diff --git a/.github/workflows/build-without-conan.yml b/.github/workflows/build-without-conan.yml
index f2723fe233..bccf602a21 100644
--- a/.github/workflows/build-without-conan.yml
+++ b/.github/workflows/build-without-conan.yml
@@ -96,9 +96,9 @@ jobs:
     - name: Install pybind11
       run: |
         cd ${TMP_DIR}
-        wget https://github.com/pybind/pybind11/archive/refs/tags/v2.13.4.tar.gz
-        tar xzvf v2.13.4.tar.gz
-        cd pybind11-2.13.4/
+        wget https://github.com/pybind/pybind11/archive/refs/tags/v2.13.5.tar.gz
+        tar xzvf v2.13.5.tar.gz
+        cd pybind11-2.13.5/
         mkdir build
         cd build
         cmake -GNinja -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR} -DPYBIND11_TEST=OFF ..
diff --git a/build-without-conan.md b/build-without-conan.md
index a3c1bcccaf..2ec42fdef4 100644
--- a/build-without-conan.md
+++ b/build-without-conan.md
@@ -119,9 +119,9 @@ cmake --install .
 
 ```
 cd ${TMP_DIR}
-wget https://github.com/pybind/pybind11/archive/refs/tags/v2.13.4.tar.gz
-tar xzvf v2.13.4.tar.gz
-cd pybind11-2.13.4/
+wget https://github.com/pybind/pybind11/archive/refs/tags/v2.13.5.tar.gz
+tar xzvf v2.13.5.tar.gz
+cd pybind11-2.13.5/
 mkdir build
 cd build
 cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR} -DPYBIND11_TEST=OFF ..
diff --git a/pytket/conanfile.py b/pytket/conanfile.py
index 130191a0dc..18126f363b 100644
--- a/pytket/conanfile.py
+++ b/pytket/conanfile.py
@@ -32,7 +32,7 @@ def package(self):
         cmake.install()
 
     def requirements(self):
-        self.requires("tket/1.3.19@tket/stable")
+        self.requires("tket/1.3.20@tket/stable")
         self.requires("tklog/0.3.3@tket/stable")
         self.requires("tkrng/0.3.3@tket/stable")
         self.requires("tkassert/0.3.4@tket/stable")
@@ -40,6 +40,6 @@ def requirements(self):
         self.requires("tktokenswap/0.3.8@tket/stable")
         self.requires("symengine/0.12.0")
         self.requires("gmp/6.3.0")
-        self.requires("pybind11/2.13.4")
+        self.requires("pybind11/2.13.5")
         self.requires("nlohmann_json/3.11.3")
         self.requires("pybind11_json/0.2.14")
diff --git a/recipes/pybind11/conanfile.py b/recipes/pybind11/conanfile.py
index b27ba80725..7c8b141425 100644
--- a/recipes/pybind11/conanfile.py
+++ b/recipes/pybind11/conanfile.py
@@ -21,7 +21,7 @@
 
 class PyBind11Conan(ConanFile):
     name = "pybind11"
-    version = "2.13.4"
+    version = "2.13.5"
     description = "Seamless operability between C++11 and Python"
     topics = "pybind11", "python", "binding"
     homepage = "https://github.com/pybind/pybind11"
diff --git a/recipes/pybind11_json/all/conanfile.py b/recipes/pybind11_json/all/conanfile.py
index f18fd7ffe7..c594ba8c49 100644
--- a/recipes/pybind11_json/all/conanfile.py
+++ b/recipes/pybind11_json/all/conanfile.py
@@ -29,7 +29,7 @@ def package_id(self):
 
     def requirements(self):
         self.requires("nlohmann_json/3.11.3")
-        self.requires("pybind11/2.13.4")
+        self.requires("pybind11/2.13.5")
 
     def source(self):
         get(
diff --git a/tket/conanfile.py b/tket/conanfile.py
index 219b046b10..3c6f11dbc9 100644
--- a/tket/conanfile.py
+++ b/tket/conanfile.py
@@ -23,7 +23,7 @@
 
 class TketConan(ConanFile):
     name = "tket"
-    version = "1.3.19"
+    version = "1.3.20"
     package_type = "library"
     license = "Apache 2"
     homepage = "https://github.com/CQCL/tket"