diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 06d69ccc..909a53f5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -180,17 +180,21 @@ jobs:
       with:
         fetch-depth: 1
     - name: Install dependencies
-      run: brew install autoconf automake fltk
+      run: brew install autoconf automake fltk@1.3
     - name: autogen
       run: ./autogen.sh
     - name: configure
-      run: ./configure --disable-mbedtls
+      run: |
+        export PATH="/usr/local/opt/fltk@1.3/bin:$PATH"
+        ./configure --disable-mbedtls
     - name: make
       run: make
     - name: make check
       run: make check
     - name: make distcheck
-      run: make distcheck
+      run: |
+        export PATH="/usr/local/opt/fltk@1.3/bin:$PATH"
+        make distcheck
   macOS-13-openssl-3:
     needs: ubuntu-latest-html-tests
     runs-on: macos-13
@@ -201,17 +205,21 @@ jobs:
     - name: Remove old OpenSSL 1.1
       run: brew uninstall openssl@1.1
     - name: Install dependencies
-      run: brew install autoconf automake fltk openssl@3
+      run: brew install autoconf automake fltk@1.3 openssl@3
     - name: autogen
       run: ./autogen.sh
     - name: configure
-      run: ./configure --disable-mbedtls
+      run: |
+        export PATH="/usr/local/opt/fltk@1.3/bin:$PATH"
+        ./configure --disable-mbedtls
     - name: make
       run: make
     - name: make check
       run: make check
     - name: make distcheck
-      run: make distcheck
+      run: |
+        export PATH="/usr/local/opt/fltk@1.3/bin:$PATH"
+        make distcheck
   freebsd-14-openssl-3:
     needs: ubuntu-latest-html-tests
     runs-on: ubuntu-latest
diff --git a/doc/install.md b/doc/install.md
index a80577f3..7a0250eb 100644
--- a/doc/install.md
+++ b/doc/install.md
@@ -144,7 +144,7 @@ autoconf and automake if you are building Dillo from the git repository.
 They are available in the Homebrew package manager:
 
 ```
-$ brew install autoconf automake fltk
+$ brew install autoconf automake fltk@1.3
 ```
 
 For OpenSSL you can use either 1.1 or 3.X (recommended):