a7c99153bb96363994df CACHE STRING "")
 CPMDeclarePackage (fmt
                    NAME fmt
-                   VERSION ${FMT_VERSION}
-                   GIT_TAG ${FMT_VERSION}
+                   GIT_TAG ${FMT_VERSION} # master
                    GITHUB_REPOSITORY fmtlib/fmt
                    SYSTEM TRUE
                    EXCLUDE_FROM_ALL TRUE