diff --git a/.ci_support/linux_64_.yaml b/.ci_support/linux_64_.yaml
index ded8bde..cc5e8ac 100644
--- a/.ci_support/linux_64_.yaml
+++ b/.ci_support/linux_64_.yaml
@@ -1,5 +1,5 @@
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.ci_support/linux_aarch64_.yaml b/.ci_support/linux_aarch64_.yaml
index 9523835..cbf501e 100644
--- a/.ci_support/linux_aarch64_.yaml
+++ b/.ci_support/linux_aarch64_.yaml
@@ -1,7 +1,7 @@
 BUILD:
 - aarch64-conda_cos7-linux-gnu
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.ci_support/linux_ppc64le_.yaml b/.ci_support/linux_ppc64le_.yaml
index fd0467d..836e464 100644
--- a/.ci_support/linux_ppc64le_.yaml
+++ b/.ci_support/linux_ppc64le_.yaml
@@ -1,5 +1,5 @@
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.ci_support/migrations/assimp543.yaml b/.ci_support/migrations/assimp543.yaml
new file mode 100644
index 0000000..e0f94ce
--- /dev/null
+++ b/.ci_support/migrations/assimp543.yaml
@@ -0,0 +1,8 @@
+__migrator:
+  build_number: 1
+  commit_message: Rebuild for assimp 5.4.3
+  kind: version
+  migration_number: 1
+assimp:
+- 5.4.3
+migrator_ts: 1725100349.1005585
diff --git a/.ci_support/migrations/nlopt28.yaml b/.ci_support/migrations/nlopt28.yaml
deleted file mode 100644
index 510a44d..0000000
--- a/.ci_support/migrations/nlopt28.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
-__migrator:
-  build_number: 1
-  commit_message: Rebuild for nlopt 2.8
-  kind: version
-  migration_number: 1
-migrator_ts: 1725279582.425862
-nlopt:
-- '2.8'
diff --git a/.ci_support/osx_64_.yaml b/.ci_support/osx_64_.yaml
index 62de0e0..c074f3e 100644
--- a/.ci_support/osx_64_.yaml
+++ b/.ci_support/osx_64_.yaml
@@ -3,7 +3,7 @@ MACOSX_DEPLOYMENT_TARGET:
 MACOSX_SDK_VERSION:
 - '10.15'
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.ci_support/osx_arm64_.yaml b/.ci_support/osx_arm64_.yaml
index d3283a6..b7bf5f0 100644
--- a/.ci_support/osx_arm64_.yaml
+++ b/.ci_support/osx_arm64_.yaml
@@ -3,7 +3,7 @@ MACOSX_DEPLOYMENT_TARGET:
 MACOSX_SDK_VERSION:
 - '11.0'
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.ci_support/win_64_.yaml b/.ci_support/win_64_.yaml
index 862b782..fbd40a7 100644
--- a/.ci_support/win_64_.yaml
+++ b/.ci_support/win_64_.yaml
@@ -1,5 +1,5 @@
 assimp:
-- 5.4.2
+- 5.4.3
 bullet_cpp:
 - '3.25'
 c_compiler:
diff --git a/.scripts/build_steps.sh b/.scripts/build_steps.sh
index ba4b251..856f469 100755
--- a/.scripts/build_steps.sh
+++ b/.scripts/build_steps.sh
@@ -43,6 +43,8 @@ setup_conda_rc "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
 
 source run_conda_forge_build_setup
 
+
+
 # make the build number clobber
 make_build_number "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
 
diff --git a/.scripts/run_win_build.bat b/.scripts/run_win_build.bat
index 65650bf..a45c34f 100755
--- a/.scripts/run_win_build.bat
+++ b/.scripts/run_win_build.bat
@@ -24,7 +24,7 @@ set "CONDA_LIBMAMBA_SOLVER_NO_CHANNELS_FROM_INSTALLED=1"
 
 :: Provision the necessary dependencies to build the recipe later
 echo Installing dependencies
-mamba.exe install "python=3.10" pip mamba conda-build conda-forge-ci-setup=4 "conda-build>=24.1" -c conda-forge --strict-channel-priority --yes
+mamba.exe install pip mamba conda-build conda-forge-ci-setup=4 "conda-build>=24.1" -c conda-forge --strict-channel-priority --yes
 if !errorlevel! neq 0 exit /b !errorlevel!
 
 :: Set basic configuration
@@ -48,7 +48,7 @@ if NOT [%HOST_PLATFORM%] == [%BUILD_PLATFORM%] (
 )
 
 if NOT [%flow_run_id%] == [] (
-    set "EXTRA_CB_OPTIONS=%EXTRA_CB_OPTIONS% --extra-meta flow_run_id=%flow_run_id% remote_url=%remote_url% sha=%sha%"
+        set "EXTRA_CB_OPTIONS=%EXTRA_CB_OPTIONS% --extra-meta flow_run_id=%flow_run_id% remote_url=%remote_url% sha=%sha%"
 )
 
 call :end_group
diff --git a/build-locally.py b/build-locally.py
index 8ac9b84..6788aea 100755
--- a/build-locally.py
+++ b/build-locally.py
@@ -1,5 +1,5 @@
 #!/bin/sh
-"""exec' "python3" "$0" "$@" #"""  # fmt: off # fmt: on
+"""exec" "python3" "$0" "$@" #"""  # fmt: off # fmt: on
 #
 # This file has been generated by conda-smithy in order to build the recipe
 # locally.
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 004f132..dbe577e 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -12,7 +12,7 @@ source:
       - remove-opencl.patch
 
 build:
-  number: 4
+  number: 5
 
 outputs:
   - name: dartsim-cpp